/* Copyright (c) 2001-2014, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb.lib;
import java.io.
IOException;
import java.io.
InputStream;
import java.nio.charset.
Charset;
/**
* A converter for InputStream to return String objects using the given
* charset for conversion. The readLine() method returns the next string
* excluding carriage-return and line-feed characters. No other character is
* excluded. A carriage-return followed by a line-feed is treated as a single
* end-of-line marker. Otherwise, each carriage-return or line-feed is treated
* as an end-of_line marker.
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.0.1
* @since 2.0.1
*/
public class
LineReader {
boolean
finished = false;
boolean
wasCR = false;
boolean
wasEOL = false;
HsqlByteArrayOutputStream baOS = new
HsqlByteArrayOutputStream(1024);
//
final
InputStream stream;
final
Charset charset;
final
String charsetName;
public
LineReader(
InputStream stream,
String charsetName) {
this.
stream =
stream;
this.
charsetName =
charsetName;
this.
charset =
Charset.
forName(
charsetName);
}
public
String readLine() throws
IOException {
if (
finished) {
return null;
}
while (true) {
int
c =
stream.
read();
if (
c == -1) {
finished = true;
if (
baOS.
size() == 0) {
return null;
}
break;
}
switch (
c) {
case '\r' : {
wasCR = true;
break;
}
case '\n' : {
if (
wasCR) {
wasCR = false;
continue;
} else {
break;
}
}
default : {
baOS.
write(
c);
wasCR = false;
continue;
}
}
break;
}
// can use charset with JDK 1.6
String string = new
String(
baOS.
getBuffer(), 0,
baOS.
size(),
charsetName);
baOS.
reset();
return
string;
}
public void
close() throws
IOException {
stream.
close();
}
}