/*
* Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
*
* Licensed 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 of #elseif,
* {@link ConditionalBlock} doesn't need this parent element.
*/
final class IfBlock extends TemplateElement {
IfBlock(ConditionalBlock block) {
setRegulatedChildBufferCapacity(1);
addBlock(block);
}
void addBlock(ConditionalBlock block) {
addRegulatedChild(block);
}
@Override
void accept(Environment env) throws TemplateException, IOException {
int ln = getRegulatedChildCount();
for (int i = 0; i < ln; i++) {
ConditionalBlock cblock = (ConditionalBlock) getRegulatedChild(i);
Expression condition = cblock.condition;
env.replaceElementStackTop(cblock);
if (condition == null || condition.evalToBoolean(env)) {
if (cblock.getNestedBlock() != null) {
env.visitByHiddingParent(cblock.getNestedBlock());
}
return;
}
}
}
@Override
TemplateElement postParseCleanup(boolean stripWhitespace)
throws ParseException {
if (getRegulatedChildCount() == 1) {
ConditionalBlock cblock = (ConditionalBlock) getRegulatedChild(0);
cblock.isLonelyIf = true;
cblock.setLocation(getUnboundTemplate(), 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 = getRegulatedChildCount();
for (int i = 0; i < ln; i++) {
ConditionalBlock cblock = (ConditionalBlock) getRegulatedChild(i);
buf.append(cblock.dump(canonical));
}
buf.append("</#if>");
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 isShownInStackTrace() {
return false;
}
@Override
boolean isNestedBlockRepeater() {
return false;
}
}