gcc/libjava/gnu/java/beans/decoder/MethodFinder.java
Michael Koch 6ca84a804a [multiple changes]
2005-02-19  Michael Koch  <konqueror@gmx.de>

	* Makefile.am: Added new files in gnu/java/beans and
	java/beans/XMLDecoder.java.
	* Makefile.in: Regenerated.

2005-02-19  Robert Schuster  <thebohemian@gmx.net>

	* gnu/java/beans/decoder/GrowableArrayContext.java: Fixed
	assignment behavior by using java.lang.reflect.Array.set()
	directly.

2005-02-19  Dalibor Topic  <robilad@kaffe.org>

	* gnu/java/beans/EmptyBeanInfo.java,
	gnu/java/beans/info/ComponentBeanInfo.java:
	Removed unused files.

2005-02-19  Robert Schuster <thebohemian@gmx.net>

	* gnu/java/beans/DummyAppletStub.java: Add dummy implementation
	of AppletStub for java.beans.Beans.instantiate.
	* gnu/java/beans/DummyAppletContext.java: Add dummy implementation
	of AppletContext.
	* java/beans/Beans: Added 1.4 functionality, fixed user documentation
	to be conformant with Javadoc guidelines.
	(instantiate): Added two more overloaded variants, reworked user
	documentation, fixed exception behavior, fixed behavior when
	deserializing null.

2005-02-19  Mark Wielaard  <mark@klomp.org>

	* gnu/java/beans/decoder/DummyHandler.java: Add return statements for
	failing methods.
	* gnu/java/beans/decoder/DummyContext.java: Likewise.

2005-02-19  Robert Schuster  <theBohemian@gmx.net>

	* gnu/java/beans/decoder/AbstractContext.java,
	gnu/java/beans/decoder/AbstractCreatableContext.java,
	gnu/java/beans/decoder/AbstractElementHandler.java,
	gnu/java/beans/decoder/AbstractObjectContext.java,
	gnu/java/beans/decoder/ArrayContext.java,
	gnu/java/beans/decoder/ArrayHandler.java,
	gnu/java/beans/decoder/AssemblyException.java,
	gnu/java/beans/decoder/BooleanHandler.java,
	gnu/java/beans/decoder/ByteHandler.java,
	gnu/java/beans/decoder/CharHandler.java,
	gnu/java/beans/decoder/ClassHandler.java,
	gnu/java/beans/decoder/ConstructorContext.java,
	gnu/java/beans/decoder/Context.java,
	gnu/java/beans/decoder/DecoderContext.java,
	gnu/java/beans/decoder/DefaultExceptionListener.java,
	gnu/java/beans/decoder/DoubleHandler.java,
	gnu/java/beans/decoder/DummyContext.java,
	gnu/java/beans/decoder/DummyHandler.java,
	gnu/java/beans/decoder/ElementHandler.java,
	gnu/java/beans/decoder/FloatHandler.java,
	gnu/java/beans/decoder/GrowableArrayContext.java,
	gnu/java/beans/decoder/IndexContext.java,
	gnu/java/beans/decoder/IntHandler.java,
	gnu/java/beans/decoder/JavaHandler.java,
	gnu/java/beans/decoder/LongHandler.java,
	gnu/java/beans/decoder/MethodContext.java,
	gnu/java/beans/decoder/MethodFinder.java,
	gnu/java/beans/decoder/NullHandler.java,
	gnu/java/beans/decoder/ObjectContext.java,
	gnu/java/beans/decoder/ObjectHandler.java,
	gnu/java/beans/decoder/PersistenceParser.java,
	gnu/java/beans/decoder/PropertyContext.java,
	gnu/java/beans/decoder/ShortHandler.java,
	gnu/java/beans/decoder/SimpleHandler.java,
	gnu/java/beans/decoder/StaticMethodContext.java,
	gnu/java/beans/decoder/StringHandler.java,
	gnu/java/beans/decoder/VoidHandler.java: New class
	implementing java.beans.XMLDecoder decoding functionality.
	* java/beans/XMLDecoder.java: New class.

