/*

 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.

 * 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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 * questions.

 */

package build.tools.jdwpgen;

import java.util.*;

class Context {

    static final int outer = 0;

    static final int readingReply = 1;

    static final int writingCommand = 2;

    final String whereJava;

    final String whereC;

    int state = outer;

    private boolean inEvent = false;

    Context() {

        whereJava = "";

        whereC = "";

    }

    private Context(String whereJava, String whereC) {

        this.whereJava = whereJava;

        this.whereC = whereC;

    }

    Context subcontext(String level) {

        Context ctx;

        if (whereC.length() == 0) {

            ctx = new Context(level, level);

        } else {

            ctx = new Context(whereJava + "." + level, whereC + "_" + level);

        }

        ctx.state = state;

        ctx.inEvent = inEvent;

        return ctx;

    }

    private Context cloneContext() {

        Context ctx = new Context(whereJava, whereC);

        ctx.state = state;

        ctx.inEvent = inEvent;

        return ctx;

    }

    Context replyReadingSubcontext() {

        Context ctx = cloneContext();

        ctx.state = readingReply;

        return ctx;

    }

    Context commandWritingSubcontext() {

        Context ctx = cloneContext();

        ctx.state = writingCommand;

        return ctx;

    }

    Context inEventSubcontext() {

        Context ctx = cloneContext();

        ctx.inEvent = true;

        return ctx;

    }

    boolean inEvent() {

        return inEvent;

    }

    boolean isWritingCommand() {

        return state == writingCommand;

    }

    boolean isReadingReply() {

        return state == readingReply;

    }

}