001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: *
026: * The Original Software is NetBeans. The Initial Developer of the Original
027: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
028: * Microsystems, Inc. All Rights Reserved.
029: *
030: * If you wish your version of this file to be governed by only the CDDL
031: * or only the GPL Version 2, indicate your decision by adding
032: * "[Contributor] elects to include this software in this distribution
033: * under the [CDDL or GPL Version 2] license." If you do not indicate a
034: * single choice of license, a recipient has the option to distribute
035: * your version of this file under either the CDDL, the GPL Version 2 or
036: * to extend the choice of license to its licensees as provided above.
037: * However, if you add GPL Version 2 code and therefore, elected the GPL
038: * Version 2 license, then the option applies only if the new code is
039: * made subject to such option by the copyright holder.
040: */
041:
042: package org.netbeans.modules.xml.schema.model;
043:
044: import java.util.*;
045:
046: /**
047: *
048: * @author Todd Fast, todd.fast@sun.com
049: */
050: public class SchemaComponentReference<T extends SchemaComponent>
051: extends Object {
052: /**
053: *
054: *
055: */
056: private SchemaComponentReference(T component) {
057: super ();
058:
059: if (component == null) {
060: throw new IllegalArgumentException(
061: "Parameter \"component\" cannot be null");
062: }
063:
064: this .component = component;
065: }
066:
067: /**
068: *
069: *
070: */
071: public boolean equals(Object other) {
072: if (!(other instanceof SchemaComponentReference))
073: return false;
074:
075: return this .get() == ((SchemaComponentReference) other).get();
076: }
077:
078: /**
079: *
080: *
081: */
082: public int hashCode() {
083: // TODO: What's a reasonable hash algorithm here to avoid collision
084: // with the hashCode of the referenced object? We want the reference's
085: // hashcode to be based on the referent, but different.
086: return get().hashCode();
087: }
088:
089: /**
090: *
091: *
092: */
093: public String toString() {
094: return getClass().getName() + "<" + get().getClass().getName()
095: + ">";
096: }
097:
098: /**
099: *
100: *
101: */
102: public T get() {
103: return component;
104: }
105:
106: /**
107: *
108: *
109: */
110: public static <C extends SchemaComponent> SchemaComponentReference<C> create(
111: C component) {
112: SchemaComponentReference<C> reference = new SchemaComponentReference<C>(
113: component);
114:
115: return reference;
116: }
117:
118: ////////////////////////////////////////////////////////////////////////////
119: // Instance members
120: ////////////////////////////////////////////////////////////////////////////
121:
122: private T component;
123: }
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