724 lines
22 KiB
Java
724 lines
22 KiB
Java
/* PipelineFactory.java --
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Copyright (C) 1999,2000,2001 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.xml.pipeline;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.OutputStreamWriter;
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import java.lang.reflect.Constructor;
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import java.util.StringTokenizer;
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import org.xml.sax.*;
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import org.xml.sax.ext.*;
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/**
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* This provides static factory methods for creating simple event pipelines.
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* These pipelines are specified by strings, suitable for passing on
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* command lines or embedding in element attributes. For example, one way
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* to write a pipeline that restores namespace syntax, validates (stopping
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* the pipeline on validity errors) and then writes valid data to standard
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* output is this: <pre>
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* nsfix | validate | write ( stdout )</pre>
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*
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* <p> In this syntax, the tokens are always separated by whitespace, and each
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* stage of the pipeline may optionally have a parameter (which can be a
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* pipeline) in parentheses. Interior stages are called filters, and the
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* rightmost end of a pipeline is called a terminus.
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*
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* <p> Stages are usually implemented by a single class, which may not be
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* able to act as both a filter and a terminus; but any terminus can be
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* automatically turned into a filter, through use of a {@link TeeConsumer}.
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* The stage identifiers are either class names, or are one of the following
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* short identifiers built into this class. (Most of these identifiers are
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* no more than aliases for classes.) The built-in identifiers include:</p>
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<table border="1" cellpadding="3" cellspacing="0">
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<tr bgcolor="#ccccff" class="TableHeadingColor">
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<th align="center" width="5%">Stage</th>
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<th align="center" width="9%">Parameter</th>
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<th align="center" width="1%">Terminus</th>
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<th align="center">Description</th>
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</tr>
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<tr valign="top" align="center">
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<td><a href="../dom/Consumer.html">dom</a></td>
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<td><em>none</em></td>
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<td> yes </td>
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<td align="left"> Applications code can access a DOM Document built
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from the input event stream. When used as a filter, this buffers
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data up to an <em>endDocument</em> call, and then uses a DOM parser
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to report everything that has been recorded (which can easily be
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less than what was reported to it). </td>
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</tr>
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<tr valign="top" align="center">
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<td><a href="NSFilter.html">nsfix</a></td>
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<td><em>none</em></td>
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<td>no</td>
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<td align="left">This stage ensures that the XML element and attribute
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names in its output use namespace prefixes and declarations correctly.
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That is, so that they match the "Namespace plus LocalName" naming data
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with which each XML element and attribute is already associated. </td>
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</tr>
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<tr valign="top" align="center">
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<td><a href="EventFilter.html">null</a></td>
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<td><em>none</em></td>
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<td>yes</td>
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<td align="left">This stage ignores all input event data.</td>
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</tr>
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<tr valign="top" align="center">
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<td><a href="CallFilter.html">server</a></td>
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<td><em>required</em><br> server URL </td>
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<td>no</td>
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<td align="left">Sends its input as XML request to a remote server,
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normally a web application server using the HTTP or HTTPS protocols.
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The output of this stage is the parsed response from that server.</td>
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</tr>
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<tr valign="top" align="center">
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<td><a href="TeeConsumer.html">tee</a></td>
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<td><em>required</em><br> first pipeline</td>
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<td>no</td>
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<td align="left">This sends its events down two paths; its parameter
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is a pipeline descriptor for the first path, and the second path
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is the output of this stage.</td>
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</tr>
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<tr valign="top" align="center">
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<td><a href="ValidationConsumer.html">validate</a></td>
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<td><em>none</em></td>
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<td>yes</td>
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<td align="left">This checks for validity errors, and reports them
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through its error handler. The input must include declaration events
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and some lexical events. </td>
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</tr>
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<tr valign="top" align="center">
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<td><a href="WellFormednessFilter.html">wf</a></td>
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<td><em>none</em></td>
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<td>yes</td>
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<td align="left"> This class provides some basic "well formedness"
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tests on the input event stream, and reports a fatal error if any
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of them fail. One example: start/end calls for elements must match.
