| package org.apache.maven.shared.filtering; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| |
| /** |
| * A reader that imposes a limit to the number of bytes that can be read from |
| * an underlying reader, simulating eof when this limit is reached. |
| * This stream can typically be used to constrain a client with regard to a readAheadLimit |
| * of an underlying stream, to avoid overrunning this limit and hence |
| * lose the opportunity do to reset. |
| */ |
| public class BoundedReader |
| extends Reader |
| { |
| |
| private final Reader target; |
| |
| int pos = 0; |
| |
| int readAheadLimit; |
| |
| public BoundedReader( Reader target, int readAheadLimit ) |
| throws IOException |
| { |
| this.target = target; |
| target.mark( readAheadLimit ); |
| this.readAheadLimit = readAheadLimit; |
| } |
| |
| @Override |
| public void close() |
| throws IOException |
| { |
| target.close(); |
| } |
| |
| @Override |
| public void reset() |
| throws IOException |
| { |
| pos = 0; |
| target.reset(); |
| } |
| |
| @Override |
| public void mark( int theReadAheadLimit ) |
| throws IOException |
| { |
| this.readAheadLimit = theReadAheadLimit; |
| target.mark( theReadAheadLimit ); |
| } |
| |
| @Override |
| public int read() |
| throws IOException |
| { |
| if ( pos >= readAheadLimit ) |
| { |
| return -1; |
| } |
| pos++; |
| return target.read(); |
| } |
| |
| @Override |
| public int read( char[] cbuf, int off, int len ) |
| throws IOException |
| { |
| int c; |
| for ( int i = 0; i < len; i++ ) |
| { |
| c = read(); |
| if ( c == -1 ) |
| { |
| return i; |
| } |
| cbuf[off + i] = (char) c; |
| } |
| return len; |
| } |
| } |