/* 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
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package org.hsqldb_voltpatches;
import org.hsqldb_voltpatches.types.BinaryData;
import org.hsqldb_voltpatches.types.Type;
// End VoltDB extension
/**
* Implementation of value access 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 ExpressionValue extends Expression {
/**
* Creates a VALUE expression
*/
ExpressionValue(Object o, Type datatype) {
super(OpTypes.VALUE);
nodes = Expression.emptyExpressionArray;
dataType = datatype;
valueData = o;
}
@Override
public String getSQL() {
switch (opType) {
case OpTypes.VALUE :
if (valueData == null) {
return Tokens.T_NULL;
}
return dataType.convertToSQLString(valueData);
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
}
@Override
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();
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
}
@Override
public Object getValue(Session session) {
return valueData;
}
// A VoltDB extension to allow X'..' as numeric literals
/**
* Given a ExpressionValue that is a VARBINARY constant,
* convert it to a BIGINT constant. Returns true for a
* successful conversion and false otherwise.
*
* For more details on how the conversion is performed, see BinaryData.toLong().
*
* @param parent Reference of parent expression
* @param childIndex Index of this node in parent
* @return true for a successful conversion and false otherwise.
*/
public static boolean voltMutateToBigintType(Expression maybeConstantNode, Expression parent, int childIndex) {
if (maybeConstantNode.opType == OpTypes.VALUE
&& maybeConstantNode.dataType != null
&& maybeConstantNode.dataType.isBinaryType()) {
ExpressionValue exprVal = (ExpressionValue)maybeConstantNode;
if (exprVal.valueData == null) {
return false;
}
BinaryData data = (BinaryData)exprVal.valueData;
parent.nodes[childIndex] = new ExpressionValue(data.toLong(), Type.SQL_BIGINT);
return true;
}
return false;
}
// End VoltDB extension
}