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 2004-2007 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.openidex.search;
043:
044: import java.util.Iterator;
045: import java.util.NoSuchElementException;
046: import org.openide.loaders.DataObject;
047:
048: /**
049: *
050: * @author Marian Petras
051: */
052: class CompoundSearchIterator implements Iterator<DataObject> {
053:
054: /** */
055: private final SearchInfo[] elements;
056: /** */
057: private int elementIndex;
058: /** */
059: private Iterator<DataObject> elementIterator;
060: /** */
061: private DataObject nextObject;
062: /** */
063: private boolean upToDate;
064:
065: /**
066: * Creates a new instance of <code>CompoundSearchIterator</code>.
067: *
068: * @param elements elements of the compound iterator
069: * @exception java.lang.IllegalArgumentException
070: * if the argument is <code>null</code>
071: */
072: CompoundSearchIterator(SearchInfo[] elements) {
073: if (elements == null) {
074: throw new IllegalArgumentException();
075: }
076:
077: if (elements.length == 0) {
078: this .elements = null;
079: elementIndex = 0;
080: upToDate = true; //hasNext() returns always false
081: } else {
082: this .elements = elements;
083: elementIterator = elements[elementIndex = 0]
084: .objectsToSearch();
085: upToDate = false;
086: }
087: }
088:
089: /**
090: */
091: public boolean hasNext() {
092: if (!upToDate) {
093: update();
094: }
095: return (elements != null) && (elementIndex < elements.length);
096: }
097:
098: /**
099: */
100: public DataObject next() {
101: if (!hasNext()) {
102: throw new NoSuchElementException();
103: }
104:
105: upToDate = false;
106: return nextObject;
107: }
108:
109: /**
110: */
111: private void update() {
112: assert upToDate == false;
113:
114: while (!elementIterator.hasNext()) {
115: elements[elementIndex] = null;
116:
117: if (++elementIndex == elements.length) {
118: break;
119: }
120:
121: elementIterator = elements[elementIndex].objectsToSearch();
122: }
123:
124: if (elementIndex < elements.length) {
125: nextObject = elementIterator.next();
126: } else {
127: elementIterator = null;
128: nextObject = null;
129: }
130:
131: upToDate = true;
132: }
133:
134: /**
135: * @exception java.lang.UnsupportedOperationException
136: * always - this operation is not supported
137: */
138: public void remove() {
139: throw new UnsupportedOperationException();
140: }
141:
142: }
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