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    • com.mysema.query.sql.UnionUtils Maven / Gradle / Ivy

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    /*
 * Copyright 2012, Mysema Ltd
 *
 * 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.
 */
package com.mysema.query.sql;

import com.mysema.query.types.Expression;
import com.mysema.query.types.ExpressionUtils;
import com.mysema.query.types.OperationImpl;
import com.mysema.query.types.Operator;
import com.mysema.query.types.Path;
import com.mysema.query.types.SubQueryExpression;

/**
 * UnionUtils provides static utility methods for Union handling
 *
 * @author tiwe
 *
 */
public final class UnionUtils {

    public static Expression union(SubQueryExpression[] union, boolean unionAll) {
        final Operator operator = unionAll ? SQLOps.UNION_ALL : SQLOps.UNION;
        Expression rv = union[0];
        for (int i = 1; i < union.length; i++) {
            rv = OperationImpl.create(rv.getType(), operator, rv, union[i]);
        }
        return rv;
    }

    public static Expression union(SubQueryExpression[] union, Path alias,
            boolean unionAll) {
        final Expression rv = union(union, unionAll);
        return ExpressionUtils.as((Expression)rv, alias);
    }

    private UnionUtils() {}

}
    
    
    
    

    




    
    
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