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    1   /*
    2    * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/ext/MatrixConcatFunction.java,v 1.5 2005/06/28 13:44:45 elharo Exp $
    3    * $Revision: 1.5 $
    4    * $Date: 2005/06/28 13:44:45 $
    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 1.5 2005/06/28 13:44:45 elharo 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 }