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.commons.collections.primitives.adapters.io; 018 019import java.io.Reader; 020 021import org.apache.commons.collections.primitives.CharIterator; 022 023/** 024 * Adapts a {@link CharIterator} to the {@link Reader} interface. 025 * 026 * @version $Revision: 480462 $ $Date: 2006-11-29 03:15:00 -0500 (Wed, 29 Nov 2006) $ 027 * @author Rodney Waldhoff 028 */ 029public class CharIteratorReader extends Reader { 030 031 public CharIteratorReader(CharIterator in) { 032 this.iterator= in; 033 } 034 035 public int read(char[] buf, int off, int len) { 036 if(iterator.hasNext()) { 037 int count = 0; 038 while(iterator.hasNext() && count < len) { 039 buf[off + count] = iterator.next(); 040 count++; 041 } 042 return count; 043 } else { 044 return -1; 045 } 046 } 047 048 public void close() { 049 } 050 051 public static Reader adapt(CharIterator in) { 052 return null == in ? null : new CharIteratorReader(in); 053 } 054 055 private CharIterator iterator = null; 056 057}