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No SAX parser is permitted to produce malformed output, but other
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components can easily do so.</td>
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</tr>
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<tr valign="top" align="center">
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<td>write</td>
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<td><em>required</em><br> "stdout", "stderr", or filename</td>
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<td>yes</td>
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<td align="left"> Writes its input to the specified output, as pretty
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printed XML text encoded using UTF-8. Input events must be well
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formed and "namespace fixed", else the output won't be XML (or possibly
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namespace) conformant. The symbolic names represent
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<em>System.out</em> and <em>System.err</em> respectively; names must
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correspond to files which don't yet exist.</td>
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</tr>
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<tr valign="top" align="center">
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<td>xhtml</td>
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<td><em>required</em><br> "stdout", "stderr", or filename</td>
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<td>yes</td>
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<td align="left"> Like <em>write</em> (above), except that XHTML rules
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are followed. The XHTML 1.0 Transitional document type is declared,
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and only ASCII characters are written (for interoperability). Other
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characters are written as entity or character references; the text is
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pretty printed.</td>
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</tr>
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<tr valign="top" align="center">
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<td><a href="XIncludeFilter.html">xinclude</a></td>
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<td><em>none</em></td>
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<td>no</td>
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<td align="left">This stage handles XInclude processing.
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This is like entity inclusion, except that the included content
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is declared in-line rather than in the DTD at the beginning of
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a document.
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</td>
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</tr>
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<tr valign="top" align="center">
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<td><a href="XsltFilter.html">xslt</a></td>
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<td><em>required</em><br> XSLT stylesheet URI</td>
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<td>no</td>
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<td align="left">This stage handles XSLT transformation
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according to a stylesheet.
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The implementation of the transformation may not actually
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stream data, although if such an XSLT engine is in use
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then that can happen.
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</td>
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</tr>
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</table>
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* <p> Note that {@link EventFilter#bind} can automatically eliminate
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* some filters by setting SAX2 parser features appropriately. This means
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* that you can routinely put filters like "nsfix", "validate", or "wf" at the
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* front of a pipeline (for components that need inputs conditioned to match
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* that level of correctness), and know that it won't actually be used unless
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* it's absolutely necessary.
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*
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* @author David Brownell
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*/
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public class PipelineFactory
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{
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/**
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* Creates a simple pipeline according to the description string passed in.
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*/
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public static EventConsumer createPipeline (String description)
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throws IOException
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{
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return createPipeline (description, null);
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}
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/**
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* Extends an existing pipeline by prepending the filter pipeline to the
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* specified consumer. Some pipelines need more customization than can
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* be done through this simplified syntax. When they are set up with
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* direct API calls, use this method to merge more complex pipeline
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* segments with easily configured ones.
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*/
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public static EventConsumer createPipeline (
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String description,
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EventConsumer next
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) throws IOException
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{
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// tokens are (for now) what's separated by whitespace;
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// very easy to parse, but IDs never have spaces.
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StringTokenizer tokenizer;
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String tokens [];
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tokenizer = new StringTokenizer (description);
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tokens = new String [tokenizer.countTokens ()];
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for (int i = 0; i < tokens.length; i++)
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tokens [i] = tokenizer.nextToken ();
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PipelineFactory factory = new PipelineFactory ();
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Pipeline pipeline = factory.parsePipeline (tokens, next);
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return pipeline.createPipeline ();
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}
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private PipelineFactory () { /* NYET */ }
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/**
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* Extends an existing pipeline by prepending a pre-tokenized filter
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* pipeline to the specified consumer. Tokens are class names (or the
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* predefined aliases) left and right parenthesis, and the vertical bar.