From-SVN: r95287
2005-02-19 18:47:29 +00:00

178 lines
5.6 KiB
Java

/* gnu.java.beans.decoder.MethodFinder
Copyright (C) 2004 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.
Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module. An independent module is a module which is not derived from
or based on this library. If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this
exception statement from your version. */
package gnu.java.beans.decoder;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.HashMap;
class MethodFinder
{
/** Provides a mapping between a wrapper class and its corresponding primitive's type. */
private static HashMap typeMapping = new HashMap();
static {
typeMapping.put(Byte.class, Byte.TYPE);
typeMapping.put(Short.class, Short.TYPE);
typeMapping.put(Integer.class, Integer.TYPE);
typeMapping.put(Long.class, Long.TYPE);
typeMapping.put(Float.class, Float.TYPE);
typeMapping.put(Double.class, Double.TYPE);
typeMapping.put(Character.class, Character.TYPE);
typeMapping.put(Boolean.class, Boolean.TYPE);
}
private MethodFinder()
{
}
/** Searches a Method which can accept the given arguments.
*
* @param klass
* @param name
* @param arguments
* @return
* @throws NoSuchMethodException
*/
static Method getMethod(Class klass, String name, Object[] arguments)
throws NoSuchMethodException
{
// prepares array containing the types of the arguments
Class[] argumentTypes = getArgumentTypes(arguments);
Method[] methods = klass.getMethods();
// iterates over all public methods
for (int i = 0; i < methods.length; i++)
{
if (methods[i].getName().equals(name))
{
if (matchingArgumentTypes(methods[i].getParameterTypes(),
argumentTypes))
return methods[i];
}
}
throw new NoSuchMethodException(
"Could not find a matching method named "
+ name
+ "() in class "
+ klass);
}
static Constructor getConstructor(Class klass, Object[] arguments)
throws NoSuchMethodException
{
Class[] argumentTypes = getArgumentTypes(arguments);
Constructor[] constructors = klass.getConstructors();
// iterates over all public methods
for (int i = 0; i < constructors.length; i++)
{
if (matchingArgumentTypes(constructors[i].getParameterTypes(),
argumentTypes))
return constructors[i];
}
throw new NoSuchMethodException(
"Could not find a matching constructor in class " + klass);
}
/** Transforms an array of argument objects into an array of argument types.
* For each argument being null the argument is null, too. An argument type
* being null means: Accepts everything (although this can be ambigous).
*
* @param arguments
* @return
*/
private static Class[] getArgumentTypes(Object[] arguments)
{
if (arguments == null)
return new Class[0];
// prepares array containing the types of the arguments
Class[] argumentTypes = new Class[arguments.length];
for (int i = 0; i < arguments.length; i++)
argumentTypes[i] =
(arguments[i] == null) ? null : arguments[i].getClass();
return argumentTypes;
}
/** Tests whether the argument types supplied to the method argument types
* are assignable. In addition to the assignment specifications this method
* handles the primitive's wrapper classes as if they were of their
* primitive type (e.g Boolean.class equals Boolean.TYPE).
* When a supplied argument type is null it is assumed that no argument
* object was supplied for it and the test for this particular parameter will
* pass.
*
* @param methodArgTypes
* @param suppliedArgTypes
* @return
*/
private static boolean matchingArgumentTypes(
Class[] methodArgTypes,
Class[] suppliedArgTypes)
{
if (methodArgTypes.length != suppliedArgTypes.length)
return false;
for (int i = 0; i < methodArgTypes.length; i++)
{
if (suppliedArgTypes[i] == null)
{
// by definition a non-existant argument type (null) can be converted to everything
continue;
}
else if (typeMapping.containsKey(suppliedArgTypes[i]))
{
Class primitiveType =
(Class) typeMapping.get(suppliedArgTypes[i]);
if (!(methodArgTypes[i].isAssignableFrom(suppliedArgTypes[i])
|| methodArgTypes[i].isAssignableFrom(primitiveType)))
return false;
}
else if (!methodArgTypes[i].isAssignableFrom(suppliedArgTypes[i]))
return false;
}
return true;
}
}