xyz.cofe.text.LineReaderIterator Maven / Gradle / Ivy
/*
* The MIT License
*
* Copyright 2016 [email protected].
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package xyz.cofe.text;
import java.io.Closeable;
import java.io.IOException;
import java.io.Reader;
import java.util.Arrays;
import java.util.Iterator;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.logging.Level;
import java.util.logging.Logger;
import xyz.cofe.collection.Func1;
/**
*
* @author [email protected]
*/
public class LineReaderIterator
implements Iterator, Closeable
{
//
private static final Logger logger = Logger.getLogger(LineReaderIterator.class.getName());
private static final Level logLevel = logger.getLevel();
private static final boolean isLogSevere =
logLevel==null
? true
: logLevel.intValue() <= Level.SEVERE.intValue();
private static final boolean isLogWarning =
logLevel==null
? true
: logLevel.intValue() <= Level.WARNING.intValue();
private static final boolean isLogInfo =
logLevel==null
? true
: logLevel.intValue() <= Level.INFO.intValue();
private static final boolean isLogFine =
logLevel==null
? true
: logLevel.intValue() <= Level.FINE.intValue();
private static final boolean isLogFiner =
logLevel==null
? true
: logLevel.intValue() <= Level.FINER.intValue();
private static final boolean isLogFinest =
logLevel==null
? true
: logLevel.intValue() <= Level.FINEST.intValue();
private static void logFine(String message,Object ... args){
logger.log(Level.FINE, message, args);
}
private static void logFiner(String message,Object ... args){
logger.log(Level.FINER, message, args);
}
private static void logFinest(String message,Object ... args){
logger.log(Level.FINEST, message, args);
}
private static void logInfo(String message,Object ... args){
logger.log(Level.INFO, message, args);
}
private static void logWarning(String message,Object ... args){
logger.log(Level.WARNING, message, args);
}
private static void logSevere(String message,Object ... args){
logger.log(Level.SEVERE, message, args);
}
private static void logException(Throwable ex){
logger.log(Level.SEVERE, null, ex);
}
//
protected Reader reader = null;
protected char[] buff = new char[1024*4];
protected String[] lines = null;
protected final Lock lock;
protected Func1 closeReader = null;
public LineReaderIterator(Reader reader){
if( reader==null ) throw new IllegalArgumentException( "reader==null" );
this.reader = reader;
this.lock = new ReentrantLock();
lines = readLines();
}
public LineReaderIterator(Reader reader,int bufferSize,Func1 closeReader, Lock lock){
if( reader==null ) throw new IllegalArgumentException( "reader==null" );
if( bufferSize<1 )throw new IllegalArgumentException("bufferSize<1");
this.buff = new char[bufferSize];
this.lock = lock==null ? new ReentrantLock() : lock;
this.closeReader = closeReader;
this.reader = reader;
lines = readLines();
}
protected String[] readLines(){
try{
lock.lock();
StringBuilder sb = new StringBuilder();
while( true ){
if( reader==null )break;
try {
int readed = reader.read(buff);
if( readed>0 ){
String l = new String(buff,0,readed);
if( l.contains("\n") || l.contains("\r") ){
sb.append(l);
return Text.splitNewLines(sb.toString());
}else{
sb.append(l);
continue;
}
}else if( readed==0 ){
continue;
}else{
if( closeReader!=null ){
closeReader.apply(reader);
}
reader = null;
}
} catch (IOException ex) {
Logger.getLogger(LineReaderIterator.class.getName()).log(Level.SEVERE, null, ex);
}
}
return Text.splitNewLines(sb.toString());
}finally{
lock.unlock();
}
}
@Override
public boolean hasNext() {
try{
lock.lock();
return lines!=null && lines.length>0;
}finally{
lock.unlock();
}
}
@Override
public String next() {
try{
lock.lock();
if( lines==null ){
try {
close();
} catch (IOException ex) {
Logger.getLogger(LineReaderIterator.class.getName()).log(Level.SEVERE, null, ex);
}
return null;
}
if( lines.length>1 ){
String l = lines[0];
lines = Arrays.copyOfRange(lines, 1, lines.length);
return l;
}else if( lines.length==1 ){
String[] lines2 = readLines();
if( lines2==null ){
String r = lines[0];
lines = null;
return r;
}else if( lines2.length==0 ){
String r = lines[0];
lines = null;
return r;
}else if( lines2.length==1 ){
String l0 = lines[0];
String l1 = lines2[0];
String r = l0 + l1;
lines = null;
return r;
}else{
String l0 = lines[0];
String l1 = lines2[0];
String r = l0 + l1;
lines = lines2;
lines = Arrays.copyOfRange(lines, 1, lines.length);
return r;
}
}else{
try {
close();
} catch (IOException ex) {
Logger.getLogger(LineReaderIterator.class.getName()).log(Level.SEVERE, null, ex);
}
return null;
}
}finally{
lock.unlock();
}
}
@Override
public void remove() {
// throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public void close() throws IOException {
try{
lock.lock();
if( lines!=null ){
lines = null;
}
if( reader!=null ){
if( closeReader!=null ){
closeReader.apply(reader);
}
reader = null;
}
}finally{
lock.unlock();
}
}
@Override
@SuppressWarnings( "FinalizeDeclaration" )
protected void finalize() throws Throwable {
try{
close();
}catch( Throwable er ){
logException(er);
}
super.finalize();
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy