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}