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Show all versions of com.liferay.portal.template.freemarker
Liferay Portal Template FreeMarker
/*
* 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 freemarker.template.TemplateBooleanModel;
import freemarker.template.TemplateException;
import freemarker.template.TemplateModel;
/** {@code exp??} and {@code (exp)??} */
class ExistsExpression extends Expression {
protected final Expression exp;
ExistsExpression(Expression exp) {
this.exp = exp;
}
@Override
TemplateModel _eval(Environment env) throws TemplateException {
TemplateModel tm;
if (exp instanceof ParentheticalExpression) {
boolean lastFIRE = env.setFastInvalidReferenceExceptions(true);
try {
tm = exp.eval(env);
} catch (InvalidReferenceException ire) {
tm = null;
} finally {
env.setFastInvalidReferenceExceptions(lastFIRE);
}
} else {
tm = exp.eval(env);
}
return tm == null ? TemplateBooleanModel.FALSE : TemplateBooleanModel.TRUE;
}
@Override
boolean isLiteral() {
return false;
}
@Override
protected Expression deepCloneWithIdentifierReplaced_inner(String replacedIdentifier, Expression replacement, ReplacemenetState replacementState) {
return new ExistsExpression(
exp.deepCloneWithIdentifierReplaced(replacedIdentifier, replacement, replacementState));
}
@Override
public String getCanonicalForm() {
return exp.getCanonicalForm() + getNodeTypeSymbol();
}
@Override
String getNodeTypeSymbol() {
return "??";
}
@Override
int getParameterCount() {
return 1;
}
@Override
Object getParameterValue(int idx) {
return exp;
}
@Override
ParameterRole getParameterRole(int idx) {
return ParameterRole.LEFT_HAND_OPERAND;
}
}
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