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 */
022public class CollectionStringBuffer {
023    private final StringBuilder buffer = new StringBuilder();
024    private String separator;
025    private boolean first = true;
026
027    public CollectionStringBuffer() {
028        this(", ");
029    }
030
031    public CollectionStringBuffer(String separator) {
032        this.separator = separator;
033    }
034
035    @Override
036    public String toString() {
037        return buffer.toString();
038    }
039
040    public void append(Object value) {
041        if (first) {
042            first = false;
043        } else {
044            buffer.append(separator);
045        }
046        buffer.append(value);
047    }
048
049    public String getSeparator() {
050        return separator;
051    }
052
053    public void setSeparator(String separator) {
054        this.separator = separator;
055    }
056
057    public boolean isEmpty() {
058        return first;
059    }
060}