001// *************************************************************************************************************************** 002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * 003// * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * 004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * 005// * with the License. You may obtain a copy of the License at * 006// * * 007// * http://www.apache.org/licenses/LICENSE-2.0 * 008// * * 009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an * 010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * 011// * specific language governing permissions and limitations under the License. * 012// *************************************************************************************************************************** 013package org.apache.juneau.parser; 014 015import java.io.*; 016 017/** 018 * Input stream meant to be used as input for stream-based parsers. 019 * 020 * <p> 021 * Keeps track of current byte position. 022 * 023 * <p> 024 * <b>Warning:</b> Not thread safe. 025 */ 026public class ParserInputStream extends InputStream implements Positionable { 027 028 private final InputStream is; 029 int pos = 0; 030 031 /** 032 * Constructor. 033 * 034 * @param pipe The parser input. 035 * @throws Exception 036 */ 037 protected ParserInputStream(ParserPipe pipe) throws Exception { 038 this.is = pipe.getInputStream(); 039 pipe.setPositionable(this); 040 } 041 042 @Override /* InputStream */ 043 public int read() throws IOException { 044 int i = is.read(); 045 if (i > 0) 046 pos++; 047 return i; 048 } 049 050 @Override /* Positionable */ 051 public Position getPosition() { 052 return new Position(pos); 053 } 054}