| /* |
| * 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); |
| } |
| } |
| |
| /* |
| * 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); |
| } |
| |
| } |