| /* |
| * Copyright (c) 2008, 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 atributes 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 atributes 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); |
| } |
| } |