Package org.hsqldb_voltpatches

Source Code of org.hsqldb_voltpatches.ExpressionAggregate

/* Copyright (c) 2001-2009, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


package org.hsqldb_voltpatches;

import org.hsqldb_voltpatches.lib.ArrayListIdentity;
import org.hsqldb_voltpatches.lib.HsqlList;
import org.hsqldb_voltpatches.types.NumberType;
import org.hsqldb_voltpatches.store.ValuePool;

/**
* Implementation of aggregate operations
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 1.9.0
* @since 1.9.0
*/
public class ExpressionAggregate extends Expression {

    boolean isDistinctAggregate;

    ExpressionAggregate(int type, boolean distinct, Expression e) {

        super(type);

        nodes               = new Expression[UNARY];
        isDistinctAggregate = distinct;
        nodes[LEFT]         = e;
    }

    ExpressionAggregate(ExpressionAggregate e) {

        super(e.opType);

        isDistinctAggregate = e.isDistinctAggregate;
        nodes               = e.nodes;
    }

    boolean isSelfAggregate() {
        return true;
    }

    public String getSQL() {

        StringBuffer sb   = new StringBuffer(64);
        String       left = getContextSQL(nodes.length > 0 ? nodes[LEFT]
                                                           : null);

        switch (opType) {

            case OpTypes.COUNT :
                sb.append(' ').append(Tokens.T_COUNT).append('(');
                break;

            case OpTypes.SUM :
                sb.append(' ').append(Tokens.T_SUM).append('(');
                sb.append(left).append(')');
                break;

            case OpTypes.MIN :
                sb.append(' ').append(Tokens.T_MIN).append('(');
                sb.append(left).append(')');
                break;

            case OpTypes.MAX :
                sb.append(' ').append(Tokens.T_MAX).append('(');
                sb.append(left).append(')');
                break;

            case OpTypes.AVG :
                sb.append(' ').append(Tokens.T_AVG).append('(');
                sb.append(left).append(')');
                break;

            case OpTypes.EVERY :
                sb.append(' ').append(Tokens.T_EVERY).append('(');
                sb.append(left).append(')');
                break;

            case OpTypes.SOME :
                sb.append(' ').append(Tokens.T_SOME).append('(');
                sb.append(left).append(')');
                break;

            case OpTypes.STDDEV_POP :
                sb.append(' ').append(Tokens.T_STDDEV_POP).append('(');
                sb.append(left).append(')');
                break;

            case OpTypes.STDDEV_SAMP :
                sb.append(' ').append(Tokens.T_STDDEV_SAMP).append('(');
                sb.append(left).append(')');
                break;

            case OpTypes.VAR_POP :
                sb.append(' ').append(Tokens.T_VAR_POP).append('(');
                sb.append(left).append(')');
                break;

            case OpTypes.VAR_SAMP :
                sb.append(' ').append(Tokens.T_VAR_SAMP).append('(');
                sb.append(left).append(')');
                break;

            default :
                throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
        }

        return sb.toString();
    }

    protected String describe(Session session, int blanks) {

        StringBuffer sb = new StringBuffer(64);

        sb.append('\n');

        for (int i = 0; i < blanks; i++) {
            sb.append(' ');
        }

        switch (opType) {

            case OpTypes.COUNT :
                sb.append("COUNT ");
                break;

            case OpTypes.SUM :
                sb.append("SUM ");
                break;

            case OpTypes.MIN :
                sb.append("MIN ");
                break;

            case OpTypes.MAX :
                sb.append("MAX ");
                break;

            case OpTypes.AVG :
                sb.append("AVG ");
                break;

            case OpTypes.EVERY :
                sb.append(Tokens.T_EVERY).append(' ');
                break;

            case OpTypes.SOME :
                sb.append(Tokens.T_SOME).append(' ');
                break;

            case OpTypes.STDDEV_POP :
                sb.append(Tokens.T_STDDEV_POP).append(' ');
                break;

            case OpTypes.STDDEV_SAMP :
                sb.append(Tokens.T_STDDEV_SAMP).append(' ');
                break;

            case OpTypes.VAR_POP :
                sb.append(Tokens.T_VAR_POP).append(' ');
                break;

            case OpTypes.VAR_SAMP :
                sb.append(Tokens.T_VAR_SAMP).append(' ');
                break;
        }

        if (nodes[LEFT] != null) {
            sb.append(" arg1=[");
            sb.append(nodes[LEFT].describe(session, blanks + 1));
            sb.append(']');
        }

        return sb.toString();
    }

    public HsqlList resolveColumnReferences(RangeVariable[] rangeVarArray,
            int rangeCount, HsqlList unresolvedSet, boolean acceptsSequences) {

        if (unresolvedSet == null) {
            unresolvedSet = new ArrayListIdentity();
        }

        unresolvedSet.add(this);

        return unresolvedSet;
    }

    public void resolveTypes(Session session, Expression parent) {

        for (int i = 0; i < nodes.length; i++) {
            if (nodes[i] != null) {
                nodes[i].resolveTypes(session, this);
            }
        }

        if (nodes[LEFT].isParam) {
            throw Error.error(ErrorCode.X_42567);
        }

        dataType = SetFunction.getType(opType, nodes[LEFT].dataType);
    }

    public boolean equals(Expression other) {

        if (other == this) {
            return true;
        }

        if (other == null) {
            return false;
        }

        return opType == other.opType && exprSubType == other.exprSubType
               && isDistinctAggregate
                  == ((ExpressionAggregate) other)
                      .isDistinctAggregate && equals(nodes, other.nodes);
    }

    public Object updateAggregatingValue(Session session, Object currValue) {

        if (currValue == null) {
            currValue = new SetFunction(opType, nodes[LEFT].dataType,
                                        isDistinctAggregate);
        }

        Object newValue = nodes[LEFT].opType == OpTypes.ASTERISK
                          ? ValuePool.INTEGER_1
                          : nodes[LEFT].getValue(session);

        ((SetFunction) currValue).add(session, newValue);

        return currValue;
    }

    /**
     * Get the result of a SetFunction or an ordinary value
     *
     * @param currValue instance of set function or value
     * @param session context
     * @return object
     */
    public Object getAggregatedValue(Session session, Object currValue) {

        if (currValue == null) {
            return opType == OpTypes.COUNT ? ValuePool.INTEGER_0
                                           : null;
        }

        return ((SetFunction) currValue).getValue();
    }
}
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