/* 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.
*
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* 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
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package org.hsqldb;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.HsqlList;
import org.hsqldb.types.CharacterType;
import org.hsqldb.types.NumberType;
import org.hsqldb.types.Type;
import org.hsqldb.types.Types;
/**
* Implementation of arithmetic and concatenation operations
*
* @author Campbell Boucher-Burnett (boucherb@users dot sourceforge.net)
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 1.9.0
* @since 1.9.0
*/
public class ExpressionArithmetic extends Expression {
ExpressionArithmetic(int type, Expression left, Expression right) {
super(type);
nodes = new Expression[BINARY];
nodes[LEFT] = left;
nodes[RIGHT] = right;
switch (opType) {
case OpTypes.ADD :
case OpTypes.SUBTRACT :
case OpTypes.MULTIPLY :
case OpTypes.DIVIDE :
case OpTypes.CONCAT :
return;
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
}
ExpressionArithmetic(int type, Expression e) {
super(type);
nodes = new Expression[UNARY];
nodes[LEFT] = e;
switch (opType) {
case OpTypes.NEGATE :
return;
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
}
public String getSQL() {
StringBuffer sb = new StringBuffer(64);
switch (opType) {
case OpTypes.VALUE :
if (valueData == null) {
return Tokens.T_NULL;
}
if (dataType == null) {
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
return dataType.convertToSQLString(valueData);
}
String left = getContextSQL(nodes.length > 0 ? nodes[LEFT]
: null);
String right = getContextSQL(nodes.length > 1 ? nodes[RIGHT]
: null);
switch (opType) {
case OpTypes.CAST :
sb.append(' ').append(Tokens.T_CAST).append('(');
sb.append(left).append(' ').append(Tokens.T_AS).append(' ');
sb.append(dataType.getTypeDefinition());
sb.append(')');
break;
case OpTypes.NEGATE :
sb.append('-').append(left);
break;
case OpTypes.ADD :
sb.append(left).append('+').append(right);
break;
case OpTypes.SUBTRACT :
sb.append(left).append('-').append(right);
break;
case OpTypes.MULTIPLY :
sb.append(left).append('*').append(right);
break;
case OpTypes.DIVIDE :
sb.append(left).append('/').append(right);
break;
case OpTypes.CONCAT :
sb.append(left).append("||").append(right);
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.VALUE :
sb.append("VALUE = ").append(valueData);
sb.append(", TYPE = ").append(dataType.getNameString());
return sb.toString();
case OpTypes.ROW :
//
case OpTypes.TABLE :
sb.append("VALUELIST ");
sb.append(" TYPE = ").append(dataType.getNameString());
for (int i = 0; i < nodes.length; i++) {
sb.append(nodes[i].describe(session, blanks + blanks));
sb.append(' ');
}
break;
case OpTypes.NEGATE :
sb.append("NEGATE ");
break;
case OpTypes.ADD :
sb.append("ADD ");
break;
case OpTypes.SUBTRACT :
sb.append("SUBTRACT ");
break;
case OpTypes.MULTIPLY :
sb.append("MULTIPLY ");
break;
case OpTypes.DIVIDE :
sb.append("DIVIDE ");
break;
case OpTypes.CONCAT :
sb.append("CONCAT ");
break;
case OpTypes.CAST :
sb.append("CAST ");
sb.append(dataType.getTypeDefinition());
sb.append(' ');
break;
}
if (nodes[LEFT] != null) {
sb.append(" arg_left=[");
sb.append(nodes[LEFT].describe(session, blanks + 1));
sb.append(']');
}
if (nodes[RIGHT] != null) {
sb.append(" arg_right=[");
sb.append(nodes[RIGHT].describe(session, blanks + 1));
sb.append(']');
}
return sb.toString();
}
public HsqlList resolveColumnReferences(RangeVariable[] rangeVarArray,
int rangeCount, HsqlList unresolvedSet, boolean acceptsSequences) {
if (opType == OpTypes.VALUE) {
return unresolvedSet;
}
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] == null) {
continue;
}
unresolvedSet = nodes[i].resolveColumnReferences(rangeVarArray,
rangeCount, unresolvedSet, acceptsSequences);
}
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);
}
}
switch (opType) {
case OpTypes.VALUE :
break;
case OpTypes.NEGATE :
if (nodes[LEFT].isParam || nodes[LEFT].dataType == null) {
throw Error.error(ErrorCode.X_42567);
}
dataType = nodes[LEFT].dataType;
