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This module contains the Metro runtime code.
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/* 
 *  DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *  
 *  Copyright (c) 2002-2010 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 glassfish/bootstrap/legal/LICENSE.txt.
 *  
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 *  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:
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 *  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
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 */ 

package org.glassfish.gmbal.generic ;

import java.util.List ;
import java.util.ArrayList ;
import java.util.Formatter;

public class OperationTracer {
    private static boolean enabled = true ;

    public static void enable() {
        enabled = true ;
    }

    public static void disable() {
        enabled = false ;
    }

    private OperationTracer() {}

    private static ThreadLocal>> state = new ThreadLocal() {
        @Override
        public List> initialValue() {
            return new ArrayList>() ;
        }
    } ;


    private static String format( final Pair arg ) {
        String name = arg.first() ;
        Object[] args = arg.second() ;
        StringBuilder sb = new StringBuilder() ;
        if (name == null) {
            sb.append( "!NULL_NAME!" ) ;
        } else {
            sb.append( name ) ;
        }

        sb.append( '(' ) ;
        boolean first = true ;
        for (Object obj : args ) {
            if (first) {
                first = false ;
            } else {
                sb.append( ',' ) ;
            }

	    sb.append( Algorithms.convertToString(obj)) ;
        }
        sb.append( ')' ) ;
        return sb.toString() ;
    }

    /** Return the current contents of the OperationTracer state
     * for the current thread.
     */
    public static String getAsString() {
        final StringBuilder sb = new StringBuilder() ;
        final Formatter fmt = new Formatter( sb ) ;
        final List> elements = state.get() ;
        int ctr = 0 ;
        for (Pair elem : elements) {
            fmt.format( "\n\t(%3d): %s", ctr++, format( elem ) ) ;
        }

        return sb.toString() ;
    }

    public static void clear() {
        if (enabled) {
            state.get().clear() ;
        }
    }

    public static void enter( final String name, final Object... args ) {
        if (enabled) {
            state.get().add( new Pair( name, args ) ) ;
        }
    }

    public static void exit() {
        if (enabled) {
            final List> elements = state.get() ;
            int size = elements.size() ;
            if (size > 0) {
                elements.remove( size - 1 ) ;
            }
        }
    }
}