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30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
ExtendedReader.java | 59.1% | 54.2% | 45.5% | 54.3% |
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// Copyright 2004, 2005 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package org.apache.tapestry.util.text;
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import java.io.IOException;
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import java.io.Reader;
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/**
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* A Reader that provides some additional functionality, such as peek().
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*
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* @author mb
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* @since 4.0
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*/
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public class ExtendedReader extends Reader |
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{ |
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private Reader _reader;
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private boolean _hasBufferedChar = false; |
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private char _bufferedChar; |
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/**
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* Creates a new extended reader that reads from the provided object
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*
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* @param in the Reader to get data from
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*/
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public ExtendedReader(Reader in)
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{ |
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_reader = in; |
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} |
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/**
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* Returns the next character in the stream without actually comitting the read.
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* Multiple consequtive invocations of this method should return the same value.
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*
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* @return the next character waiting in the stream or -1 if the end of the stream is reached
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* @throws IOException if an error occurs
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*/
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public synchronized int peek() throws IOException |
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{ |
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if (!_hasBufferedChar) {
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int bufferedChar = read();
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53 | 57214 |
if (bufferedChar < 0)
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return bufferedChar;
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_bufferedChar = (char) bufferedChar;
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_hasBufferedChar = true;
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} |
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return _bufferedChar;
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} |
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/**
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* Determines whether the end of the stream is reached
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*
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* @return true if at the end of stream
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* @throws IOException if an error occurs
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*/
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public synchronized boolean isEndOfStream() throws IOException |
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{ |
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return peek() < 0;
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} |
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/**
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* Skips the next characters until a character that does not match the provided rule is reached.
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*
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* @param matcher the object determining whether a character should be skipped
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* @throws IOException if an error occurs
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*/
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public synchronized void skipCharacters(ICharacterMatcher matcher) throws IOException |
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{ |
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while (true) { |
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if (isEndOfStream())
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break;
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char ch = (char) peek(); |
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if (!matcher.matches(ch))
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break;
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read(); |
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} |
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} |
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/**
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* Reads the next characters until a character that does not match the provided rule is reached.
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*
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* @param matcher the object determining whether a character should be read
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* @return the string of characters read
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* @throws IOException if an error occurs
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*/
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public synchronized String readCharacters(ICharacterMatcher matcher) throws IOException |
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{ |
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StringBuffer buf = new StringBuffer();
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100 | 0 |
while (true) { |
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if (isEndOfStream())
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break;
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103 | 0 |
char ch = (char) peek(); |
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if (!matcher.matches(ch))
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break;
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buf.append(read()); |
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} |
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return buf.toString();
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} |
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/**
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* @see java.io.FilterReader#read(char[], int, int)
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*/
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public synchronized int read(char[] cbuf, int off, int len) throws IOException |
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{ |
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116 | 114259 |
if (len <= 0)
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return 0;
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boolean extraChar = _hasBufferedChar;
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120 | 114259 |
if (_hasBufferedChar) {
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121 | 57026 |
_hasBufferedChar = false;
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cbuf[off++] = _bufferedChar; |
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len--; |
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} |
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int read = _reader.read(cbuf, off, len);
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127 | 114259 |
if (extraChar)
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read++; |
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return read;
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} |
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/**
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* @see java.io.FilterReader#ready()
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*/
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135 | 0 |
public synchronized boolean ready() throws IOException |
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{ |
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137 | 0 |
if (_hasBufferedChar)
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return true; |
139 | 0 |
return _reader.ready();
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} |
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/**
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* @see java.io.FilterReader#markSupported()
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*/
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145 | 0 |
public synchronized boolean markSupported() |
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{ |
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147 | 0 |
return false; |
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} |
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/**
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* @see java.io.FilterReader#reset()
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*/
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153 | 0 |
public synchronized void reset() throws IOException |
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{ |
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_hasBufferedChar = false;
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_reader.reset(); |
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} |
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/**
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* @see java.io.FilterReader#skip(long)
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*/
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162 | 0 |
public synchronized long skip(long n) throws IOException |
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{ |
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164 | 0 |
if (_hasBufferedChar && n > 0) {
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165 | 0 |
_hasBufferedChar = false;
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166 | 0 |
n--; |
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} |
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168 | 0 |
return _reader.skip(n);
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} |
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/**
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* @see java.io.Reader#close()
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*/
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174 | 0 |
public synchronized void close() throws IOException |
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{ |
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176 | 0 |
_hasBufferedChar = false;
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177 | 0 |
_reader.close(); |
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} |
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} |
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