if (!dataType.isNumberType()) {
throw Error.error(ErrorCode.X_42565);
}
if (nodes[LEFT].opType == OpTypes.VALUE) {
setAsConstantValue(session);
}
break;
case OpTypes.ADD :
// special case for concat using +
if ((nodes[LEFT].dataType != null && nodes[LEFT].dataType
.isCharacterType()) || (nodes[RIGHT].dataType != null
&& nodes[RIGHT].dataType
.isCharacterType())) {
opType = OpTypes.CONCAT;
resolveTypesForConcat(session);
break;
}
// fall through
case OpTypes.SUBTRACT :
case OpTypes.MULTIPLY :
case OpTypes.DIVIDE :
resolveTypesForArithmetic(session);
break;
case OpTypes.CONCAT :
resolveTypesForConcat(session);
break;
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
}
void resolveTypesForArithmetic(Session session) {
if (nodes[LEFT].isParam && nodes[RIGHT].isParam) {
throw Error.error(ErrorCode.X_42567);
}
if (nodes[LEFT].isParam) {
nodes[LEFT].dataType = nodes[RIGHT].dataType;
} else if (nodes[RIGHT].isParam) {
nodes[RIGHT].dataType = nodes[LEFT].dataType;
}
if (nodes[LEFT].dataType == null || nodes[RIGHT].dataType == null) {
throw Error.error(ErrorCode.X_42567);
}
// datetime subtract - type predetermined
if (nodes[LEFT].dataType.isDateTimeType()
&& nodes[RIGHT].dataType.isDateTimeType()) {
if (dataType == null) {
throw Error.error(ErrorCode.X_42566);
} else if (!dataType.isIntervalType()
|| nodes[LEFT].dataType.typeCode
!= nodes[RIGHT].dataType.typeCode) {
throw Error.error(ErrorCode.X_42562);
}
} else {
dataType =
nodes[LEFT].dataType.getCombinedType(nodes[RIGHT].dataType,
opType);
if (dataType.isDateTimeType()) {
if (nodes[LEFT].dataType.isIntervalType()) {
if (opType != OpTypes.ADD) {
throw Error.error(ErrorCode.X_42565);
}
Expression temp = nodes[LEFT];
nodes[LEFT] = nodes[RIGHT];
nodes[RIGHT] = temp;
}
}
}
if (nodes[LEFT].opType == OpTypes.VALUE
&& nodes[RIGHT].opType == OpTypes.VALUE) {
setAsConstantValue(session);
}
}
void resolveTypesForConcat(Session session) {
if (dataType != null) {
return;
}
if (nodes[LEFT].isParam) {
nodes[LEFT].dataType = nodes[RIGHT].dataType;
} else if (nodes[RIGHT].isParam) {
nodes[RIGHT].dataType = nodes[LEFT].dataType;
}
if (nodes[LEFT].dataType == null || nodes[RIGHT].dataType == null) {
throw Error.error(ErrorCode.X_42567);
}
if (nodes[LEFT].dataType.isBinaryType()
^ nodes[RIGHT].dataType.isBinaryType()) {
throw Error.error(ErrorCode.X_42565);
}
// conversion of right argument to character for backward compatibility
if (nodes[LEFT].dataType.isCharacterType()
&& !nodes[RIGHT].dataType.isCharacterType()) {
Type newType = CharacterType.getCharacterType(Types.SQL_VARCHAR,
nodes[RIGHT].dataType.displaySize());
nodes[RIGHT] = ExpressionOp.getCastExpression(session,
nodes[RIGHT], newType);
}
if (nodes[RIGHT].dataType.isCharacterType()
&& !nodes[LEFT].dataType.isCharacterType()) {
Type newType = CharacterType.getCharacterType(Types.SQL_VARCHAR,
nodes[LEFT].dataType.displaySize());
nodes[LEFT] = ExpressionOp.getCastExpression(session, nodes[LEFT],
newType);
}
dataType = nodes[LEFT].dataType.getCombinedType(nodes[RIGHT].dataType,
OpTypes.CONCAT);
if (nodes[LEFT].opType == OpTypes.VALUE
&& nodes[RIGHT].opType == OpTypes.VALUE) {
setAsConstantValue(session);
}
}
public Object getValue(Session session) {
switch (opType) {
case OpTypes.VALUE :
return valueData;
case OpTypes.SIMPLE_COLUMN : {
Object[] data =
(Object[]) session.sessionContext
.rangeIterators[rangePosition].getCurrent();
return data[columnIndex];
}
case OpTypes.NEGATE :
return ((NumberType) dataType).negate(
nodes[LEFT].getValue(session, nodes[LEFT].dataType));
}
Object a = nodes[LEFT].getValue(session);
Object b = nodes[RIGHT].getValue(session);
switch (opType) {
case OpTypes.ADD :
return dataType.add(a, b, nodes[RIGHT].dataType);
case OpTypes.SUBTRACT :
return dataType.subtract(a, b, nodes[RIGHT].dataType);
case OpTypes.MULTIPLY :
return dataType.multiply(a, b);
case OpTypes.DIVIDE :
return dataType.divide(a, b);
case OpTypes.CONCAT :
return dataType.concat(session, a, b);
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
}
}
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