QueryGraphRangeUtil.java

/**************************************************************************************
 * Copyright (C) 2008 EsperTech, Inc. All rights reserved.                            *
 * http://esper.codehaus.org                                                          *
 * http://www.espertech.com                                                           *
 * ---------------------------------------------------------------------------------- *
 * The software in this package is published under the terms of the GPL license       *
 * a copy of which has been included with this distribution in the license.txt file.  *
 **************************************************************************************/
package com.espertech.esper.epl.join.plan;

import com.espertech.esper.collection.MultiKeyUntyped;

import java.util.*;

/**
 * Property lists stored as a value for each stream-to-stream relationship, for use by {@link com.espertech.esper.epl.join.plan.QueryGraph}.
 */
public class QueryGraphRangeUtil
{
    private static final Map<MultiKeyUntyped, QueryGraphRangeConsolidateDesc> opsTable = new HashMap<MultiKeyUntyped, QueryGraphRangeConsolidateDesc>();
    static {
        add(QueryGraphRangeEnum.LESS_OR_EQUAL, QueryGraphRangeEnum.GREATER_OR_EQUAL, QueryGraphRangeEnum.RANGE_CLOSED);
        add(QueryGraphRangeEnum.LESS, QueryGraphRangeEnum.GREATER, QueryGraphRangeEnum.RANGE_OPEN);
        add(QueryGraphRangeEnum.LESS_OR_EQUAL, QueryGraphRangeEnum.GREATER, QueryGraphRangeEnum.RANGE_HALF_CLOSED);
        add(QueryGraphRangeEnum.LESS, QueryGraphRangeEnum.GREATER_OR_EQUAL, QueryGraphRangeEnum.RANGE_HALF_OPEN);
    }

    private static void add(QueryGraphRangeEnum opOne, QueryGraphRangeEnum opTwo, QueryGraphRangeEnum range) {
        MultiKeyUntyped keyOne = getKey(opOne, opTwo);
        opsTable.put(keyOne, new QueryGraphRangeConsolidateDesc(range, false));
        MultiKeyUntyped keyRev = getKey(opTwo, opOne);
        opsTable.put(keyRev, new QueryGraphRangeConsolidateDesc(range, true));
    }

    private static MultiKeyUntyped getKey(QueryGraphRangeEnum op1, QueryGraphRangeEnum op2) {
        return new MultiKeyUntyped(new Object[] {op1, op2});
    }

    public static QueryGraphRangeConsolidateDesc getCanConsolidate(QueryGraphRangeEnum op1, QueryGraphRangeEnum op2) {
        return opsTable.get(getKey(op1, op2));
    }
}