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HSQLDB - Lightweight 100% Java SQL Database Engine
/* Copyright (c) 2001-2019, 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.HsqlList;
import org.hsqldb.types.CharacterType;
import org.hsqldb.types.Type;
import org.hsqldb.types.Types;
/**
* Implementation of arithmetic and concatenation operations
*
* @author Campbell Burnet (campbell-burnet@users dot sourceforge.net)
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.5
* @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() {
StringBuilder sb = new StringBuilder(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) {
StringBuilder sb = new StringBuilder(64);
sb.append('\n');
for (int i = 0; i < blanks; i++) {
sb.append(' ');
}
switch (opType) {
case OpTypes.VALUE :
sb.append("VALUE = ").append(
dataType.convertToSQLString(valueData));
sb.append(", TYPE = ").append(dataType.getNameString());
return sb.toString();
case OpTypes.ROW :
//
case OpTypes.VALUELIST :
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;
default :
}
if (getLeftNode() != null) {
sb.append(" arg_left=[");
sb.append(nodes[LEFT].describe(session, blanks + 1));
sb.append(']');
}
if (getRightNode() != null) {
sb.append(" arg_right=[");
sb.append(nodes[RIGHT].describe(session, blanks + 1));
sb.append(']');
}
return sb.toString();
}
public HsqlList resolveColumnReferences(Session session,
RangeGroup rangeGroup, int rangeCount, RangeGroup[] rangeGroups,
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(session,
rangeGroup, rangeCount, rangeGroups, 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].isUnresolvedParam()
|| nodes[LEFT].dataType == null) {
throw Error.error(ErrorCode.X_42567);
}
dataType = nodes[LEFT].dataType;
if (!dataType.isNumberType()) {
throw Error.error(ErrorCode.X_42563);
}
if (nodes[LEFT].opType == OpTypes.VALUE) {
setAsConstantValue(session, parent);
}
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, parent);
break;
}
// fall through
case OpTypes.SUBTRACT :
case OpTypes.MULTIPLY :
case OpTypes.DIVIDE :
resolveTypesForArithmetic(session, parent);
break;
case OpTypes.CONCAT :
resolveTypesForConcat(session, parent);
break;
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
}
void resolveTypesForArithmetic(Session session, Expression parent) {
if (nodes[LEFT].isUnresolvedParam()
&& nodes[RIGHT].isUnresolvedParam()) {
if (parent instanceof ExpressionLogical) {
Expression e = parent.nodes[LEFT];
if (e == this) {
e = parent.nodes[RIGHT];
}
if (e.dataType != null) {
if (e.dataType.isDateOrTimestampType()) {
nodes[LEFT].dataType = e.dataType;
}
}
}
}
if (nodes[LEFT].isUnresolvedParam()
&& nodes[RIGHT].isUnresolvedParam()) {
nodes[LEFT].dataType = Type.SQL_INTEGER;
nodes[RIGHT].dataType = Type.SQL_INTEGER;
}
if (nodes[LEFT].dataType == null && nodes[RIGHT].dataType == null) {
nodes[LEFT].dataType = Type.SQL_INTEGER;
nodes[RIGHT].dataType = Type.SQL_INTEGER;
}
if (nodes[LEFT].isUnresolvedParam()) {
if (nodes[RIGHT].dataType == null) {
throw Error.error(ErrorCode.X_42567);
}
if (nodes[RIGHT].dataType.isIntervalType()) {
if (parent != null) {
switch (parent.opType) {
case OpTypes.EQUAL :
case OpTypes.GREATER_EQUAL :
case OpTypes.SMALLER_EQUAL :
case OpTypes.SMALLER :
case OpTypes.GREATER :
for (int i = 0; i < parent.nodes.length; i++) {
if (parent.nodes[i] != this) {
if (parent.nodes[i].dataType != null
&& parent.nodes[i].dataType
.isDateTimeType()) {
nodes[LEFT].dataType =
