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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

Showing the changes to java/pkg/com/sun/beans/decoder/JavaElementHandler.java (1 of 18352 files). Show all

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java/pkg/com/sun/beans/decoder/JavaElementHandler.java+151−0
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1+/*
2+ * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
3+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4+ *
5+ * This code is free software; you can redistribute it and/or modify it
6+ * under the terms of the GNU General Public License version 2 only, as
7+ * published by the Free Software Foundation. Oracle designates this
8+ * particular file as subject to the "Classpath" exception as provided
9+ * by Oracle in the LICENSE file that accompanied this code.
10+ *
11+ * This code is distributed in the hope that it will be useful, but WITHOUT
12+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14+ * version 2 for more details (a copy is included in the LICENSE file that
15+ * accompanied this code).
16+ *
17+ * You should have received a copy of the GNU General Public License version
18+ * 2 along with this work; if not, write to the Free Software Foundation,
19+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20+ *
21+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22+ * or visit www.oracle.com if you need additional information or have any
23+ * questions.
24+ */
25+package com.sun.beans.decoder;
26+
27+import java.beans.XMLDecoder;
28+
29+/**
30+ * This class is intended to handle <java> element.
31+ * Each element that appears in the body of this element
32+ * is evaluated in the context of the decoder itself.
33+ * Typically this outer context is used to retrieve the owner of the decoder,
34+ * which can be set before reading the archive.
35+ * <p>The following atributes are supported:
36+ * <dl>
37+ * <dt>version
38+ * <dd>the Java version (not supported)
39+ * <dt>class
40+ * <dd>the type of preferable parser (not supported)
41+ * <dt>id
42+ * <dd>the identifier of the variable that is intended to store the result
43+ * </dl>
44+ *
45+ * @see DocumentHandler#getOwner
46+ * @see DocumentHandler#setOwner
47+ * @since 1.7
48+ *
49+ * @author Sergey A. Malenkov
50+ */
51+final class JavaElementHandler extends ElementHandler {
52+ private Class<?> type;
53+ private ValueObject value;
54+
55+ /**
56+ * Parses attributes of the element.
57+ * The following atributes are supported:
58+ * <dl>
59+ * <dt>version
60+ * <dd>the Java version (not supported)
61+ * <dt>class
62+ * <dd>the type of preferable parser (not supported)
63+ * <dt>id
64+ * <dd>the identifier of the variable that is intended to store the result
65+ * </dl>
66+ *
67+ * @param name the attribute name
68+ * @param value the attribute value
69+ */
70+ @Override
71+ public void addAttribute(String name, String value) {
72+ if (name.equals("version")) { // NON-NLS: the attribute name
73+ // unsupported attribute
74+ } else if (name.equals("class")) { // NON-NLS: the attribute name
75+ // check class for owner
76+ this.type = getOwner().findClass(value);
77+ } else {
78+ super.addAttribute(name, value);
79+ }
80+ }
81+
82+ /**
83+ * Adds the argument to the list of readed objects.
84+ *
85+ * @param argument the value of the element that contained in this one
86+ */
87+ @Override
88+ protected void addArgument(Object argument) {
89+ getOwner().addObject(argument);
90+ }
91+
92+ /**
93+ * Tests whether the value of this element can be used
94+ * as an argument of the element that contained in this one.
95+ *
96+ * @return {@code true} if the value of this element should be used
97+ * as an argument of the element that contained in this one,
98+ * {@code false} otherwise
99+ */
100+ @Override
101+ protected boolean isArgument() {
102+ return false; // do not use owner as object
103+ }
104+
105+ /**
106+ * Returns the value of this element.
107+ *
108+ * @return the value of this element
109+ */
110+ @Override
111+ protected ValueObject getValueObject() {
112+ if (this.value == null) {
113+ this.value = ValueObjectImpl.create(getValue());
114+ }
115+ return this.value;
116+ }
117+
118+ /**
119+ * Returns the owner of the owner document handler
120+ * as a value of &lt;java&gt; element.
121+ *
122+ * @return the owner of the owner document handler
123+ */
124+ private Object getValue() {
125+ Object owner = getOwner().getOwner();
126+ if ((this.type == null) || isValid(owner)) {
127+ return owner;
128+ }
129+ if (owner instanceof XMLDecoder) {
130+ XMLDecoder decoder = (XMLDecoder) owner;
131+ owner = decoder.getOwner();
132+ if (isValid(owner)) {
133+ return owner;
134+ }
135+ }
136+ throw new IllegalStateException("Unexpected owner class: " + owner.getClass().getName());
137+ }
138+
139+ /**
140+ * Validates the owner of the &lt;java&gt; element.
141+ * The owner is valid if it is {@code null} or an instance
142+ * of the class specified by the {@code class} attribute.
143+ *
144+ * @param owner the owner of the &lt;java&gt; element
145+ * @return {@code true} if the {@code owner} is valid;
146+ * {@code false} otherwise
147+ */
148+ private boolean isValid(Object owner) {
149+ return (owner == null) || this.type.isInstance(owner);
150+ }
151+}