| /******************************************************************************* |
| * 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 org.apache.sling.scripting.sightly.java.compiler.impl.operator; |
| |
| import org.apache.sling.scripting.sightly.compiler.expression.SideEffectVisitor; |
| import org.apache.sling.scripting.sightly.java.compiler.impl.ExpressionTranslator; |
| import org.apache.sling.scripting.sightly.java.compiler.impl.JavaSource; |
| import org.apache.sling.scripting.sightly.java.compiler.impl.Type; |
| import org.apache.sling.scripting.sightly.compiler.expression.ExpressionNode; |
| |
| /** |
| * Generator for logical operators |
| */ |
| public class EquivalenceOpGen implements BinaryOpGen { |
| |
| private final boolean negated; |
| |
| public EquivalenceOpGen(boolean negated) { |
| this.negated = negated; |
| } |
| |
| @Override |
| public Type returnType(Type left, Type right) { |
| return Type.BOOLEAN; |
| } |
| |
| @Override |
| public void generate(JavaSource source, ExpressionTranslator visitor, TypedNode left, TypedNode right) { |
| Type type = OpHelper.sameType(left, right); |
| if (type != null && OpHelper.isNumericType(type) || type == Type.BOOLEAN || type == Type.UNKNOWN) { |
| generateEqualsOperator(source, visitor, left.getNode(), right.getNode()); |
| } else { |
| generateEqualsMethod(source, visitor, left, right); |
| } |
| } |
| |
| private void generateCheckedEquals(JavaSource source, SideEffectVisitor visitor, TypedNode leftNode, TypedNode rightNode) { |
| source.startExpression(); |
| leftNode.getNode().accept(visitor); |
| source.equality().nullLiteral().conditional(); |
| rightNode.getNode().accept(visitor); |
| source.equality().nullLiteral(); |
| source.conditionalBranchSep(); |
| generateEqualsMethod(source, visitor, leftNode, rightNode); |
| source.endExpression(); |
| } |
| |
| private void generateEqualsMethod(JavaSource source, SideEffectVisitor visitor, TypedNode leftNode, TypedNode rightNode) { |
| boolean performCast = leftNode.getType().isPrimitive(); |
| if (negated) { |
| source.negation(); |
| } |
| if (performCast) { |
| source.startExpression(); |
| source.cast(Type.UNKNOWN.getNativeClass()); |
| } |
| leftNode.getNode().accept(visitor); |
| if (performCast) { |
| source.endExpression(); |
| } |
| source.startCall("equals", true); |
| rightNode.getNode().accept(visitor); |
| source.endCall(); |
| } |
| |
| private void generateEqualsOperator(JavaSource source, SideEffectVisitor visitor, ExpressionNode leftNode, ExpressionNode rightNode) { |
| leftNode.accept(visitor); |
| source.append(" ").append(operator()).append(" "); |
| rightNode.accept(visitor); |
| } |
| |
| private String operator() { |
| return (negated) ? "!=" : "=="; |
| } |
| |
| } |