parent.nodes[i].dataType;
}
break;
}
}
break;
default :
}
}
}
if (nodes[LEFT].dataType == null) {
switch (opType) {
case OpTypes.SUBTRACT :
if (nodes[RIGHT].dataType.isIntervalType()) {
nodes[LEFT].dataType =
Type.SQL_TIMESTAMP_WITH_TIME_ZONE;
}
break;
case OpTypes.ADD :
if (nodes[RIGHT].dataType.isDateTimeType()) {
if (nodes[RIGHT].dataType.typeComparisonGroup
== Types.SQL_DATE) {
nodes[LEFT].dataType =
Type
.SQL_INTERVAL_YEAR_TO_MONTH_MAX_PRECISION;
} else {
nodes[LEFT].dataType =
Type
.SQL_INTERVAL_DAY_TO_SECOND_MAX_PRECISION;
}
} else if (nodes[RIGHT].dataType.isIntervalType()) {
nodes[LEFT].dataType =
Type.SQL_TIMESTAMP_WITH_TIME_ZONE;
}
break;
default :
}
}
if (nodes[LEFT].dataType == null) {
nodes[LEFT].dataType = nodes[RIGHT].dataType;
}
} else if (nodes[RIGHT].isUnresolvedParam()) {
if (nodes[LEFT].dataType == null) {
throw Error.error(ErrorCode.X_42567);
}
switch (opType) {
case OpTypes.MULTIPLY :
case OpTypes.DIVIDE :
if (nodes[LEFT].dataType.isIntervalType()) {
nodes[RIGHT].dataType = Type.SQL_DECIMAL;
} else {
nodes[RIGHT].dataType = nodes[LEFT].dataType;
}
break;
case OpTypes.SUBTRACT :
case OpTypes.ADD :
if (nodes[LEFT].dataType.isDateTimeType()) {
// datetime subtract - type predetermined
if (dataType != null && dataType.isIntervalType()) {
nodes[RIGHT].dataType = nodes[LEFT].dataType;
} else if (nodes[LEFT].dataType.typeComparisonGroup
== Types.SQL_DATE) {
nodes[RIGHT].dataType =
Type.SQL_INTERVAL_YEAR_TO_MONTH_MAX_PRECISION;
} else {
nodes[RIGHT].dataType =
Type.SQL_INTERVAL_DAY_TO_SECOND_MAX_PRECISION;
}
} else {
nodes[RIGHT].dataType = nodes[LEFT].dataType;
}
break;
}
}
if (nodes[LEFT].dataType == null || nodes[RIGHT].dataType == null) {
throw Error.error(ErrorCode.X_42567);
}
if (opType == OpTypes.SUBTRACT) {
if (nodes[LEFT].dataType.isDateTimeType()
&& nodes[RIGHT].dataType.isDateTimeType()) {
if (nodes[LEFT].dataType.isDateTimeTypeWithZone()
^ nodes[RIGHT].dataType.isDateTimeTypeWithZone()) {
if (nodes[LEFT].dataType.isDateTimeTypeWithZone()) {
nodes[LEFT] = new ExpressionOp(nodes[LEFT]);
}
if (nodes[RIGHT].dataType.isDateTimeTypeWithZone()) {
nodes[RIGHT] = new ExpressionOp(nodes[RIGHT]);
}
}
}
}
// datetime subtract - type predetermined
if (dataType != null) {
if (dataType.isIntervalType()) {
if (nodes[LEFT].dataType.isDateTimeType()
&& nodes[RIGHT].dataType.isDateTimeType()) {
if (nodes[LEFT].dataType.typeComparisonGroup
!= nodes[RIGHT].dataType.typeComparisonGroup) {
throw Error.error(ErrorCode.X_42562);
}
} else {
Type type = nodes[LEFT].dataType.getCombinedType(session,
nodes[RIGHT].dataType, opType);
if (type == null) {
throw Error.error(ErrorCode.X_42562);
}
if (type.isIntervalType()) {
if (type.typeCode != dataType.typeCode) {
throw Error.error(ErrorCode.X_42562);
}
} else if (type.isNumberType()) {
nodes[LEFT] = new ExpressionOp(nodes[LEFT], dataType);
nodes[RIGHT] = new ExpressionOp(nodes[RIGHT],
dataType);
nodes[LEFT].resolveTypes(session, this);
nodes[RIGHT].resolveTypes(session, this);
} else {
throw Error.error(ErrorCode.X_42562);
}
}
}
} else {
dataType = nodes[LEFT].dataType.getCombinedType(session,
nodes[RIGHT].dataType, opType);
if (dataType.isDateTimeType()) {
if (nodes[LEFT].dataType.isIntervalType()) {
if (opType != OpTypes.ADD) {
throw Error.error(ErrorCode.X_42563);
}
Expression temp = nodes[LEFT];
nodes[LEFT] = nodes[RIGHT];
nodes[RIGHT] = temp;
} else if (nodes[RIGHT].dataType.isNumberType()) {
if (!session.database.sqlSyntaxOra) {
