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/* Copyright (c) 2001-2014, 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
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.ArrayListIdentity;
import org.hsqldb.lib.HsqlList;
import org.hsqldb.map.ValuePool;
import org.hsqldb.types.ArrayType;
import org.hsqldb.types.RowType;
/**
* Implementation of aggregate operations
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.0
* @since 1.9.0
*/
public class ExpressionAggregate extends Expression {
boolean isDistinctAggregate;
ArrayType arrayType;
ExpressionAggregate(int type, boolean distinct, Expression e) {
super(type);
nodes = new Expression[BINARY];
isDistinctAggregate = distinct;
nodes[LEFT] = e;
nodes[RIGHT] = Expression.EXPR_TRUE;
}
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,
"ExpressionAggregate");
}
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(Tokens.T_COUNT).append(' ');
break;
case OpTypes.SUM :
sb.append(Tokens.T_SUM).append(' ');
break;
case OpTypes.MIN :
sb.append(Tokens.T_MIN).append(' ');
break;
case OpTypes.MAX :
sb.append(Tokens.T_MAX).append(' ');
break;
case OpTypes.AVG :
sb.append(Tokens.T_AVG).append(' ');
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 (getLeftNode() != null) {
sb.append(" arg=[");
sb.append(nodes[LEFT].describe(session, blanks + 1));
sb.append(']');
}
return sb.toString();
}
public HsqlList resolveColumnReferences(Session session,
RangeGroup rangeGroup, int rangeCount, RangeGroup[] rangeGroups,
HsqlList unresolvedSet, boolean acceptsSequences) {
HsqlList conditionSet = nodes[RIGHT].resolveColumnReferences(session,
rangeGroup, rangeCount, rangeGroups, null, false);
if (conditionSet != null) {
ExpressionColumn.checkColumnsResolved(conditionSet);
}
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].getDegree() > 1) {
nodes[LEFT].dataType = new RowType(nodes[LEFT].nodeDataTypes);
}
if (nodes[LEFT].isUnresolvedParam()) {
throw Error.error(ErrorCode.X_42567);
}
if (isDistinctAggregate) {
if (nodes[LEFT].dataType.isLobType()) {
throw Error.error(ErrorCode.X_42534);
}
if (nodes[LEFT].dataType.isCharacterType()) {
arrayType = new ArrayType(nodes[LEFT].dataType,
Integer.MAX_VALUE);
}
}
dataType = SetFunction.getType(session, opType, nodes[LEFT].dataType);
nodes[RIGHT].resolveTypes(session, null);
}
public boolean equals(Expression other) {
if (other instanceof ExpressionAggregate) {
ExpressionAggregate o = (ExpressionAggregate) other;
if (isDistinctAggregate == o.isDistinctAggregate) {
return super.equals(other);
}
}
return false;
}
public Object updateAggregatingValue(Session session, Object currValue) {
if (!nodes[RIGHT].testCondition(session)) {
return currValue;
}
if (currValue == null) {
currValue = new SetFunction(session, opType, nodes[LEFT].dataType,
dataType, isDistinctAggregate,
arrayType);
}
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 ? Long.valueOf(0)
: null;
}
return ((SetFunction) currValue).getValue(session);
}
public Expression getCondition() {
return nodes[RIGHT];
}
public boolean hasCondition() {
return !nodes[RIGHT].isTrue();
}
public void setCondition(Expression e) {
nodes[RIGHT] = e;
}
}
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