package org.exist.xquery;
import org.exist.xquery.util.Error;
import org.exist.xquery.value.*;
public class ConcatExpr extends PathExpr {
public ConcatExpr(XQueryContext context) {
super(context);
}
@Override
public void analyze(AnalyzeContextInfo contextInfo) throws XPathException {
if(getContext().getXQueryVersion() < 30){
throw new XPathException(this, ErrorCodes.EXXQDY0003,
"string concatenation operator is not available before XQuery 3.0");
}
super.analyze(contextInfo);
}
@Override
public void add(PathExpr pathExpr) {
Expression expr = new DynamicCardinalityCheck(context, Cardinality.ZERO_OR_ONE, pathExpr,
new Error(Error.FUNC_PARAM_CARDINALITY));
if (!Type.subTypeOf(expr.returnsType(), Type.ATOMIC))
{expr = new Atomize(context, expr);}
super.add(expr);
}
@Override
public Sequence eval(Sequence contextSequence, Item contextItem)
throws XPathException {
if (context.getProfiler().isEnabled()) {
context.getProfiler().start(this);
context.getProfiler().message(this, Profiler.DEPENDENCIES, "DEPENDENCIES", Dependency.getDependenciesName(this.getDependencies()));
if (contextSequence != null)
{context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT SEQUENCE", contextSequence);}
if (contextItem != null)
{context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT ITEM", contextItem.toSequence());}
}
final StringBuilder concat = new StringBuilder();
for(final Expression step : steps) {
final Sequence seq = step.eval(contextSequence, contextItem);
for (final SequenceIterator i = seq.iterate(); i.hasNext(); ) {
final Item item = i.nextItem();
if (Type.subTypeOf(item.getType(), Type.FUNCTION_REFERENCE))
{throw new XPathException(this, ErrorCodes.FOTY0013, "Got a function item as operand in string concatenation");}
concat.append(item.getStringValue());
}
}
final StringValue result = new StringValue(concat.toString());
if (context.getProfiler().isEnabled())
{context.getProfiler().end(this, "", result);}
return result;
}
@Override
public int returnsType() {
return Type.STRING;
}
@Override
public int getCardinality() {
return Cardinality.EXACTLY_ONE;
}
}