package org.exist.xquery;
import org.exist.xquery.util.ExpressionDumper;
import org.exist.xquery.value.Item;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceIterator;
import org.exist.xquery.value.ValueSequence;
/**
* Implements the XQuery 3.0 simple map operator "!".
*/
public class OpSimpleMap extends AbstractExpression {
private Expression left;
private PathExpr right;
public OpSimpleMap(XQueryContext context, PathExpr left, PathExpr right) {
super(context);
this.left = left;
this.right = right;
}
@Override
public void analyze(AnalyzeContextInfo contextInfo) throws XPathException {
final AnalyzeContextInfo contextCopy = new AnalyzeContextInfo(contextInfo);
left.analyze(contextCopy);
right.analyze(contextCopy);
}
@Override
public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathException {
if (contextItem != null)
{contextSequence = contextItem.toSequence();}
final Sequence leftSeq = left.eval(contextSequence);
if (leftSeq.isEmpty())
{return Sequence.EMPTY_SEQUENCE;}
final ValueSequence result = new ValueSequence();
int pos = 0;
for (final SequenceIterator i = leftSeq.iterate(); i.hasNext(); pos++) {
context.setContextSequencePosition(pos, leftSeq);
final Sequence rightSeq = right.eval(i.nextItem().toSequence());
result.addAll(rightSeq);
}
return result;
}
@Override
public int returnsType() {
return right.returnsType();
}
@Override
public int getCardinality() {
return Cardinality.ZERO_OR_MORE;
}
@Override
public void dump(ExpressionDumper dumper) {
left.dump(dumper);
dumper.display(" ! ");
right.dump(dumper);
}
}