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/*
* Copyright 2013-2014 Richard M. Hightower
* Licensed 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.
*
* __________ _____ __ .__
* \______ \ ____ ____ ____ /\ / \ _____ | | _|__| ____ ____
* | | _// _ \ / _ \ / \ \/ / \ / \\__ \ | |/ / |/ \ / ___\
* | | ( <_> | <_> ) | \ /\ / Y \/ __ \| <| | | \/ /_/ >
* |______ /\____/ \____/|___| / \/ \____|__ (____ /__|_ \__|___| /\___ /
* \/ \/ \/ \/ \/ \//_____/
* ____. ___________ _____ ______________.___.
* | |____ ___ _______ \_ _____/ / _ \ / _____/\__ | |
* | \__ \\ \/ /\__ \ | __)_ / /_\ \ \_____ \ / | |
* /\__| |/ __ \\ / / __ \_ | \/ | \/ \ \____ |
* \________(____ /\_/ (____ / /_______ /\____|__ /_______ / / ______|
* \/ \/ \/ \/ \/ \/
*/
package org.boon.primitive;
import org.boon.Boon;
import java.io.IOException;
import java.io.Reader;
/**
* Created by Richard on 3/13/14.
*/
public class IOReader extends Reader{
private static int defaultBufferSize = 100_000;
private char buffer[];
private Reader reader;
private int length;
private int position;
public IOReader( int size) {
this.reader = reader;
buffer = new char[size];
}
public IOReader() {
this.reader = reader;
buffer = new char[defaultBufferSize];
}
public static IOReader reader(IOReader reader, int size) {
if (reader == null) {
return new IOReader(size);
} else {
return reader;
}
}
public IOReader reader(Reader in) {
try {
close();
} catch (IOException e) {
Boon.logger("IO").warn(e.getMessage(), e);
}
this.reader = in;
return this;
}
public int read() throws IOException {
if (position >= length) {
position = 0;
int countRead = reader.read(buffer);
length = countRead;
if (length == -1) {
return -1;
}
}
int value = buffer [position];
position++;
return value & 0xff;
}
@Override
public int read(char[] destination, int destinationOffset, int destinationLength) throws IOException {
if (reader == null) {
throw new IOException("Stream is closed");
}
final int available = length - position;
/*There is more in the buffer than they asked for so give them what we have an increment the position. */
if ( available >= destinationLength ) {
System.arraycopy(this.buffer, position, destination,
destinationOffset, destinationLength);
position += destinationLength;
return destinationLength;
/* There is something in the buffer. just not enough */
} else {
if (available>0) {
//puts (available, destinationLength, destinationOffset);
System.arraycopy(this.buffer, position, destination,
destinationOffset, available);
/* YOu read some so increment the destination. */
destinationLength -= available;
destinationOffset += available;
}
//puts (available, destinationLength, destinationOffset);
/* Read the buffer and server them the rest out of the buffer. */
//grow(destination);
position = 0;
int countRead = reader.read(buffer);
length = countRead;
if (length == -1) {
return available == 0 ? -1 : available;
}
//puts (available, destinationLength, destinationOffset);
/* We read a new buffer in but we need the lesser of the two. */
int amountToRead = destinationLength < length ? destinationLength : length;
System.arraycopy(this.buffer, position, destination,
destinationOffset, amountToRead);
position = amountToRead;
destinationLength -= amountToRead;
destinationOffset += amountToRead;
if (destinationLength==0) {
return amountToRead + available;
} else {
countRead = read(destination, destinationOffset, destinationLength);
if (countRead == -1) {
return amountToRead + available;
} else {
return amountToRead + available + countRead;
}
}
}
}
public long skip(long n) throws IOException {
throw new IOException("Skip not supported");
}
public void close() throws IOException {
if (reader!=null) {
reader.close();
}
reader = null;
this.position = 0;
this.length = 0;
}
}
