/* Copyright (c) 2001-2011, 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.
Type;
/**
* database object component access
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.0.1
* @since 2.0.0
*/
public class
ExpressionAccessor extends
Expression {
ExpressionAccessor(
Expression left,
Expression right) {
super(
OpTypes.
ARRAY_ACCESS);
nodes = new
Expression[] {
left,
right
};
}
public
ColumnSchema getColumn() {
return
nodes[
LEFT].
getColumn();
}
public
HsqlList resolveColumnReferences(
Session session,
RangeGroup rangeGroup, int
rangeCount,
RangeGroup[]
rangeGroups,
HsqlList unresolvedSet, boolean
acceptsSequences) {
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);
}
}
if (
nodes[
LEFT].
dataType == null) {
throw
Error.
error(
ErrorCode.
X_42567);
}
if (!
nodes[
LEFT].
dataType.
isArrayType()) {
throw
Error.
error(
ErrorCode.
X_42563);
}
dataType =
nodes[
LEFT].
dataType.
collectionBaseType();
if (
nodes[
RIGHT].
opType ==
OpTypes.
DYNAMIC_PARAM) {
nodes[
RIGHT].
dataType =
Type.
SQL_INTEGER;
}
}
public
Object getValue(
Session session) {
Object[]
array = (
Object[])
nodes[
LEFT].
getValue(
session);
if (
array == null) {
return null;
}
Number index = (
Number)
nodes[
RIGHT].
getValue(
session);
if (
index == null) {
return null;
}
if (
index.
intValue() < 1 ||
index.
intValue() >
array.length) {
throw
Error.
error(
ErrorCode.
X_2202E);
}
return
array[
index.
intValue() - 1];
}
/**
* Assignment result
*/
public
Object[]
getUpdatedArray(
Session session,
Object[]
array,
Object value, boolean
copy) {
if (
array == null) {
throw
Error.
error(
ErrorCode.
X_2200E);
}
Number index = (
Number)
nodes[
RIGHT].
getValue(
session);
if (
index == null) {
throw
Error.
error(
ErrorCode.
X_2202E);
}
int
i =
index.
intValue() - 1;
if (
i < 0) {
throw
Error.
error(
ErrorCode.
X_2202E);
}
if (
i >=
nodes[
LEFT].
dataType.
arrayLimitCardinality()) {
throw
Error.
error(
ErrorCode.
X_2202E);
}
Object[]
newArray =
array;
if (
i >=
array.length) {
newArray = new
Object[
i + 1];
System.
arraycopy(
array, 0,
newArray, 0,
array.length);
} else if (
copy) {
newArray = new
Object[
array.length];
System.
arraycopy(
array, 0,
newArray, 0,
array.length);
}
newArray[
i] =
value;
return
newArray;
}
public
String getSQL() {
StringBuffer sb = new
StringBuffer(64);
String left =
getContextSQL(
nodes[
LEFT]);
sb.
append(
left).
append('[');
sb.
append(
nodes[
RIGHT].
getSQL()).
append(']');
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(' ');
}
sb.
append("ARRAY ACCESS");
if (
getLeftNode() != null) {
sb.
append(" array=[");
sb.
append(
nodes[
LEFT].
describe(
session,
blanks + 1));
sb.
append(']');
}
if (
getRightNode() != null) {
sb.
append(" array_index=[");
sb.
append(
nodes[
RIGHT].
describe(
session,
blanks + 1));
sb.
append(']');
}
return
sb.
toString();
}
}