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    1   /*
    2    * Copyright 2002,2004 The Apache Software Foundation.
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  package org.apache.commons.jelly.impl;
    17
    18  import java.util.ArrayList;
    19  import java.util.Iterator;
    20  import java.util.List;
    21
    22  import org.apache.commons.jelly.JellyContext;
    23  import org.apache.commons.jelly.JellyException;
    24  import org.apache.commons.jelly.JellyTagException;
    25  import org.apache.commons.jelly.Script;
    26  import org.apache.commons.jelly.XMLOutput;
    27
    28  /*** <p><code>ScriptBlock</code> a block of scripts.</p>
    29    *
    30    * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
    31    * @version $Revision: 155420 $
    32    */
    33  public class ScriptBlock implements Script {
    34
    35      /*** The list of scripts */
    36      private List list = new ArrayList();
    37
    38      /***
    39       * Create a new instance.
    40       */
    41      public ScriptBlock() {
    42      }
    43
    44      /***
    45       * @see Object#toString()
    46       */
    47      public String toString() {
    48          return super.toString() + "[scripts=" + list + "]";
    49      }
    50
    51      /*** Add a new script to the end of this block */
    52      public void addScript(Script script) {
    53          list.add(script);
    54      }
    55
    56      /*** Removes a script from this block */
    57      public void removeScript(Script script) {
    58          list.remove(script);
    59      }
    60
    61      /***
    62       * Gets the child scripts that make up this block. This list is live
    63       * so that it can be modified if requried
    64       */
    65      public List getScriptList() {
    66          return list;
    67      }
    68
    69      // Script interface
    70      //-------------------------------------------------------------------------
    71      public Script compile() throws JellyException {
    72          int size = list.size();
    73          if (size == 1) {
    74              Script script = (Script) list.get(0);
    75              return script.compile();
    76          }
    77          // now compile children
    78          for (int i = 0; i < size; i++) {
    79              Script script = (Script) list.get(i);
    80              list.set(i, script.compile());
    81          }
    82          return this;
    83      }
    84
    85      /*** Evaluates the body of a tag */
    86      public void run(JellyContext context, XMLOutput output) throws JellyTagException {
    87  /*
    88          for (int i = 0, size = scripts.length; i < size; i++) {
    89              Script script = scripts[i];
    90              script.run(context, output);
    91          }
    92  */
    93          for (Iterator iter = list.iterator(); iter.hasNext(); ) {
    94              Script script = (Script) iter.next();
    95              script.run(context, output);
    96          }
    97      }
    98
    99      /***
    100      * Trim the body of the script.
    101      * In this case, trim all elements, removing any that are empty text.
    102      */
    103     public void trimWhitespace() {
    104         List list = getScriptList();
    105         for ( int i = list.size() - 1; i >= 0; i-- ) {
    106             Script script = (Script) list.get(i);
    107             if ( script instanceof TextScript ) {
    108                 TextScript textScript = (TextScript) script;
    109                 String text = textScript.getText();
    110                 text = text.trim();
    111                 if ( text.length() == 0 ) {
    112                     list.remove(i);
    113                 }
    114                 else {
    115                     textScript.setText(text);
    116                 }
    117             }
    118         }
    119     }
    120 }