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	/*
	* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code 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
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	package com.sun.beans.decoder;

	import java.beans.XMLDecoder;

	/**
	* This class is intended to handle <java> element.
	* Each element that appears in the body of this element
	* is evaluated in the context of the decoder itself.
	* Typically this outer context is used to retrieve the owner of the decoder,
	* which can be set before reading the archive.
	* <p>The following attributes are supported:
	* <dl>
	* <dt>version
	* <dd>the Java version (not supported)
	* <dt>class
	* <dd>the type of preferable parser (not supported)
	* <dt>id
	* <dd>the identifier of the variable that is intended to store the result
	* </dl>
	*
	* @see DocumentHandler#getOwner
	* @see DocumentHandler#setOwner
	* @since 1.7
	*
	* @author Sergey A. Malenkov
	*/
	final class JavaElementHandler extends ElementHandler {
	private Class<?> type;
	private ValueObject value;

	/**
	* Parses attributes of the element.
	* The following attributes are supported:
	* <dl>
	* <dt>version
	* <dd>the Java version (not supported)
	* <dt>class
	* <dd>the type of preferable parser (not supported)
	* <dt>id
	* <dd>the identifier of the variable that is intended to store the result
	* </dl>
	*
	* @param name the attribute name
	* @param value the attribute value
	*/
	@Override
	public void addAttribute(String name, String value) {
	if (name.equals("version")) { // NON-NLS: the attribute name
	// unsupported attribute
	} else if (name.equals("class")) { // NON-NLS: the attribute name
	// check class for owner
	this.type = getOwner().findClass(value);
	} else {
	super.addAttribute(name, value);
	}
	}

	/**
	* Adds the argument to the list of readed objects.
	*
	* @param argument the value of the element that contained in this one
	*/
	@Override
	protected void addArgument(Object argument) {
	getOwner().addObject(argument);
	}

	/**
	* Tests whether the value of this element can be used
	* as an argument of the element that contained in this one.
	*
	* @return {@code true} if the value of this element should be used
	* as an argument of the element that contained in this one,
	* {@code false} otherwise
	*/
	@Override
	protected boolean isArgument() {
	return false; // do not use owner as object
	}

	/**
	* Returns the value of this element.
	*
	* @return the value of this element
	*/
	@Override
	protected ValueObject getValueObject() {
	if (this.value == null) {
	this.value = ValueObjectImpl.create(getValue());
	}
	return this.value;
	}

	/**
	* Returns the owner of the owner document handler
	* as a value of <java> element.
	*
	* @return the owner of the owner document handler
	*/
	private Object getValue() {
	Object owner = getOwner().getOwner();
	if ((this.type == null) \|\| isValid(owner)) {
	return owner;
	}
	if (owner instanceof XMLDecoder) {
	XMLDecoder decoder = (XMLDecoder) owner;
	owner = decoder.getOwner();
	if (isValid(owner)) {
	return owner;
	}
	}
	throw new IllegalStateException("Unexpected owner class: " + owner.getClass().getName());
	}

	/**
	* Validates the owner of the <java> element.
	* The owner is valid if it is {@code null} or an instance
	* of the class specified by the {@code class} attribute.
	*
	* @param owner the owner of the <java> element
	* @return {@code true} if the {@code owner} is valid;
	* {@code false} otherwise
	*/
	private boolean isValid(Object owner) {
	return (owner == null) \|\| this.type.isInstance(owner);
	}
	}

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