Mercurial > hg > release > thermostat-1.6
view storage/core/src/main/java/com/redhat/thermostat/storage/query/ExpressionFactory.java @ 2049:a92d602216ad
Update copyright license headers for 2017
PR3290
Reviewed-by: jerboaa
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2017-January/021974.html
author | Andrew Azores <aazores@redhat.com> |
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date | Tue, 17 Jan 2017 12:19:56 -0500 |
parents | 31f274ab27a5 |
children |
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/* * Copyright 2012-2017 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; import java.util.Set; import com.redhat.thermostat.storage.core.Key; import com.redhat.thermostat.storage.core.Query; /** * This class provides convenience methods that should be used * to create all expressions used in queries. * * @see Expression * @see Query#where(Expression) */ public class ExpressionFactory { /** * Creates a {@link BinaryComparisonExpression} comparing the * provided key and value for equality. * @param key - {@link Key} whose value to compare against the provided value * @param value - the value to compare against the key * @return the new comparison expression */ public <T> BinaryComparisonExpression<T> equalTo(Key<T> key, T value) { return createComparisonExpression(key, value, BinaryComparisonOperator.EQUALS); } /** * Creates a {@link BinaryComparisonExpression} comparing the * provided key and value for inequality. * @param key - {@link Key} whose value to compare against the provided value * @param value - the value to compare against the key * @return the new comparison expression */ public <T> BinaryComparisonExpression<T> notEqualTo(Key<T> key, T value) { return createComparisonExpression(key, value, BinaryComparisonOperator.NOT_EQUAL_TO); } /** * Creates a {@link BinaryComparisonExpression} comparing if the * provided key has a value greater than the provided value. * @param key - {@link Key} whose value to compare against the provided value * @param value - the value to compare against the key * @return the new comparison expression */ public <T> BinaryComparisonExpression<T> greaterThan(Key<T> key, T value) { return createComparisonExpression(key, value, BinaryComparisonOperator.GREATER_THAN); } /** * Creates a {@link BinaryComparisonExpression} comparing if the * provided key has a value less than the provided value. * @param key - {@link Key} whose value to compare against the provided value * @param value - the value to compare against the key * @return the new comparison expression */ public <T> BinaryComparisonExpression<T> lessThan(Key<T> key, T value) { return createComparisonExpression(key, value, BinaryComparisonOperator.LESS_THAN); } /** * Creates a {@link BinaryComparisonExpression} comparing if the * provided key has a value greater than or equal to the provided value. * @param key - {@link Key} whose value to compare against the provided value * @param value - the value to compare against the key * @return the new comparison expression */ public <T> BinaryComparisonExpression<T> greaterThanOrEqualTo(Key<T> key, T value) { return createComparisonExpression(key, value, BinaryComparisonOperator.GREATER_THAN_OR_EQUAL_TO); } /** * Creates a {@link BinaryComparisonExpression} comparing if the * provided key has a value less than or equal to the provided value. * @param key - {@link Key} whose value to compare against the provided value * @param value - the value to compare against the key * @return the new comparison expression */ public <T> BinaryComparisonExpression<T> lessThanOrEqualTo(Key<T> key, T value) { return createComparisonExpression(key, value, BinaryComparisonOperator.LESS_THAN_OR_EQUAL_TO); } /** * Creates a {@link BinarySetMembershipExpression} comparing if the * provided key has a value equal to any of the provided values. * @param key - {@link Key} whose value to compare against the provided values * @param value - a set of values to compare against the key * @param type - the type of values of stored in the provided set * @return the new comparison expression */ public <T> BinarySetMembershipExpression<T> in(Key<T> key, Set<T> values, Class<T> type) { return createSetMembershipExpression(key, values, BinarySetMembershipOperator.IN, type); } /** * Creates a {@link BinarySetMembershipExpression} comparing if the * provided key has a value not equal to all of the provided values. * @param key - {@link Key} whose value to compare against the provided values * @param value - a set of values to compare against the key * @param type - the type of values of stored in the provided set * @return the new comparison expression */ public <T> BinarySetMembershipExpression<T> notIn(Key<T> key, Set<T> values, Class<T> type) { return createSetMembershipExpression(key, values, BinarySetMembershipOperator.NOT_IN, type); } /** * Creates a {@link UnaryLogicalExpression} which is a logical * negation of the provided expression. * @param expr - the expression to negate * @return the new negated expression */ public <T extends ComparisonExpression> UnaryLogicalExpression<T> not(T expr) { return new UnaryLogicalExpression<>(expr, UnaryLogicalOperator.NOT); } /** * Creates a {@link BinaryLogicalExpression} with the two provided expressions * joined in order by a logical AND operation. * @param left - the left operand * @param right - the right operand * @return the new logical expression */ public <S extends Expression, T extends Expression> BinaryLogicalExpression<S, T> and(S left, T right) { return new BinaryLogicalExpression<S, T>(left, BinaryLogicalOperator.AND, right); } /** * Creates a {@link BinaryLogicalExpression} with the two provided expressions * joined in order by a logical OR operation. * @param left - the left operand * @param right - the right operand * @return the new logical expression */ public <S extends Expression, T extends Expression> BinaryLogicalExpression<S, T> or(S left, T right) { return new BinaryLogicalExpression<S, T>(left, BinaryLogicalOperator.OR, right); } private <T> BinaryComparisonExpression<T> createComparisonExpression(Key<T> key, T value, BinaryComparisonOperator op) { return new BinaryComparisonExpression<>(new LiteralExpression<>(key), op, new LiteralExpression<>(value)); } private <T> BinarySetMembershipExpression<T> createSetMembershipExpression(Key<T> key, Set<T> values, BinarySetMembershipOperator op, Class<T> type) { return new BinarySetMembershipExpression<>(new LiteralExpression<>(key), op, new LiteralSetExpression<>(values, type)); } }