Custom Logging using Apex

CustomLog.cls

public without sharing class CustomLog {

    private static StringBuffer buffer;
    
    static {
        buffer = new StringBuffer();
    }
    
    public static void append(String value) {
        buffer.append(value + '\n');
    }

    public static String toStr() {
        return buffer.toStr();
    }

    public static void attach(Id recordId) {

        ContentVersion contentVersion = new ContentVersion(
            versionData = Blob.valueOf(buffer.toStr()),
        title = 'Custom Log',
        pathOnClient =  '/Custom-Log-' + DateTime.now().getTime() + '.txt',
            FirstPublishLocationId = recordId);

        insert contentVersion; 
    }

    public static void attachToCurrentUser() {
        attach(UserInfo.getUserId());
    }
}

StringBuffer.cls

/* ============================================================
 * This code is part of the "apex-lang" open source project avaiable at:
 * 
 *      http://code.google.com/p/apex-lang/
 *
 * This code is licensed under the Apache License, Version 2.0.  You may obtain a 
 * copy of the License at:
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * ============================================================
 */
global class StringBuffer {

    private String theString;
    
    global StringBuffer(){
        this('');
    }
    
    global StringBuffer(String str){
        theString = str;
    }

    global StringBuffer(Decimal d){
        theString = '' + d;
    }
    
    global StringBuffer(Double d){
        theString = '' + d;
    }
    
    global StringBuffer(Long l){
        theString = '' + l;
    }
    
    global StringBuffer(Integer i){
        theString = '' + i;
    }
    
    global StringBuffer(Blob b){
        theString = '' + b;
    }
    
    global StringBuffer(Boolean b){
        theString = '' + b;
    }
    
    global StringBuffer(Date d){
        theString = '' + d;
    }
    
    global StringBuffer(Datetime d){
        theString = '' + d;
    }
    
    global StringBuffer(ID id){
        theString = '' + id;
    }
    
    global StringBuffer(Time t){
        theString = '' + t;
    }

    global StringBuffer append(String str){
        theString += str; return this;    
    }

    global StringBuffer append(Decimal d){
        theString += d;    return this;
    }
    
    global StringBuffer append(Double d){
        theString += d;    return this;
    }
    
    global StringBuffer append(Long l){
        theString += l;    return this;
    }
    
    global StringBuffer append(Integer i){
        theString += i;    return this;
    }
    
    global StringBuffer append(Blob b){
        theString += b;    return this;
    }
    
    global StringBuffer append(Boolean b){
        theString += b;    return this;
    }
    
    global StringBuffer append(Date d){
        theString += d;    return this;
    }
    
    global StringBuffer append(Datetime d){
        theString += d;    return this;
    }
    
    global StringBuffer append(ID id){
        theString += id; return this;
    }
    
    global StringBuffer append(Time t){
        theString += t;    return this;
    }

    global String toStr(){
        return theString;
    }
}