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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.TemplateException;
/**
* A class that handles comparisons.
*/
final class ComparisonExpression extends BooleanExpression {
private final Expression left;
private final Expression right;
private final int operation;
private final String opString;
ComparisonExpression(Expression left, Expression right, String opString) {
this.left = left;
this.right = right;
opString = opString.intern();
this.opString = opString;
if (opString == "==" || opString == "=") {
operation = EvalUtil.CMP_OP_EQUALS;
} else if (opString == "!=") {
operation = EvalUtil.CMP_OP_NOT_EQUALS;
} else if (opString == "gt" || opString == "\\gt" || opString == ">" || opString == ">") {
operation = EvalUtil.CMP_OP_GREATER_THAN;
} else if (opString == "gte" || opString == "\\gte" || opString == ">=" || opString == ">=") {
operation = EvalUtil.CMP_OP_GREATER_THAN_EQUALS;
} else if (opString == "lt" || opString == "\\lt" || opString == "<" || opString == "<") {
operation = EvalUtil.CMP_OP_LESS_THAN;
} else if (opString == "lte" || opString == "\\lte" || opString == "<=" || opString == "<=") {
operation = EvalUtil.CMP_OP_LESS_THAN_EQUALS;
} else {
throw new BugException("Unknown comparison operator " + opString);
}
Expression cleanedLeft = MiscUtil.peelParentheses(left);
Expression cleanedRight = MiscUtil.peelParentheses(right);
if (cleanedLeft instanceof BuiltInsForMultipleTypes.sizeBI) {
if (cleanedRight instanceof NumberLiteral) {
((BuiltInsForMultipleTypes.sizeBI) cleanedLeft).setCountingLimit(
operation, (NumberLiteral) cleanedRight
);
}
} else if (cleanedRight instanceof BuiltInsForMultipleTypes.sizeBI) {
if (cleanedLeft instanceof NumberLiteral) {
((BuiltInsForMultipleTypes.sizeBI) cleanedRight).setCountingLimit(
EvalUtil.mirrorCmpOperator(operation), (NumberLiteral) cleanedLeft
);
}
}
}
/*
* WARNING! This algorithm is duplicated in SequenceBuiltins.modelsEqual.
* Thus, if you update this method, then you have to update that too!
*/
@Override
boolean evalToBoolean(Environment env) throws TemplateException {
return EvalUtil.compare(left, operation, opString, right, this, env);
}
@Override
public String getCanonicalForm() {
return left.getCanonicalForm() + ' ' + opString + ' ' + right.getCanonicalForm();
}
@Override
String getNodeTypeSymbol() {
return opString;
}
@Override
boolean isLiteral() {
return constantValue != null || (left.isLiteral() && right.isLiteral());
}
@Override
protected Expression deepCloneWithIdentifierReplaced_inner(
String replacedIdentifier, Expression replacement, ReplacemenetState replacementState) {
return new ComparisonExpression(
left.deepCloneWithIdentifierReplaced(replacedIdentifier, replacement, replacementState),
right.deepCloneWithIdentifierReplaced(replacedIdentifier, replacement, replacementState),
opString);
}
@Override
int getParameterCount() {
return 2;
}
@Override
Object getParameterValue(int idx) {
return idx == 0 ? left : right;
}
@Override
ParameterRole getParameterRole(int idx) {
return ParameterRole.forBinaryOperatorOperand(idx);
}
}
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