freemarker.core.VisitNode Maven / Gradle / Ivy
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Google App Engine compliant variation of FreeMarker.
FreeMarker is a "template engine"; a generic tool to generate text output based on templates.
/*
* Copyright (c) 2003 The Visigoth Software Society. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowledgement:
* "This product includes software developed by the
* Visigoth Software Society (http://www.visigoths.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
*
* 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
* project contributors may be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
* nor may "FreeMarker" or "Visigoth" appear in their names
* without prior written permission of the Visigoth Software Society.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Visigoth Software Society. For more
* information on the Visigoth Software Society, please see
* http://www.visigoths.org/
*/
package freemarker.core;
import java.io.IOException;
import freemarker.template.*;
/**
* An instruction to visit an XML node.
*/
final class VisitNode extends TemplateElement {
Expression targetNode, namespaces;
VisitNode(Expression targetNode, Expression namespaces) {
this.targetNode = targetNode;
this.namespaces = namespaces;
}
void accept(Environment env) throws IOException, TemplateException {
TemplateModel node = targetNode.getAsTemplateModel(env);
assertNonNull(node, targetNode, env);
if (!(node instanceof TemplateNodeModel)) {
throw new TemplateException("Expecting an XML node here", env);
}
TemplateModel nss = namespaces == null ? null : namespaces.getAsTemplateModel(env);
if (namespaces instanceof StringLiteral) {
nss = env.importLib(((TemplateScalarModel) nss).getAsString(), null);
}
else if (namespaces instanceof ListLiteral) {
nss = ((ListLiteral) namespaces).evaluateStringsToNamespaces(env);
}
if (nss != null) {
if (nss instanceof Environment.Namespace) {
SimpleSequence ss = new SimpleSequence(1);
ss.add(nss);
nss = ss;
}
else if (!(nss instanceof TemplateSequenceModel)) {
throw new TemplateException("Expecting a sequence of namespaces after 'using'", env);
}
}
env.visit((TemplateNodeModel) node, (TemplateSequenceModel) nss);
}
public String getCanonicalForm() {
if (namespaces == null) {
return "<#visit " + targetNode.getCanonicalForm() + "/>";
}
return "<#visit " + targetNode.getCanonicalForm() + " using " + namespaces.getCanonicalForm() + "/>";
}
public String getDescription() {
return "visit instruction";
}
}