package com.sun.xml.xsom.impl.scd;
import com.sun.xml.xsom.SCD;
import com.sun.xml.xsom.XSComponent;
import java.util.Iterator;
/**
* Schema component designator.
*
* @author Kohsuke Kawaguchi
*/
public final class SCDImpl extends SCD {
/**
* SCD is fundamentally a list of steps.
*/
private final Step[] steps;
/**
* The original textual SCD representation.
*/
private final String text;
public SCDImpl(String text, Step[] steps) {
this.text = text;
this.steps = steps;
}
public Iterator<XSComponent> select(Iterator<? extends XSComponent> contextNode) {
Iterator<XSComponent> nodeSet = (Iterator)contextNode;
int len = steps.length;
for( int i=0; i<len; i++ ) {
if(i!=0 && i!=len-1 && !steps[i-1].axis.isModelGroup() && steps[i].axis.isModelGroup()) {
// expand the current nodeset by adding abbreviatable complex type and model groups.
// note that such expansion is not allowed to occure in in between model group axes.
// TODO: this step is not needed if the next step is known not to react to
// complex type nor model groups, such as, say Axis.FACET
nodeSet = new Iterators.Unique<XSComponent>(
new Iterators.Map<XSComponent,XSComponent>(nodeSet) {
protected Iterator<XSComponent> apply(XSComponent u) {
return new Iterators.Union<XSComponent>(
Iterators.singleton(u),
Axis.INTERMEDIATE_SKIP.iterator(u) );
}
}
);
}
nodeSet = steps[i].evaluate(nodeSet);
}
return nodeSet;
}
public String toString() {
return text;
}
}