001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel.util; 018 019/** 020 * A little helper class for converting a collection of values to a (usually comma separated) string. 021 * 022 * @version 023 */ 024public class CollectionStringBuffer { 025 private final StringBuilder buffer = new StringBuilder(); 026 private String separator; 027 private boolean first = true; 028 029 public CollectionStringBuffer() { 030 this(", "); 031 } 032 033 public CollectionStringBuffer(String separator) { 034 this.separator = separator; 035 } 036 037 @Override 038 public String toString() { 039 return buffer.toString(); 040 } 041 042 public void append(Object value) { 043 if (first) { 044 first = false; 045 } else { 046 buffer.append(separator); 047 } 048 buffer.append(value); 049 } 050 051 public String getSeparator() { 052 return separator; 053 } 054 055 public void setSeparator(String separator) { 056 this.separator = separator; 057 } 058 059 public boolean isEmpty() { 060 return first; 061 } 062}