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package com.sun.tools.internal.xjc.reader.xmlschema;

import java.util.Collection;

import com.sun.tools.internal.xjc.model.CPropertyInfo;
import com.sun.tools.internal.xjc.model.Multiplicity;
import com.sun.tools.internal.xjc.reader.RawTypeSet;
import com.sun.tools.internal.xjc.reader.gbind.ConnectedComponent;
import com.sun.tools.internal.xjc.reader.gbind.Element;
import com.sun.tools.internal.xjc.reader.gbind.Expression;
import com.sun.tools.internal.xjc.reader.gbind.Graph;
import com.sun.tools.internal.xjc.reader.xmlschema.bindinfo.BIProperty;
import com.sun.xml.internal.bind.v2.model.core.WildcardMode;
import com.sun.xml.internal.xsom.XSParticle;

ParticleBinder that uses ExpressionBuilder et al for better, more intuitive (but non spec-conforming) binding. 
Author:
Kohsuke Kawaguchi/**
 * {@link ParticleBinder} that uses {@link ExpressionBuilder} et al
 * for better, more intuitive (but non spec-conforming) binding.
 *
 * @author Kohsuke Kawaguchi
 */
final class ExpressionParticleBinder extends ParticleBinder {
    public void build(XSParticle p, Collection<XSParticle> forcedProps) {
        // this class isn't about spec conformance, but
        // for the ease of use.
        // so we don't give a damn about 'forcedProps'.
        // although, for a future note, it's conceivable to expand
        // the binding algorithm to cover this notion.

        Expression tree = ExpressionBuilder.createTree(p);
        Graph g = new Graph(tree);
        for (ConnectedComponent cc : g) {
            buildProperty(cc);
        }
    }

    
Builds a property ouf ot a connected component.
/**
     * Builds a property ouf ot a connected component.
     */
    private void buildProperty(ConnectedComponent cc) {
        StringBuilder propName = new StringBuilder(); // property name
        int nameTokenCount = 0; // combine only up to 3

        RawTypeSetBuilder rtsb = new RawTypeSetBuilder();
        for (Element e : cc) {
            GElement ge = (GElement)e;

            if(nameTokenCount<3) {
                if(nameTokenCount!=0)
                    propName.append("And");
                propName.append(makeJavaName(cc.isCollection(),ge.getPropertyNameSeed()));
                nameTokenCount++;
            }

            if(e instanceof GElementImpl) {
                GElementImpl ei = (GElementImpl) e;
                rtsb.elementDecl(ei.decl);
                continue;
            }
            if(e instanceof GWildcardElement) {
                GWildcardElement w = (GWildcardElement)e;
                rtsb.getRefs().add(new RawTypeSetBuilder.WildcardRef(
                    w.isStrict() ? WildcardMode.STRICT : WildcardMode.SKIP));
                continue;
            }
            assert false : e;   // no other kind should be here
        }

        Multiplicity m = Multiplicity.ONE;
        if(cc.isCollection())
            m = m.makeRepeated();
        if(!cc.isRequired())
            m = m.makeOptional();

        RawTypeSet rts = new RawTypeSet(rtsb.getRefs(),m);

        XSParticle p = findSourceParticle(cc);

        BIProperty cust = BIProperty.getCustomization(p);
        CPropertyInfo prop = cust.createElementOrReferenceProperty(
            propName.toString(), false, p, rts );
        getCurrentBean().addProperty(prop);
    }

    
Finds a XSParticle that can serve as the representative property of the given ConnectedComponent. The representative property is used for reporting an error location and taking BIProperty customization. Right now, the algorithm is just pick the first one with BIProperty, but one can think of a better algorithm, such as taking a choice of (A|B) if CC={A,B}. /**
     * Finds a {@link XSParticle} that can serve as the representative property of
     * the given {@link ConnectedComponent}.
     *
     * The representative property is used for reporting an error location and
     * taking {@link BIProperty} customization. Right now, the algorithm is just pick
     * the first one with {@link BIProperty}, but one can think of a better algorithm,
     * such as taking a choice of (A|B) if CC={A,B}.
     */
    private XSParticle findSourceParticle(ConnectedComponent cc) {
        XSParticle first = null;

        for (Element e : cc) {
            GElement ge = (GElement)e;
            for (XSParticle p : ge.particles) {
                if(first==null)
                    first = p;
                if(getLocalPropCustomization(p)!=null)
                    return p;
            }
            // if there are multiple property customizations,
            // all but one will be left unused, which will be detected as an error
            // later, so no need to check that now.
        }

        // if no customization was found, just use the first one.
        return first;
    }

    public boolean checkFallback(XSParticle p) {
        // this algorithm never falls back to 'getContent'.
        return false;
    }
}