dxstring.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 Library 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: DxString.java,v 1.6 2000/10/28 16:55:14 daniela Exp $

package org.ozoneDB.DxLib;

import java.io.*;


public class DxString extends DxObject implements Externalizable {
    
    final static long serialVersionUID = 1L;
    
    String value = new String();
    
    
    public DxString() {
        super();
    }
    
    
    public DxString( DxString s ) {
        super();
        value = new String( s.value );
    }
    
    
    public DxString( String v ) {
        super();
        value = new String( v );
    }
    
    
    public Object clone() {
        return new DxString( value );
    } 
    
    
    public boolean equals( String obj ) {
        return value.equals( obj );
    } 
    
    
    public boolean equals( Object obj ) {
        if (this == obj) {
            return true;
        } 
        if (obj instanceof DxString && obj != null) {
            return value.equals( ((DxString)obj).value );
        } else {
            return false;
        } 
    } 
    
    
    public boolean isLess( DxCompatible obj ) {
        if (this == obj) {
            return false;
        } 
        return value.compareTo( ((DxString)obj).value ) < 0;
    } 
    
    
    public String toString() {
        return value;
    } 
    
    
    public int hashCode() {
        //die fehlenden bits dann mit equals()
        return value.hashCode();
    } 
    
    
    public DxString append( DxString s ) {
        value += s;
        return this;
    } 
    
    
    public DxString append( String s ) {
        return append( new DxString( s ) );
    } 
    
    
    public DxString prepend( DxString s ) {
        value = s + value;
        return this;
    } 
    
    
    public DxString prepend( String s ) {
        return prepend( new DxString( s ) );
    } 
    
    
    public void insertAt( DxString s, int a ) {
        insertAt( s, a, s.length() );
    } 
    
    
    public void insertAt( String s, int a ) {
        insertAt( new DxString( s ), a, s.length() );
    } 
    
    
    public void insertAt( DxString s, int a, int len ) {
        String pre = value.substring( 0, a );
        String app = value.substring( a, value.length() );
        value = pre + s.value.substring( 0, len ) + app;
    } 
    
    
    public void insertAt( String s, int a, int len ) {
        insertAt( new DxString( s ), a, len );
    } 
    
    
    public void deleteAt( int a ) {
        deleteAt( a, value.length() - a );
    } 
    
    
    public void deleteAt( int a, int len ) {
        String pre = value.substring( 0, a );
        String app = value.substring( a + len, value.length() );
        value = pre + app;
    } 
    
    
    public DxString at( int a, int len ) {
        return new DxString( value.substring( a, a + len ) );
    } 
    
    
    public int length() {
        return value.length();
    } 
    
    
    public void writeExternal( ObjectOutput out ) throws IOException {
        out.writeUTF( value );
    } 
    
    
    public void readExternal( ObjectInput in ) throws IOException, ClassNotFoundException {
        value = in.readUTF();
    } 
    
}