120 lines
4.4 KiB
Java
120 lines
4.4 KiB
Java
/* StringFunction.java --
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Copyright (C) 2004 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.xpath;
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import java.util.List;
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import javax.xml.namespace.QName;
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import org.w3c.dom.Node;
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/**
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* The <code>string function converts an object to a string as follows:
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* <ul>
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* <li>A node-set is converted to a string by returning the string-value of
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* the node in the node-set that is first in document order. If the node-set
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* is empty, an empty string is returned.</li>
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* <li>A number is converted to a string as follows
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* <ul>
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* <li>NaN is converted to the string NaN</li>
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* <li>positive zero is converted to the string 0</li>
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* <li>negative zero is converted to the string 0</li>
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* <li>positive infinity is converted to the string Infinity</li>
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* <li>negative infinity is converted to the string -Infinity</li>
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* <li>if the number is an integer, the number is represented in decimal
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* form as a Number with no decimal point and no leading zeros, preceded by
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* a minus sign (-) if the number is negative</li>
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* <li>otherwise, the number is represented in decimal form as a Number
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* including a decimal point with at least one digit before the decimal
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* point and at least one digit after the decimal point, preceded by a minus
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* sign (-) if the number is negative; there must be no leading zeros before
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* the decimal point apart possibly from the one required digit immediately
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* before the decimal point; beyond the one required digit after the decimal
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* point there must be as many, but only as many, more digits as are needed
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* to uniquely distinguish the number from all other IEEE 754 numeric
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* values.</li>
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* </ul>
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* </li>
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* <li>The boolean false value is converted to the string false. The boolean
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* true value is converted to the string true.</li>
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* <li>An object of a type other than the four basic types is converted to a
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* string in a way that is dependent on that type.</li>
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* </ul>
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* If the argument is omitted, it defaults to a node-set with the context
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* node as its only member.
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*
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* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
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*/
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final class StringFunction
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extends Expr
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{
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final Expr arg;
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StringFunction(List args)
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{
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this(args.size() > 0 ? (Expr) args.get(0) : null);
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}
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StringFunction(Expr arg)
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{
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this.arg = arg;
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}
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public Object evaluate(Node context, int pos, int len)
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{
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Object val = (arg == null) ? null : arg.evaluate(context, pos, len);
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return _string(context, val);
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}
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public Expr clone(Object context)
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{
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return new StringFunction((arg == null) ? null :
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arg.clone(context));
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}
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public boolean references(QName var)
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{
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return (arg == null) ? false : arg.references(var);
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}
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public String toString()
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{
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return (arg == null) ? "string()" : "string(" + arg + ")";
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}
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}
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