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org.apache.commons.jelly.impl.WeakReferenceWrapperScript |
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1 | /* |
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2 | * Copyright 2002,2004 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | package org.apache.commons.jelly.impl; |
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17 | ||
18 | import java.lang.ref.WeakReference; |
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19 | import java.util.Iterator; |
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20 | import java.util.List; |
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21 | ||
22 | import org.apache.commons.jelly.JellyContext; |
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23 | import org.apache.commons.jelly.JellyException; |
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24 | import org.apache.commons.jelly.JellyTagException; |
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25 | import org.apache.commons.jelly.Script; |
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26 | import org.apache.commons.jelly.XMLOutput; |
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27 | import org.apache.commons.jelly.util.TagUtils; |
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28 | ||
29 | /** Wraps another Script instance in a WeakReference. Used to prevent |
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30 | * a Tag class from holding a hard reference to its body script. |
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31 | * <p/> |
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32 | * If the underlying Script has been GC'd and is no longer available, |
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33 | * an exception is thrown on any attempt to use this Script. |
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34 | * <p/> |
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35 | * WARNING: This class is not a permanent part of the API and will be removed or replaced in a future release. |
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36 | * Don't extend it or use it unless you absolutely must. |
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37 | * |
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38 | * @author Hans Gilde |
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39 | * |
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40 | */ |
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41 | public class WeakReferenceWrapperScript implements Script { |
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42 | private WeakReference reference; |
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43 | ||
44 | 7701 | public WeakReferenceWrapperScript(Script script) { |
45 | 7701 | reference = new WeakReference(script); |
46 | 7701 | } |
47 | ||
48 | /* (non-Javadoc) |
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49 | * @see org.apache.commons.jelly.Script#compile() |
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50 | */ |
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51 | public Script compile() throws JellyException { |
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52 | 0 | return script().compile(); |
53 | } |
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54 | ||
55 | /** Use this method to access the script. |
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56 | * @throws JellyException If the script has been GC'd. |
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57 | */ |
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58 | public Script script() throws JellyTagException { |
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59 | 2868 | Script script = (Script) reference.get(); |
60 | ||
61 | 2868 | if (script == null) { |
62 | 0 | throw new JellyTagException("Attempt to use a script that has been garbage collected."); |
63 | } |
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64 | ||
65 | 2868 | return script; |
66 | } |
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67 | ||
68 | /* (non-Javadoc) |
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69 | * @see org.apache.commons.jelly.Script#run(org.apache.commons.jelly.JellyContext, org.apache.commons.jelly.XMLOutput) |
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70 | */ |
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71 | public void run(JellyContext context, XMLOutput output) |
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72 | throws JellyTagException { |
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73 | ||
74 | 1452 | script().run(context, output); |
75 | 1326 | } |
76 | ||
77 | /**Trims the white space from the script and its children. |
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78 | * TODO this code should be refactored into a formal part of the Script interface. |
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79 | * It has currently been cut and pasted from TagSupport. |
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80 | */ |
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81 | public void trimWhitespace() throws JellyTagException { |
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82 | 1416 | TagUtils.trimScript(script()); |
83 | 1416 | } |
84 | ||
85 | /** Determines if this script (the one in the WeakReference) |
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86 | * or a child reference contains a Script |
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87 | * that's of a particular class. |
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88 | * <p/> |
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89 | * <strong>This method is in place |
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90 | * to support specific features in the XML tag library and |
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91 | * shouldn't be used by anyone at all. |
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92 | * This method will be removed in a near-future verison of jelly.</strong> |
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93 | * <p/> |
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94 | * This method will be removed in a near-future verison of jelly. |
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95 | * XXX this is totally bogus and temporary, we should not need to check the type of scripts. |
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96 | * @param clazz Find a script that's an instance of this classs. |
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97 | * @throws JellyTagException |
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98 | */ |
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99 | public boolean containsScriptType(Class clazz) throws JellyTagException { |
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100 | 0 | Object bodyScript = script(); |
101 | ||
102 | 0 | if (clazz.isInstance(bodyScript)) { |
103 | 0 | return true; |
104 | } |
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105 | ||
106 | 0 | if (bodyScript instanceof ScriptBlock) { |
107 | 0 | ScriptBlock scriptBlock = (ScriptBlock) bodyScript; |
108 | 0 | List scriptList = scriptBlock.getScriptList(); |
109 | 0 | for (Iterator iter = scriptList.iterator(); iter.hasNext(); ) { |
110 | 0 | Script script = (Script) iter.next(); |
111 | 0 | if (script instanceof StaticTagScript) { |
112 | 0 | return true; |
113 | } |
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114 | } |
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115 | } |
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116 | ||
117 | 0 | return false; |
118 | } |
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119 | ||
120 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |