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49 lines
1.7 KiB
Java
49 lines
1.7 KiB
Java
/*
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* Copyright 2012, Mysema Ltd
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.mysema.query.sql;
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import com.mysema.query.types.Expression;
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import com.mysema.query.types.ExpressionUtils;
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import com.mysema.query.types.OperationImpl;
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import com.mysema.query.types.Operator;
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import com.mysema.query.types.Path;
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import com.mysema.query.types.SubQueryExpression;
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/**
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* UnionUtils provides static utility methods for Union handling
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*
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* @author tiwe
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*
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*/
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public final class UnionUtils {
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public static Expression<?> union(SubQueryExpression<?>[] union, boolean unionAll) {
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final Operator<Object> operator = unionAll ? SQLTemplates.UNION_ALL : SQLTemplates.UNION;
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Expression<?> rv = union[0];
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for (int i = 1; i < union.length; i++) {
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rv = OperationImpl.create(rv.getType(), operator, rv, union[i]);
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}
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return rv;
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}
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public static Expression<?> union(SubQueryExpression<?>[] union, Path<?> alias,
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boolean unionAll) {
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final Expression<?> rv = union(union, unionAll);
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return ExpressionUtils.as((Expression)rv, alias);
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}
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private UnionUtils() {}
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}
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