methodkey.java

用Java写的面相对象的数据库管理系统

// 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) 1997-2000 by SMB GmbH. All rights reserved.
//
// $Id: MethodKey.java,v 1.4 2000/10/28 16:55:16 daniela Exp $

package org.ozoneDB.core;

import java.io.*;
import java.util.*;
import java.lang.reflect.*;
import org.ozoneDB.*;
import org.ozoneDB.tools.OPP.*;
import org.ozoneDB.DxLib.*;
import org.ozoneDB.core.*;
import org.ozoneDB.util.*;


/**
 * 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: 1.4 $Date: 2000/10/28 16:55:16 $
 */
public final class MethodKey extends DxObject {
    
    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 boolean isLess( DxCompatible obj ) {
        MethodKey rhs = (MethodKey)obj;
        
        // 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() ) < 0;
    } 
    
    
    public String toString() {
        return className + "." + methodName + "(" + sig + ")";
    } 
    
}