Mercurial > hg > release > thermostat-1.0
view storage/core/src/main/java/com/redhat/thermostat/storage/query/BinaryExpression.java @ 1412:a0592d702416
Update copyright year in release branch.
reviewed-by: neugens
review-thread: http://icedtea.classpath.org/pipermail/thermostat/2014-June/009965.html
PR1821
author | Jon VanAlten <jon.vanalten@redhat.com> |
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date | Tue, 03 Jun 2014 11:55:56 -0600 |
parents | bf720980510c |
children |
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/* * Copyright 2012-2014 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2, or (at your * option) any later version. * * Thermostat is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code with independent modules to * produce an executable, regardless of the license terms of these * independent modules, and to copy and distribute the resulting * executable under terms of your choice, provided that you also * meet, for each linked independent module, the terms and conditions * of the license of that module. An independent module is a module * which is not derived from or based on this code. If you modify * this code, you may extend this exception to your version of the * library, but you are not obligated to do so. If you do not wish * to do so, delete this exception statement from your version. */ package com.redhat.thermostat.storage.query; /** * An {@link Expression} with two operands and one operator. * @param <S> - the type of {@link Expression} corresponding to the left operand * @param <T> - the type of {@link Expression} corresponding to the right operand * @param <U> - the type of {@link BinaryOperator} corresponding to the operator */ abstract class BinaryExpression<S extends Expression, T extends Expression, U extends BinaryOperator> implements Expression { private S leftOperand; private U operator; private T rightOperand; /** * Constructs a {@link BinaryExpression} given two operands and an operator. * <p> * This constructor exists mainly for JSON serialization, use methods in * {@link ExpressionFactory} instead of this constructor. * @param leftOperand - left operand for this expression * @param operator - the operator for this expression * @param rightOperand - right operand for this expression */ BinaryExpression(S leftOperand, U operator, T rightOperand) { this.leftOperand = leftOperand; this.operator = operator; this.rightOperand = rightOperand; } /** * @return the left operand of this expression */ public S getLeftOperand() { return leftOperand; } /** * @return the operator of this expression */ public U getOperator() { return operator; } /** * @return the right operand of this expression */ public T getRightOperand() { return rightOperand; } @Override public boolean equals(Object obj) { boolean result = false; if (obj != null && obj instanceof BinaryExpression) { BinaryExpression<?, ?, ?> otherExpr = (BinaryExpression<?, ?, ?>) obj; result = leftOperand.equals(otherExpr.leftOperand) && rightOperand.equals(otherExpr.rightOperand) && operator.equals(otherExpr.operator); } return result; } @Override public int hashCode() { return leftOperand.hashCode() + operator.hashCode() + rightOperand.hashCode(); } @Override public String toString() { StringBuffer buf = new StringBuffer(); buf.append("( "); buf.append(leftOperand.toString()); buf.append(" "); buf.append(operator.toString()); buf.append(" "); buf.append(rightOperand.toString()); buf.append(" )"); return buf.toString(); } }