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Java > Open Source Codes > freemarker > core > TransformBlock


1 /*
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3  * reserved.
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13  * notice, this list of conditions and the following disclaimer in
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17  * 3. The end-user documentation included with the redistribution, if
18  * any, must include the following acknowledgement:
19  * "This product includes software developed by the
20  * Visigoth Software Society (http://www.visigoths.org/)."
21  * Alternately, this acknowledgement may appear in the software itself,
22  * if and wherever such third-party acknowledgements normally appear.
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24  * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
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48  * individuals on behalf of the Visigoth Software Society. For more
49  * information on the Visigoth Software Society, please see
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51  */
52
53 package freemarker.core;
54
55 import java.io.*;
56 import java.util.*;
57 import freemarker.template.*;
58
59 /**
60  * A template element that contains a nested block
61  * that is transformed according to an instance of T
62  * TemplateTransformModel
63  */
64 final class TransformBlock extends TemplateElement {
65
66     private Expression transformExpression;
67     Map namedArgs;
68
69     /** Creates new TransformBlock, with a given transformation
70      * @param variable the variable representing the transformation to use
71      */
72     TransformBlock(Expression transformExpression,
73                    Map namedArgs,
74                    TemplateElement nestedBlock) {
75         this.transformExpression = transformExpression;
76         this.namedArgs = namedArgs;
77         this.nestedBlock = nestedBlock;
78     }
79
80     void accept(Environment env)
81     throws TemplateException, IOException
82     {
83         TemplateTransformModel ttm = env.getTransform(transformExpression);
84         if (ttm != null) {
85             Map args;
86             if (namedArgs != null && !namedArgs.isEmpty()) {
87                 args = new HashMap();
88                 for (Iterator it = namedArgs.entrySet().iterator(); it.hasNext();) {
89                     Map.Entry entry = (Map.Entry) it.next();
90                     String JavaDoc key = (String JavaDoc) entry.getKey();
91                     Expression valueExp = (Expression) entry.getValue();
92                     TemplateModel value = valueExp.getAsTemplateModel(env);
93                     args.put(key, value);
94                 }
95             } else {
96                 args = EmptyMap.instance;
97             }
98             env.visit(nestedBlock, ttm, args);
99         }
100         else {
101             TemplateModel tm = transformExpression.getAsTemplateModel(env);
102             throw invalidTypeException(tm, transformExpression, env, "transform");
103         }
104     }
105
106     public String JavaDoc getCanonicalForm() {
107         StringBuffer JavaDoc buf = new StringBuffer JavaDoc("<#transform ");
108         buf.append(transformExpression);
109         if (namedArgs != null) {
110             for (Iterator it = namedArgs.entrySet().iterator(); it.hasNext();) {
111                 Map.Entry entry = (Map.Entry) it.next();
112                 buf.append(' ');
113                 buf.append(entry.getKey());
114                 buf.append('=');
115                 Expression val = (Expression) entry.getValue();
116                 buf.append(val.getCanonicalForm());
117             }
118         }
119         buf.append(">");
120         if (nestedBlock != null) {
121             buf.append(nestedBlock.getCanonicalForm());
122         }
123         buf.append("</#transform>");
124         return buf.toString();
125     }
126
127     public String JavaDoc getDescription() {
128         return "transform " + transformExpression;
129     }
130 }
131
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