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*/
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public static EventConsumer createPipeline (
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String tokens [],
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EventConsumer next
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) throws IOException
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{
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PipelineFactory factory = new PipelineFactory ();
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Pipeline pipeline = factory.parsePipeline (tokens, next);
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return pipeline.createPipeline ();
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}
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private String tokens [];
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private int index;
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private Pipeline parsePipeline (String toks [], EventConsumer next)
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{
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tokens = toks;
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index = 0;
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Pipeline retval = parsePipeline (next);
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if (index != toks.length)
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throw new ArrayIndexOutOfBoundsException (
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"extra token: " + tokens [index]);
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return retval;
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}
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// pipeline ::= stage | stage '|' pipeline
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private Pipeline parsePipeline (EventConsumer next)
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{
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Pipeline retval = new Pipeline (parseStage ());
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// minimal pipelines: "stage" and "... | id"
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if (index > (tokens.length - 2)
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|| !"|".equals (tokens [index])
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) {
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retval.next = next;
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return retval;
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}
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index++;
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retval.rest = parsePipeline (next);
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return retval;
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}
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// stage ::= id | id '(' pipeline ')'
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private Stage parseStage ()
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{
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Stage retval = new Stage (tokens [index++]);
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// minimal stages: "id" and "id ( id )"
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if (index > (tokens.length - 2)
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|| !"(".equals (tokens [index]) /*)*/
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)
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return retval;
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index++;
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retval.param = parsePipeline (null);
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if (index >= tokens.length)
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throw new ArrayIndexOutOfBoundsException (
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"missing right paren");
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if (/*(*/ !")".equals (tokens [index++]))
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throw new ArrayIndexOutOfBoundsException (
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"required right paren, not: " + tokens [index - 1]);
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return retval;
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}
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//
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// these classes obey the conventions for constructors, so they're
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// only built in to this table of shortnames
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//
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// - filter (one or two types of arglist)
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// * last constructor is 'next' element
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// * optional (first) string parameter
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//
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// - terminus (one or types of arglist)
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// * optional (only) string parameter
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//
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// terminus stages are transformed into filters if needed, by
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// creating a "tee". filter stages aren't turned to terminus
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// stages though; either eliminate such stages, or add some
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// terminus explicitly.
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//
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private static final String builtinStages [][] = {
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{ "dom", "gnu.xml.dom.Consumer" },
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{ "nsfix", "gnu.xml.pipeline.NSFilter" },
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{ "null", "gnu.xml.pipeline.EventFilter" },
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{ "server", "gnu.xml.pipeline.CallFilter" },
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{ "tee", "gnu.xml.pipeline.TeeConsumer" },
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{ "validate", "gnu.xml.pipeline.ValidationConsumer" },
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{ "wf", "gnu.xml.pipeline.WellFormednessFilter" },
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{ "xinclude", "gnu.xml.pipeline.XIncludeFilter" },
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{ "xslt", "gnu.xml.pipeline.XsltFilter" },
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// XXX want: option for validate, to preload external part of a DTD
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// xhtml, write ... nyet generic-ready
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};
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private static class Stage
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{
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String id;
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Pipeline param;
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Stage (String name)
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{ id = name; }
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public String toString ()
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{
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if (param == null)
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return id;
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return id + " ( " + param + " )";
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}
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private void fail (String message)
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throws IOException
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{
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throw new IOException ("in '" + id
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+ "' stage of pipeline, " + message);
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}
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EventConsumer createStage (EventConsumer next)
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throws IOException
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{
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String name = id;
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// most builtins are just class aliases
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for (int i = 0; i < builtinStages.length; i++) {
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if (id.equals (builtinStages [i][0])) {
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name = builtinStages [i][1];
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break;
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}
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}
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// Save output as XML or XHTML text
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if ("write".equals (name) || "xhtml".equals (name)) {
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String filename;
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boolean isXhtml = "xhtml".equals (name);
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OutputStream out = null;
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TextConsumer consumer;
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if (param == null)
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fail ("parameter is required");
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filename = param.toString ();
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if ("stdout".equals (filename))
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out = System.out;
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else if ("stderr".equals (filename))
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out = System.err;
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else {
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File f = new File (filename);
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/*
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if (!f.isAbsolute ())
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fail ("require absolute file paths");
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*/
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if (f.exists ())
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fail ("file already exists: " + f.getName ());
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// XXX this races against the existence test
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out = new FileOutputStream (f);
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}
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if (!isXhtml)
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consumer = new TextConsumer (out);
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else
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consumer = new TextConsumer (
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new OutputStreamWriter (out, "8859_1"),
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true);
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consumer.setPrettyPrinting (true);
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if (next == null)
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return consumer;
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return new TeeConsumer (consumer, next);
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} else {
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//
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// Here go all the builtins that are just aliases for
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// classes, and all stage IDs that started out as such
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// class names. The following logic relies on several
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// documented conventions for constructor invocation.
