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     */
017    package 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     */
024    public 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    }