1 /*
2 * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/ext/MatrixConcatFunction.java,v 1.4 2003/06/29 18:04:41 ssanders Exp $
3 * $Revision: 1.4 $
4 * $Date: 2003/06/29 18:04:41 $
5 *
6 * ====================================================================
7 *
8 * Copyright (C) 2000-2002 bob mcwhirter & James Strachan.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer.
17 *
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions, and the disclaimer that follows
20 * these conditions in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * 3. The name "Jaxen" must not be used to endorse or promote products
24 * derived from this software without prior written permission. For
25 * written permission, please contact license@jaxen.org.
26 *
27 * 4. Products derived from this software may not be called "Jaxen", nor
28 * may "Jaxen" appear in their name, without prior written permission
29 * from the Jaxen Project Management (pm@jaxen.org).
30 *
31 * In addition, we request (but do not require) that you include in the
32 * end-user documentation provided with the redistribution and/or in the
33 * software itself an acknowledgement equivalent to the following:
34 * "This product includes software developed by the
35 * Jaxen Project (http://www.jaxen.org/)."
36 * Alternatively, the acknowledgment may be graphical using the logos
37 * available at http://www.jaxen.org/
38 *
39 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
40 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
41 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
42 * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
43 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
45 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
46 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
47 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
48 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
49 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * ====================================================================
53 * This software consists of voluntary contributions made by many
54 * individuals on behalf of the Jaxen Project and was originally
55 * created by bob mcwhirter <bob@werken.com> and
56 * James Strachan <jstrachan@apache.org>. For more information on the
57 * Jaxen Project, please see <http://www.jaxen.org/>.
58 *
59 * $Id: MatrixConcatFunction.java,v 1.4 2003/06/29 18:04:41 ssanders Exp $
60 */
61
62 package org.jaxen.function.ext;
63
64 import java.util.ArrayList;
65 import java.util.Enumeration;
66 import java.util.Iterator;
67 import java.util.List;
68
69 import org.jaxen.Context;
70 import org.jaxen.Function;
71 import org.jaxen.Navigator;
72 import org.jaxen.function.StringFunction;
73
74 /*** <p><b>Extension Function</b> <code><i>boolean</i> matrix-concat(<i>nodeSet</i>,<i>nodeSet</i>,<i>nodeSet*</i>)</code>
75 *
76 * @author James Pereira (JPereira@CT.BBD.CO.ZA)
77 */
78
79 public class MatrixConcatFunction implements Function {
80
81 public Object call(Context context, List args) {
82 if ( args.size() >= 2 ) {
83 return evaluate(args, context.getNavigator());
84 }
85 return null;
86 }
87
88 public static Object evaluate(List list, Navigator nav) {
89 ArrayList matrix = new ArrayList();
90
91 Iterator argIter = list.iterator();
92
93 while (argIter.hasNext()) {
94 ArrayList v = new ArrayList();
95 Object obj = argIter.next();
96 if (obj instanceof List) {
97 List args = (List) obj;
98 for ( int i = 0, size = args.size(); i < size; i++ ) {
99 v.add( StringFunction.evaluate( args.get(i), nav ) );
100 }
101 }
102 else {
103 v.add( StringFunction.evaluate( obj, nav ) );
104 }
105 matrix.add(v);
106 }
107
108 ArrayList result = new ArrayList();
109 Enumeration elemList = new MatrixEnum( matrix );
110 while (elemList.hasMoreElements()) {
111 Object obj = elemList.nextElement();
112 if (obj instanceof List) {
113 StringBuffer text = new StringBuffer(127);
114 List args = (List) obj;
115 for (Iterator it = args.iterator(); it.hasNext(); ) {
116 text.append(it.next());
117 }
118 result.add( text.toString() );
119 }
120 else {
121 result.add( obj );
122 }
123 }
124 return result;
125 }
126
127 public static class MatrixEnum implements Enumeration {
128 private ArrayList m_source;
129 private int m_maxSize = 0;
130 private int m_currIdx = -1;
131
132 public MatrixEnum (ArrayList _source) {
133 m_source = _source;
134
135 for ( Iterator iter = m_source.iterator(); iter.hasNext(); ) {
136 ArrayList element = (ArrayList) iter.next();
137 int size = element.size();
138 if (size > m_maxSize) {
139 m_maxSize = size;
140 }
141 }
142 }
143
144 public MatrixEnum (ArrayList _source, int _maxSize) {
145 m_source = _source;
146 m_maxSize = _maxSize;
147 }
148
149 public boolean hasMoreElements() {
150 if ((m_maxSize != 0) && (++m_currIdx < m_maxSize)) {
151 return true;
152 }
153 else {
154 return false;
155 }
156 }
157
158 public Object nextElement() {
159 ArrayList result = new ArrayList();
160 for ( Iterator iter = m_source.iterator(); iter.hasNext(); ) {
161 ArrayList element = (ArrayList) iter.next();
162 int size = element.size();
163 if ( m_currIdx < size ) {
164 result.add( element.get( m_currIdx ) );
165 }
166 else {
167 if ( size > 0 ) {
168 result.add( element.get( size - 1 ) );
169 }
170 else {
171 // XXXX: what to do now?
172 result.add( "" );
173 }
174 }
175 }
176 return result;
177 }
178 }
179 }