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Java > Open Source Codes > org > apache > commons > jelly > impl > ScriptBlock


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 JavaDoc;
19 import java.util.Iterator JavaDoc;
20 import java.util.List JavaDoc;
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 JavaDoc list = new ArrayList JavaDoc();
37
38     /**
39      * Create a new instance.
40      */
41     public ScriptBlock() {
42     }
43
44     /**
45      * @see Object#toString()
46      */
47     public String JavaDoc 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 JavaDoc 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 JavaDoc 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 JavaDoc 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 JavaDoc text = textScript.getText();
110                 text = text.trim();
111                 if ( text.length() == 0 ) {
112                     list.remove(i);
113                 }
114             }
115         }
116     }
117 }
118
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