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package com.sun.xml.xsom.impl.scd;
import com.sun.xml.xsom.XSComponent;
import com.sun.xml.xsom.XSDeclaration;
import com.sun.xml.xsom.XSFacet;
import com.sun.xml.xsom.XSType;
import com.sun.xml.xsom.SCD;
import com.sun.xml.xsom.XSSchema;
import com.sun.xml.xsom.impl.UName;
import java.util.Iterator;
/**
* Building block of {@link SCD}.
*
* @author Kohsuke Kawaguchi
*/
public abstract class Step<T extends XSComponent> {
public final Axis<? extends T> axis;
/**
* 'Predicate' in SCD designates the index of the item. -1 if there's no predicate.
* Predicate starts from 1.
*
* <p>
* Because of the parsing order this parameter cannot be marked
* final, even though it's immutable once it's parsed.
*/
int predicate = -1;
protected Step(Axis<? extends T> axis) {
this.axis = axis;
}
/**
* Perform filtering (which is different depending on the kind of step.)
*/
protected abstract Iterator<? extends T> filter( Iterator<? extends T> base );
/**
* Evaluate this step against the current node set
* and returns matched nodes.
*/
public final Iterator<T> evaluate(Iterator<XSComponent> nodeSet) {
// list up the whole thing
Iterator<T> r = new Iterators.Map<T,XSComponent>(nodeSet) {
protected Iterator<? extends T> apply(XSComponent contextNode) {
return filter(axis.iterator(contextNode));
}
};
// avoid duplicates
r = new Iterators.Unique<T>(r);
if(predicate>=0) {
T item=null;
for( int i=predicate; i>0; i-- ) {
if(!r.hasNext())
return Iterators.empty();
item = r.next();
}
return new Iterators.Singleton<T>(item);
}
return r;
}
/**
* Matches any name.
*/
static final class Any extends Step<XSComponent> {
public Any(Axis<? extends XSComponent> axis) {
super(axis);
}
// no filtering.
protected Iterator<? extends XSComponent> filter(Iterator<? extends XSComponent> base) {
return base;
}
}
private static abstract class Filtered<T extends XSComponent> extends Step<T> {
protected Filtered(Axis<? extends T> axis) {
super(axis);
}
protected Iterator<T> filter(Iterator<? extends T> base) {
return new Iterators.Filter<T>(base) {
protected boolean matches(T d) {
return match(d);
}
};
}
protected abstract boolean match(T d);
}
/**
* Matches a particular name.
*/
static final class Named extends Filtered<XSDeclaration> {
private final String nsUri;
private final String localName;
public Named(Axis<? extends XSDeclaration> axis, UName n) {
this(axis,n.getNamespaceURI(),n.getName());
}
public Named(Axis<? extends XSDeclaration> axis, String nsUri, String localName) {
super(axis);
this.nsUri = nsUri;
this.localName = localName;
}
protected boolean match(XSDeclaration d) {
return d.getName().equals(localName) && d.getTargetNamespace().equals(nsUri);
}
}
/**
* Matches anonymous types.
*/
static final class AnonymousType extends Filtered<XSType> {
public AnonymousType(Axis<? extends XSType> axis) {
super(axis);
}
protected boolean match(XSType node) {
return node.isLocal();
}
}
/**
* Matches a particular kind of facets.
*/
static final class Facet extends Filtered<XSFacet> {
private final String name;
public Facet(Axis<XSFacet> axis, String facetName) {
super(axis);
this.name = facetName;
}
protected boolean match(XSFacet f) {
return f.getName().equals(name);
}
}
/**
* Matches a schema in a particular namespace.
*/
static final class Schema extends Filtered<XSSchema> {
private final String uri;
public Schema(Axis<XSSchema> axis, String uri) {
super(axis);
this.uri = uri;
}
protected boolean match(XSSchema d) {
return d.getTargetNamespace().equals(uri);
}
}
}