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 * accompanied this code).

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

import java.math.BigInteger;

import com.sun.tools.internal.xjc.model.Multiplicity;

import com.sun.xml.internal.xsom.XSElementDecl;

import com.sun.xml.internal.xsom.XSModelGroup;

import com.sun.xml.internal.xsom.XSModelGroupDecl;

import com.sun.xml.internal.xsom.XSParticle;

import com.sun.xml.internal.xsom.XSWildcard;

import com.sun.xml.internal.xsom.visitor.XSTermFunction;

import static com.sun.tools.internal.xjc.model.Multiplicity.ONE;

import static com.sun.tools.internal.xjc.model.Multiplicity.ZERO;

/**

 * Counts {@link Multiplicity} for a particle/term.

 *

 * @author Kohsuke Kawaguchi

 */

public final class MultiplicityCounter implements XSTermFunction<Multiplicity> {

    public static final MultiplicityCounter theInstance = new MultiplicityCounter();

    private MultiplicityCounter() {}

    public Multiplicity particle( XSParticle p ) {

        Multiplicity m = p.getTerm().apply(this);

        BigInteger max;

        if (m.max==null || (BigInteger.valueOf(XSParticle.UNBOUNDED).equals(p.getMaxOccurs())))

            max=null;

        else

            max=p.getMaxOccurs();

        return Multiplicity.multiply( m, Multiplicity.create(p.getMinOccurs(),max) );

    }

    public Multiplicity wildcard(XSWildcard wc) {

        return ONE;

    }

    public Multiplicity modelGroupDecl(XSModelGroupDecl decl) {

        return modelGroup(decl.getModelGroup());

    }

    public Multiplicity modelGroup(XSModelGroup group) {

        boolean isChoice = group.getCompositor() == XSModelGroup.CHOICE;

        Multiplicity r = ZERO;

        for( XSParticle p : group.getChildren()) {

            Multiplicity m = particle(p);

            if(r==null) {

                r=m;

                continue;

            }

            if(isChoice) {

                r = Multiplicity.choice(r,m);

            } else {

                r = Multiplicity.group(r,m);

            }

        }

        return r;

    }

    public Multiplicity elementDecl(XSElementDecl decl) {

        return ONE;

    }

}