freemarker.core.IfBlock Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package freemarker.core;
import java.io.IOException;
import freemarker.template.TemplateException;
/**
* Container for a group of related #if, #elseif and #else elements.
* Each such block is a nested {@link ConditionalBlock}. Note that if an #if has no #else or #elseif,
* {@link ConditionalBlock} doesn't need this parent element.
*/
final class IfBlock extends TemplateElement {
IfBlock(ConditionalBlock block) {
setChildBufferCapacity(1);
addBlock(block);
}
void addBlock(ConditionalBlock block) {
addChild(block);
}
@Override
TemplateElement[] accept(Environment env) throws TemplateException, IOException {
int ln = getChildCount();
for (int i = 0; i < ln; i++) {
ConditionalBlock cblock = (ConditionalBlock) getChild(i);
Expression condition = cblock.condition;
env.replaceElementStackTop(cblock);
if (condition == null || condition.evalToBoolean(env)) {
return cblock.getChildBuffer();
}
}
return null;
}
@Override
TemplateElement postParseCleanup(boolean stripWhitespace)
throws ParseException {
if (getChildCount() == 1) {
ConditionalBlock cblock = (ConditionalBlock) getChild(0);
cblock.setLocation(getTemplate(), cblock, this);
return cblock.postParseCleanup(stripWhitespace);
} else {
return super.postParseCleanup(stripWhitespace);
}
}
@Override
protected String dump(boolean canonical) {
if (canonical) {
StringBuilder buf = new StringBuilder();
int ln = getChildCount();
for (int i = 0; i < ln; i++) {
ConditionalBlock cblock = (ConditionalBlock) getChild(i);
buf.append(cblock.dump(canonical));
}
buf.append("");
return buf.toString();
} else {
return getNodeTypeSymbol();
}
}
@Override
String getNodeTypeSymbol() {
return "#if-#elseif-#else-container";
}
@Override
int getParameterCount() {
return 0;
}
@Override
Object getParameterValue(int idx) {
throw new IndexOutOfBoundsException();
}
@Override
ParameterRole getParameterRole(int idx) {
throw new IndexOutOfBoundsException();
}
@Override
boolean isNestedBlockRepeater() {
return false;
}
}