Context.java

/*
 * @(#)Context.java	1.11 06/10/25
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program 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. 
 * 
 * This program 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 at /legal/license.txt). 
 * 
 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions. 
 */

package com.sun.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;
    }
}