/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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

import java.util.ArrayList;

import java.util.List;

import com.sun.xml.internal.dtdparser.DTDEventListener;

/**

 * @author Kohsuke Kawaguchi

 */

final class ModelGroup extends Term {

    enum Kind {

        CHOICE, SEQUENCE

    }

    Kind kind;

    private final List<Term> terms = new ArrayList<Term>();

    void normalize(List<Block> r, boolean optional) {

        switch(kind) {

        case SEQUENCE:

            for( Term t : terms )

                t.normalize(r,optional);

            return;

        case CHOICE:

            Block b = new Block(isOptional()||optional,isRepeated());

            addAllElements(b);

            r.add(b);

            return;

        }

    }

    void addAllElements(Block b) {

        for( Term t : terms )

            t.addAllElements(b);

    }

    boolean isOptional() {

        switch(kind) {

        case SEQUENCE:

            for( Term t : terms )

                if(!t.isOptional())

                    return false;

            return true;

        case CHOICE:

            for( Term t : terms )

                if(t.isOptional())

                    return true;

            return false;

        default:

            throw new IllegalArgumentException();

        }

    }

    boolean isRepeated() {

        switch(kind) {

        case SEQUENCE:

            return true;

        case CHOICE:

            for( Term t : terms )

                if(t.isRepeated())

                    return true;

            return false;

        default:

            throw new IllegalArgumentException();

        }

    }

    void setKind(short connectorType) {

        Kind k;

        switch(connectorType) {

        case DTDEventListener.SEQUENCE:

            k = Kind.SEQUENCE;

            break;

        case DTDEventListener.CHOICE:

            k = Kind.CHOICE;

            break;

        default:

            throw new IllegalArgumentException();

        }

        assert kind==null || k==kind;

        kind = k;

    }

    void addTerm(Term t) {

        if (t instanceof ModelGroup) {

            ModelGroup mg = (ModelGroup) t;

            if(mg.kind==this.kind) {

                terms.addAll(mg.terms);

                return;

            }

        }

        terms.add(t);

    }

    Term wrapUp() {

        switch(terms.size()) {

        case 0:

            return EMPTY;

        case 1:

            assert kind==null;

            return terms.get(0);

        default:

            assert kind!=null;

            return this;

        }

    }

}