/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2011 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

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

import java.math.BigInteger;
import com.sun.tools.xjc.model.Multiplicity;
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;

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