throw Error.error(ErrorCode.X_42562);
}
}
}
}
if (nodes[LEFT].opType == OpTypes.VALUE
&& nodes[RIGHT].opType == OpTypes.VALUE) {
setAsConstantValue(session, parent);
}
}
void resolveTypesForConcat(Session session, Expression parent) {
if (dataType != null) {
return;
}
if (nodes[LEFT].isUnresolvedParam()) {
nodes[LEFT].dataType = getParameterType(nodes[RIGHT].dataType);
} else if (nodes[RIGHT].isUnresolvedParam()) {
nodes[RIGHT].dataType = getParameterType(nodes[LEFT].dataType);
}
if (nodes[LEFT].dataType == null) {
nodes[LEFT].dataType = Type.SQL_VARCHAR_DEFAULT;
}
if (nodes[RIGHT].dataType == null) {
nodes[RIGHT].dataType = Type.SQL_VARCHAR_DEFAULT;
}
if (nodes[LEFT].dataType.isBinaryType()
^ nodes[RIGHT].dataType.isBinaryType()) {
throw Error.error(ErrorCode.X_42563);
}
if (nodes[LEFT].dataType.isArrayType()) {
Expression e = nodes[RIGHT];
if (e.opType == OpTypes.ARRAY_ACCESS) {
if (parent == null) {
throw Error.error(ErrorCode.X_42563);
}
nodes[RIGHT] = e.getLeftNode();
e.nodes[LEFT] = this;
parent.replaceNode(this, e);
}
}
if (nodes[LEFT].dataType.isArrayType()
^ nodes[RIGHT].dataType.isArrayType()) {
throw Error.error(ErrorCode.X_42563);
}
// conversion of right argument to character for backward compatibility
if (nodes[LEFT].dataType.isCharacterType()
&& !nodes[RIGHT].dataType.isCharacterType()) {
if (session.database.sqlEnforceTypes) {
throw Error.error(ErrorCode.X_42562);
}
Type newType = CharacterType.getCharacterType(Types.SQL_VARCHAR,
nodes[RIGHT].dataType.displaySize(),
nodes[LEFT].dataType.getCollation());
nodes[RIGHT] = ExpressionOp.getCastExpression(session,
nodes[RIGHT], newType);
}
if (nodes[RIGHT].dataType.isCharacterType()
&& !nodes[LEFT].dataType.isCharacterType()) {
if (session.database.sqlEnforceTypes) {
throw Error.error(ErrorCode.X_42562);
}
Type newType = CharacterType.getCharacterType(Types.SQL_VARCHAR,
nodes[LEFT].dataType.displaySize(),
nodes[RIGHT].dataType.getCollation());
nodes[LEFT] = ExpressionOp.getCastExpression(session, nodes[LEFT],
newType);
}
dataType = nodes[LEFT].dataType.getCombinedType(session,
nodes[RIGHT].dataType, OpTypes.CONCAT);
if (nodes[LEFT].opType == OpTypes.VALUE
&& nodes[RIGHT].opType == OpTypes.VALUE) {
setAsConstantValue(session, parent);
}
}
private Type getParameterType(Type type) {
if (type == null) {
return null;
}
switch (type.typeCode) {
case Types.SQL_CHAR :
case Types.SQL_VARCHAR :
return Type.SQL_VARCHAR_DEFAULT;
case Types.SQL_CLOB :
return Type.SQL_CLOB;
case Types.SQL_BINARY :
case Types.SQL_VARBINARY :
return Type.SQL_VARBINARY_DEFAULT;
case Types.SQL_BLOB :
return Type.SQL_BLOB;
case Types.SQL_BIT :
case Types.SQL_BIT_VARYING :
return Type.SQL_BIT_VARYING_MAX_LENGTH;
case Types.SQL_ARRAY :
return type;
default :
return null;
}
}
public Object getValue(Session session) {
switch (opType) {
case OpTypes.VALUE :
return valueData;
case OpTypes.NEGATE :
return 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(session, a, b, nodes[RIGHT].dataType);
case OpTypes.SUBTRACT :
return dataType.subtract(session, a, b, nodes[RIGHT].dataType);
case OpTypes.MULTIPLY :
return dataType.multiply(a, b);
case OpTypes.DIVIDE :
return dataType.divide(session, a, b);
case OpTypes.CONCAT :
if (!session.database.sqlConcatNulls
&& nodes[LEFT].dataType.isCharacterType()) {
if (a == null && b != null) {
a = "";
} else if (a != null && b == null) {
b = "";
}
}
return dataType.concat(session, a, b);
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
}
}