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Java > Open Source Codes > freemarker > core > RecurseNode


1 /*
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18  * any, must include the following acknowledgement:
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20  * Visigoth Software Society (http://www.visigoths.org/)."
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22  * if and wherever such third-party acknowledgements normally appear.
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51  */

52
53 package freemarker.core;
54
55 import java.io.IOException JavaDoc;
56 import freemarker.template.*;
57
58
59 /**
60  * An instruction to visit the children of a node.
61  */

62 final class RecurseNode extends TemplateElement {
63     
64     Expression targetNode, namespaces;
65     
66     RecurseNode(Expression targetNode, Expression namespaces) {
67         this.targetNode = targetNode;
68         this.namespaces = namespaces;
69     }
70
71     void accept(Environment env) throws IOException JavaDoc, TemplateException {
72         TemplateModel node = targetNode == null ? null : targetNode.getAsTemplateModel(env);
73         TemplateModel nss = namespaces == null ? null : namespaces.getAsTemplateModel(env);
74         if (namespaces instanceof StringLiteral) {
75             nss = env.importLib(((TemplateScalarModel) nss).getAsString(), null);
76         }
77         else if (namespaces instanceof ListLiteral) {
78             nss = ((ListLiteral) namespaces).evaluateStringsToNamespaces(env);
79         }
80         if (node != null && !(node instanceof TemplateNodeModel)) {
81             throw new TemplateException("Expecting an XML node here, for expression: " + targetNode + ", found a: " + node.getClass().getName(), env);
82         }
83         if (nss != null) {
84             if (nss instanceof TemplateHashModel) {
85                 SimpleSequence ss = new SimpleSequence(1);
86                 ss.add(nss);
87                 nss = ss;
88             }
89             else if (!(nss instanceof TemplateSequenceModel)) {
90                 throw new TemplateException("Expecting a sequence of namespaces after 'using'", env);
91             }
92         }
93         
94         env.recurse((TemplateNodeModel) node, (TemplateSequenceModel) nss);
95     }
96
97     public String JavaDoc getCanonicalForm() {
98         String JavaDoc result = "<#recurse";
99         if (targetNode != null) result += (" " + targetNode.getCanonicalForm());
100         if (namespaces != null) result += (" using " + namespaces.getCanonicalForm());
101         return result + "/>";
102     }
103
104     public String JavaDoc getDescription() {
105         return "recurse instruction";
106     }
107 }
108
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