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1
52
53 package freemarker.core;
54
55 import java.io.IOException  ;
56 import freemarker.template.*;
57
58
59
62 final class VisitNode extends TemplateElement {
63
64 Expression targetNode, namespaces;
65
66 VisitNode(Expression targetNode, Expression namespaces) {
67 this.targetNode = targetNode;
68 this.namespaces = namespaces;
69 }
70
71 void accept(Environment env) throws IOException , TemplateException {
72 TemplateModel node = targetNode.getAsTemplateModel(env);
73 assertNonNull(node, targetNode, env);
74 if (!(node instanceof TemplateNodeModel)) {
75 throw new TemplateException("Expecting an XML node here", env);
76 }
77 TemplateModel nss = namespaces == null ? null : namespaces.getAsTemplateModel(env);
78 if (namespaces instanceof StringLiteral) {
79 nss = env.importLib(((TemplateScalarModel) nss).getAsString(), null);
80 }
81 else if (namespaces instanceof ListLiteral) {
82 nss = ((ListLiteral) namespaces).evaluateStringsToNamespaces(env);
83 }
84 if (nss != null) {
85 if (nss instanceof Environment.Namespace) {
86 SimpleSequence ss = new SimpleSequence(1);
87 ss.add(nss);
88 nss = ss;
89 }
90 else if (!(nss instanceof TemplateSequenceModel)) {
91 throw new TemplateException("Expecting a sequence of namespaces after 'using'", env);
92 }
93 }
94 env.visit((TemplateNodeModel) node, (TemplateSequenceModel) nss);
95 }
96
97 public String getCanonicalForm() {
98 if (namespaces == null) {
99 return "<#visit " + targetNode.getCanonicalForm() + "/>";
100 }
101 return "<#visit " + targetNode.getCanonicalForm() + " using " + namespaces.getCanonicalForm() + "/>";
102 }
103
104 public String getDescription() {
105 return "visit instruction";
106 }
107 }
108 |
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