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48 lines
1.6 KiB
Java
48 lines
1.6 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.support.Expressions;
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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.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<?> combineUnion(SubQueryExpression<?>[] union, Path<?> alias, SQLTemplates templates, boolean unionAll) {
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StringBuilder builder = new StringBuilder("(");
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String separator = unionAll ? templates.getUnionAll() : templates.getUnion();
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for (int i = 0; i < union.length; i++) {
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if (i > 0) {
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builder.append(separator);
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}
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builder.append("{"+i+"}");
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}
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builder.append(")");
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Expression<?> combined = Expressions.template(Object.class, builder.toString(), union);
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return ExpressionUtils.as((Expression)combined, alias);
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}
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private UnionUtils() {}
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}
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