methodkey.java

Java的面向对象数据库系统的源代码

// You can redistribute this software and/or modify it under the terms of

// the Ozone Core License version 1 published by ozone-db.org.

//

// The original code and portions created by SMB are

// Copyright (C) 1997-@year@ by SMB GmbH. All rights reserved.

//

// $Id: MethodKey.java,v 1.5 2003/11/01 18:34:36 ohlrogge Exp $



package org.ozoneDB.core;



import org.ozoneDB.DxLib.DxCompatible;

import org.ozoneDB.DxLib.DxObject;



import java.lang.reflect.Method;





/**

 * Objects of this class are the keys in the method cache table of the

 * {@link AbstractObjectContainer}. This class implements the way we map from

 * class+methodName+sig to the actual method. This is very important for the

 * overall peformance of ozone. Besides this class is used to sort method

 * arrays.

 *

 *

 * @author <a href="http://www.softwarebuero.de/">SMB</a>

 * @version $Revision: 1.5 $Date: 2003/11/01 18:34:36 $

 */

public final class MethodKey implements Comparable

{

    protected String methodName;



    protected String sig;



    protected String className;



    protected Method method;





    public MethodKey( String _className, String _methodName, String _sig ) {

        this( _className, _methodName, _sig, null );

    }





    public MethodKey( String _className, String _methodName, String _sig, Method _method ) {

        className = _className;

        methodName = _methodName;

        sig = _sig;

        method = _method;

    }





    public Method method() {

        return method;

    }





    public int hashCode() {

        return methodName.hashCode() ^ sig.hashCode();

    }





    public boolean equals( Object obj ) {

        MethodKey rhs = (MethodKey)obj;

        return className.equals( rhs.className ) && sig.equals( rhs.sig ) && methodName.equals( rhs.methodName );

    }

  public String toString() {


    return className + "." + methodName + "(" + sig + ")";

  }

  public int compareTo(Object o) {
    MethodKey rhs = (MethodKey) o;



        // this method is just used to sort a method array, so it doesn't

        // need to be that fast...

        StringBuffer buf = new StringBuffer( className );

        buf.append( methodName );

        buf.append( sig );



        StringBuffer rhsBuf = new StringBuffer( rhs.className );

        rhsBuf.append( rhs.methodName );

        rhsBuf.append( rhs.sig );



    return buf.toString().compareTo(rhsBuf.toString());

    }
}