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//
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String msg = null;
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try {
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Class klass = Class.forName (name);
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Class argTypes [] = null;
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Constructor constructor = null;
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boolean filter = false;
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Object params [] = null;
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Object obj = null;
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// do we need a filter stage?
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if (next != null) {
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// "next" consumer is always passed, with
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// or without the optional string param
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if (param == null) {
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argTypes = new Class [1];
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argTypes [0] = EventConsumer.class;
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params = new Object [1];
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params [0] = next;
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msg = "no-param filter";
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} else {
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argTypes = new Class [2];
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argTypes [0] = String.class;
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argTypes [1] = EventConsumer.class;
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params = new Object [2];
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params [0] = param.toString ();
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params [1] = next;
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msg = "one-param filter";
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}
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|
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try {
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constructor = klass.getConstructor (argTypes);
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} catch (NoSuchMethodException e) {
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// try creating a filter from a
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// terminus and a tee
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filter = true;
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msg += " built from ";
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}
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}
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// build from a terminus stage, with or
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// without the optional string param
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if (constructor == null) {
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String tmp;
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if (param == null) {
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argTypes = new Class [0];
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params = new Object [0];
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tmp = "no-param terminus";
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} else {
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argTypes = new Class [1];
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argTypes [0] = String.class;
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params = new Object [1];
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params [0] = param.toString ();
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tmp = "one-param terminus";
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}
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if (msg == null)
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msg = tmp;
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else
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msg += tmp;
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constructor = klass.getConstructor (argTypes);
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// NOT creating terminus by dead-ending
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// filters ... users should think about
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// that one, something's likely wrong
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}
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obj = constructor.newInstance (params);
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// return EventConsumers directly, perhaps after
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// turning them into a filter
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if (obj instanceof EventConsumer) {
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if (filter)
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return new TeeConsumer ((EventConsumer) obj, next);
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return (EventConsumer) obj;
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}
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// if it's not a handler, it's an error
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// we can wrap handlers in a filter
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EventFilter retval = new EventFilter ();
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boolean updated = false;
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if (obj instanceof ContentHandler) {
