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.tax.dom;
043:
044: import java.util.Iterator;
045: import org.w3c.dom.*;
046: import org.netbeans.tax.*;
047:
048: /**
049: * NodeList taht filters out all unwrappable types.
050: *
051: *
052: * @author Petr Kuzel
053: */
054: class NodeListImpl implements NodeList {
055:
056: public static final NodeList EMPTY = new NodeList() {
057: public int getLength() {
058: return 0;
059: }
060:
061: public org.w3c.dom.Node item(int i) {
062: return null;
063: }
064:
065: public String toString() {
066: return "NodeListImpl.EMPTY";
067: }
068: };
069:
070: private final TreeObjectList peer;
071:
072: public NodeListImpl(TreeObjectList peer) {
073: this .peer = peer;
074: }
075:
076: /** The number of nodes in the list. The range of valid child node indices
077: * is 0 to <code>length-1</code> inclusive.
078: *
079: */
080: public int getLength() {
081: int i = 0;
082: Iterator it = peer.iterator();
083: while (it.hasNext()) {
084: TreeObject next = (TreeObject) it.next();
085: if (accept(next))
086: i++;
087: }
088: return i;
089: }
090:
091: /** Returns the <code>index</code>th item in the collection. If
092: * <code>index</code> is greater than or equal to the number of nodes in
093: * the list, this returns <code>null</code>.
094: * @param index Index into the collection.
095: * @return The node at the <code>index</code>th position in the
096: * <code>NodeList</code>, or <code>null</code> if that is not a valid
097: * index.
098: *
099: */
100: public Node item(int index) {
101: int i = 0;
102: Iterator it = peer.iterator();
103: while (it.hasNext()) {
104: TreeObject next = (TreeObject) it.next();
105: if (accept(next)) {
106: if (i == index) {
107: return Wrapper.wrap((TreeObject) peer.get(index));
108: } else {
109: i++;
110: }
111: }
112: }
113: return null;
114: }
115:
116: /**
117: * Supported types.
118: */
119: private boolean accept(TreeObject o) {
120: return o instanceof TreeText || o instanceof TreeElement;
121: }
122: }
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