freemarker.core.ConditionalBlock 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 element that represents a conditionally executed block.
* @author Jonathan Revusky
*/
final class ConditionalBlock extends TemplateElement {
final Expression condition;
private final boolean isFirst;
boolean isSimple;
ConditionalBlock(Expression condition, TemplateElement nestedBlock, boolean isFirst)
{
this.condition = condition;
this.nestedBlock = nestedBlock;
this.isFirst = isFirst;
}
void accept(Environment env) throws TemplateException, IOException {
if (condition == null || condition.isTrue(env)) {
if (nestedBlock != null) {
env.visit(nestedBlock);
}
}
}
public String getCanonicalForm() {
StringBuffer buf = new StringBuffer();
if (condition == null) {
buf.append("<#else");
}
else if (isFirst) {
buf.append("<#if ");
}
else {
buf.append("<#elseif ");
}
if (condition != null) {
buf.append(condition.getCanonicalForm());
}
buf.append(">");
if (nestedBlock != null) {
buf.append(nestedBlock.getCanonicalForm());
}
if (isSimple) {
buf.append("");
}
return buf.toString();
}
public String getDescription() {
String s = "if ";
if (condition == null) {
s = "else ";
}
else if (!isFirst) {
s = "elseif ";
}
String cond = condition != null ? condition.toString() : "";
return s + cond;
}
}