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package com.sun.tools.xjc.reader.xmlschema;
import java.util.HashMap;
import java.util.Map;
import javax.xml.bind.annotation.XmlAnyElement;
import javax.xml.namespace.QName;
import com.sun.tools.xjc.reader.gbind.Choice;
import com.sun.tools.xjc.reader.gbind.Element;
import com.sun.tools.xjc.reader.gbind.Expression;
import com.sun.tools.xjc.reader.gbind.OneOrMore;
import com.sun.tools.xjc.reader.gbind.Sequence;
import com.sun.xml.xsom.XSElementDecl;
import com.sun.xml.xsom.XSModelGroup;
import com.sun.xml.xsom.XSModelGroupDecl;
import com.sun.xml.xsom.XSParticle;
import com.sun.xml.xsom.XSWildcard;
import com.sun.xml.xsom.visitor.XSTermFunction;
/**
* Visits {@link XSParticle} and creates a corresponding {@link Expression} tree.
* @author Kohsuke Kawaguchi
*/
public final class ExpressionBuilder implements XSTermFunction<Expression> {
public static Expression createTree(XSParticle p) {
return new ExpressionBuilder().particle(p);
}
private ExpressionBuilder() {}
/**
* Wildcard instance needs to be consolidated to one,
* and this is such instance (if any.)
*/
private GWildcardElement wildcard = null;
private final Map<QName,GElementImpl> decls = new HashMap<QName,GElementImpl>();
private XSParticle current;
/**
* We can only have one {@link XmlAnyElement} property,
* so all the wildcards need to be treated as one node.
*/
public Expression wildcard(XSWildcard wc) {
if(wildcard==null)
wildcard = new GWildcardElement();
wildcard.merge(wc);
wildcard.particles.add(current);
return wildcard;
}
public Expression modelGroupDecl(XSModelGroupDecl decl) {
return modelGroup(decl.getModelGroup());
}
public Expression modelGroup(XSModelGroup group) {
XSModelGroup.Compositor comp = group.getCompositor();
if(comp==XSModelGroup.CHOICE) {
// empty choice is not epsilon, but empty set,
// so this initial value is incorrect. But this
// kinda works.
// properly handling empty set requires more work.
Expression e = Expression.EPSILON;
for (XSParticle p : group.getChildren()) {
if(e==null) e = particle(p);
else e = new Choice(e,particle(p));
}
return e;
} else {
Expression e = Expression.EPSILON;
for (XSParticle p : group.getChildren()) {
if(e==null) e = particle(p);
else e = new Sequence(e,particle(p));
}
return e;
}
}
public Element elementDecl(XSElementDecl decl) {
QName n = BGMBuilder.getName(decl);
GElementImpl e = decls.get(n);
if(e==null)
decls.put(n,e=new GElementImpl(n,decl));
e.particles.add(current);
assert current.getTerm()==decl;
return e;
}
public Expression particle(XSParticle p) {
current = p;
Expression e = p.getTerm().apply(this);
if(p.isRepeated())
e = new OneOrMore(e);
if(p.getMinOccurs()==0)
e = new Choice(e,Expression.EPSILON);
return e;
}
}