/* * Copyright 1999-2012 Alibaba Group. * * 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. */ /** * (created at 2011-1-12) */ package com.alibaba.cobar.parser.ast.expression.logical; import java.util.Map; import com.alibaba.cobar.parser.ast.expression.BinaryOperatorExpression; import com.alibaba.cobar.parser.ast.expression.Expression; import com.alibaba.cobar.parser.ast.expression.primary.literal.LiteralBoolean; import com.alibaba.cobar.parser.util.ExprEvalUtils; import com.alibaba.cobar.parser.visitor.SQLASTVisitor; /** * @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a> */ public class LogicalXORExpression extends BinaryOperatorExpression { public LogicalXORExpression(Expression left, Expression right) { super(left, right, PRECEDENCE_LOGICAL_XOR); } @Override public String getOperator() { return "XOR"; } @Override public Object evaluationInternal(Map<? extends Object, ? extends Object> parameters) { Object left = leftOprand.evaluation(parameters); Object right = rightOprand.evaluation(parameters); if (left == null || right == null) return null; if (left == UNEVALUATABLE || right == UNEVALUATABLE) return UNEVALUATABLE; boolean b1 = ExprEvalUtils.obj2bool(left); boolean b2 = ExprEvalUtils.obj2bool(right); return b1 != b2 ? LiteralBoolean.TRUE : LiteralBoolean.FALSE; } @Override public void accept(SQLASTVisitor visitor) { visitor.visit(this); } }