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

import java.util.Collections;

import static com.sun.tools.internal.xjc.reader.xmlschema.ct.ComplexTypeBindingMode.NORMAL;

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

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

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

/**

 * Binds a complex type whose immediate child is a choice

 * model group to a choice content interface.

 *

 * @author Kohsuke Kawaguchi

 */

final class ChoiceContentComplexTypeBuilder extends CTBuilder {

    public boolean isApplicable(XSComplexType ct) {

        if( !bgmBuilder.getGlobalBinding().isChoiceContentPropertyEnabled() )

            return false;

        if( ct.getBaseType()!=schemas.getAnyType() )

            // My reading of the spec is that if a complex type is

            // derived from another complex type by extension,

            // its top level model group is always a sequence

            // that combines the base type content model and

            // the extension defined in the new complex type.

            return false;

        XSParticle p = ct.getContentType().asParticle();

        if(p==null)

            return false;

        XSModelGroup mg = getTopLevelModelGroup(p);

        if( mg.getCompositor()!=XSModelGroup.CHOICE )

            return false;

        if( p.isRepeated() )

            return false;

        return true;

    }

    private XSModelGroup getTopLevelModelGroup(XSParticle p) {

        XSModelGroup mg = p.getTerm().asModelGroup();

        if( p.getTerm().isModelGroupDecl() )

            mg = p.getTerm().asModelGroupDecl().getModelGroup();

        return mg;

    }

    public void build(XSComplexType ct) {

        XSParticle p = ct.getContentType().asParticle();

        builder.recordBindingMode(ct,NORMAL);

        bgmBuilder.getParticleBinder().build(p,Collections.singleton(p));

        green.attContainer(ct);

    }

}