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retval.setContentHandler ((ContentHandler) obj);
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updated = true;
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}
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if (obj instanceof DTDHandler) {
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retval.setDTDHandler ((DTDHandler) obj);
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updated = true;
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}
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if (obj instanceof LexicalHandler) {
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retval.setProperty (
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EventFilter.PROPERTY_URI + "lexical-handler",
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obj);
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updated = true;
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}
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if (obj instanceof DeclHandler) {
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retval.setProperty (
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EventFilter.PROPERTY_URI + "declaration-handler",
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obj);
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updated = true;
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}
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if (!updated)
|
|
fail ("class is neither Consumer nor Handler");
|
|
|
|
if (filter)
|
|
return new TeeConsumer (retval, next);
|
|
return retval;
|
|
|
|
} catch (IOException e) {
|
|
throw e;
|
|
|
|
} catch (NoSuchMethodException e) {
|
|
fail (name + " constructor missing -- " + msg);
|
|
|
|
} catch (ClassNotFoundException e) {
|
|
fail (name + " class not found");
|
|
|
|
} catch (Exception e) {
|
|
// e.printStackTrace ();
|
|
fail ("stage not available: " + e.getMessage ());
|
|
}
|
|
}
|
|
// NOTREACHED
|
|
return null;
|
|
}
|
|
}
|
|
|
|
private static class Pipeline
|
|
{
|
|
Stage stage;
|
|
|
|
// rest may be null
|
|
Pipeline rest;
|
|
EventConsumer next;
|
|
|
|
Pipeline (Stage s)
|
|
{ stage = s; }
|
|
|
|
public String toString ()
|
|
{
|
|
if (rest == null && next == null)
|
|
return stage.toString ();
|
|
if (rest != null)
|
|
return stage + " | " + rest;
|
|
throw new IllegalArgumentException ("next");
|
|
}
|
|
|
|
EventConsumer createPipeline ()
|
|
throws IOException
|
|
{
|
|
if (next == null) {
|
|
if (rest == null)
|
|
next = stage.createStage (null);
|
|
else
|
|
next = stage.createStage (rest.createPipeline ());
|
|
}
|
|
return next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
public static void main (String argv [])
|
|
{
|
|
try {
|
|
// three basic terminus cases
|
|
createPipeline ("null");
|
|
createPipeline ("validate");
|
|
createPipeline ("write ( stdout )");
|
|
|
|
// four basic filters
|
|
createPipeline ("nsfix | write ( stderr )");
|
|
createPipeline ("wf | null");
|
|
createPipeline ("null | null");
|
|
createPipeline (
|
|
"call ( http://www.example.com/services/xml-1a ) | xhtml ( stdout )");
|
|
|
|
// tee junctions
|
|
createPipeline ("tee ( validate ) | write ( stdout )");
|
|
createPipeline ("tee ( nsfix | write ( stdout ) ) | validate");
|
|
|
|
// longer pipeline
|
|
createPipeline ("nsfix | tee ( validate ) | write ( stdout )");
|
|
createPipeline (
|
|
"null | wf | nsfix | tee ( validate ) | write ( stdout )");
|
|
|
|
// try some parsing error cases
|
|
try {
|
|
createPipeline ("null ("); // extra token '('
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
|
|
try {
|
|
createPipeline ("nsfix |"); // extra token '|'
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
|
|
try {
|
|
createPipeline ("xhtml ( foo"); // missing right paren
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
|
|
try {
|
|
createPipeline ("xhtml ( foo bar"); // required right paren
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
|
|
try {
|
|
createPipeline ("tee ( nsfix | validate");// missing right paren
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
|
|
// try some construction error cases
|
|
|
|
try {
|
|
createPipeline ("call"); // missing param
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
try {
|
|
createPipeline ("call ( foobar )"); // broken param
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
try {
|
|
createPipeline ("nsfix ( foobar )"); // illegal param
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
try {
|
|
createPipeline ("null ( foobar )"); // illegal param
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
try {
|
|
createPipeline ("wf ( foobar )"); // illegal param
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
try {
|
|
createPipeline ("xhtml ( foobar.html )");
|
|
new File ("foobar.html").delete ();
|
|
// now supported
|
|
} catch (Exception e) {
|
|
System.err.println ("** err: " + e.getMessage ()); }
|
|
try {
|
|
createPipeline ("xhtml"); // missing param
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
try {
|
|
createPipeline ("write ( stdout ) | null"); // nonterminal
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
try {
|
|
createPipeline ("validate | null");
|
|
// now supported
|
|
} catch (Exception e) {
|
|
System.err.println ("** err: " + e.getMessage ()); }
|
|
try {
|
|
createPipeline ("validate ( foo )"); // illegal param
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
try {
|
|
createPipeline ("tee"); // missing param
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
try {
|
|
// only builtins so far
|
|
createPipeline ("com.example.xml.FilterClass");
|
|
System.err.println ("** didn't report error");
|
|
} catch (Exception e) {
|
|
System.err.println ("== err: " + e.getMessage ()); }
|
|
|
|
} catch (Exception e) {
|
|
e.printStackTrace ();
|
|
}
|
|
}
|
|
/**/
|
|
|
|
}
|