/*
* 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 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;
}
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;
}
boolean isLiteral() {
return false;
}
protected Expression deepCloneWithIdentifierReplaced_inner(String replacedIdentifier, Expression replacement, ReplacemenetState replacementState) {
return new ExistsExpression(
exp.deepCloneWithIdentifierReplaced(replacedIdentifier, replacement, replacementState));
}
public String getCanonicalForm() {
return exp.getCanonicalForm() + getNodeTypeSymbol();
}
String getNodeTypeSymbol() {
return "??";
}
int getParameterCount() {
return 1;
}
Object getParameterValue(int idx) {
return exp;
}
ParameterRole getParameterRole(int idx) {
return ParameterRole.LEFT_HAND_OPERAND;
}
}