package org.hsqldb;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.HsqlList;
import org.hsqldb.types.Type;
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];
}
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() {
StringBuilder sb = new StringBuilder(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) {
StringBuilder sb = new StringBuilder(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();
}
}