net.ontopia.persistence.query.jdo.JDOSetOperation.java Source code

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Here is the source code for net.ontopia.persistence.query.jdo.JDOSetOperation.java

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/*
 * #!
 * Ontopia Engine
 * #-
 * Copyright (C) 2001 - 2013 The Ontopia Project
 * #-
 * 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 net.ontopia.persistence.query.jdo;

import java.util.List;
import net.ontopia.utils.OntopiaRuntimeException;
import org.apache.commons.lang3.StringUtils;

/**
 * INTERNAL: JDOQL set operation.
 */

public class JDOSetOperation implements JDOExpressionIF {

    public static final int UNION = 10;
    public static final int UNION_ALL = 11;
    public static final int INTERSECT = 20;
    public static final int INTERSECT_ALL = 21;
    public static final int EXCEPT = 30;
    public static final int EXCEPT_ALL = 31;

    protected List sets;
    protected int operator;

    public JDOSetOperation(List sets, int operator) {
        // A set contain either JDOQuery or JDOSetOperation instances.
        // FIXME: Sets must have same width and compatible types.
        this.sets = sets;
        this.operator = operator;
    }

    public int getOperator() {
        return operator;
    }

    public List getSets() {
        return sets;
    }

    @Override
    public int getType() {
        return SET_OPERATION;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        String op;
        switch (operator) {
        case UNION:
            op = ") union (";
            break;
        case UNION_ALL:
            op = ") union all (";
            break;
        case INTERSECT:
            op = ") intersect (";
            break;
        case INTERSECT_ALL:
            op = ") intersect all (";
            break;
        case EXCEPT:
            op = ") except (";
            break;
        case EXCEPT_ALL:
            op = ") except all (";
            break;
        default:
            throw new OntopiaRuntimeException("Unsupported set operator: '" + operator + "'");
        }
        sb.append('(');
        sb.append(StringUtils.join(sets, op));
        sb.append(')');
        return sb.toString();
    }

    @Override
    public void visit(JDOVisitorIF visitor) {
        throw new UnsupportedOperationException();
    }

}