freemarker.core.SwitchBlock 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.util.*;
import java.io.IOException;
import freemarker.template.*;
/**
* An instruction representing a switch-case structure.
*/
final class SwitchBlock extends TemplateElement {
private Case defaultCase;
private Expression testExpression;
/**
* @param testExpression the expression to be tested.
*/
SwitchBlock(Expression testExpression) {
this.testExpression = testExpression;
nestedElements = new LinkedList();
}
/**
* @param cas a Case element.
*/
void addCase(Case cas) {
if (cas.isDefault) {
defaultCase = cas;
}
nestedElements.add(cas);
}
void accept(Environment env)
throws TemplateException, IOException
{
boolean processedCase = false;
Iterator iterator = nestedElements.iterator();
try {
while (iterator.hasNext()) {
Case cas = (Case)iterator.next();
boolean processCase = false;
// Fall through if a previous case tested true.
if (processedCase) {
processCase = true;
} else if (!cas.isDefault) {
// Otherwise, if this case isn't the default, test it.
ComparisonExpression equalsOp = new ComparisonExpression(testExpression, cas.expression, "==");
processCase = equalsOp.isTrue(env);
}
if (processCase) {
env.visit(cas);
processedCase = true;
}
}
// If we didn't process any nestedElements, and we have a default,
// process it.
if (!processedCase && defaultCase != null) {
env.visit(defaultCase);
}
}
catch (BreakInstruction.Break br) {}
}
public String getCanonicalForm() {
StringBuffer buf = new StringBuffer("<#switch ");
buf.append(testExpression.getCanonicalForm());
buf.append(">");
for (int i = 0; i");
return buf.toString();
}
public String getDescription() {
return "switch " + testExpression;
}
}