org.canova.api.io.DataInputBuffer Maven / Gradle / Ivy
/*
*
* *
* * * Copyright 2015 Skymind,Inc.
* * *
* * * 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.
* *
*
*/
package org.canova.api.io;
import java.io.*;
/** A reusable {@link DataInput} implementation that reads from an in-memory
* buffer.
*
* This saves memory over creating a new DataInputStream and
* ByteArrayInputStream each time data is read.
*
*
Typical usage is something like the following:
*
* DataInputBuffer buffer = new DataInputBuffer();
* while (... loop condition ...) {
* byte[] data = ... get data ...;
* int dataLength = ... get data length ...;
* buffer.reset(data, dataLength);
* ... read buffer using DataInput methods ...
* }
*
*
*/
public class DataInputBuffer extends DataInputStream {
private static class Buffer extends ByteArrayInputStream {
public Buffer() {
super(new byte[] {});
}
public void reset(byte[] input, int start, int length) {
this.buf = input;
this.count = start+length;
this.mark = start;
this.pos = start;
}
public byte[] getData() { return buf; }
public int getPosition() { return pos; }
public int getLength() { return count; }
}
private Buffer buffer;
/** Constructs a new empty buffer. */
public DataInputBuffer() {
this(new Buffer());
}
private DataInputBuffer(Buffer buffer) {
super(buffer);
this.buffer = buffer;
}
/** Resets the data that the buffer reads. */
public void reset(byte[] input, int length) {
buffer.reset(input, 0, length);
}
/** Resets the data that the buffer reads. */
public void reset(byte[] input, int start, int length) {
buffer.reset(input, start, length);
}
public byte[] getData() {
return buffer.getData();
}
/** Returns the current position in the input. */
public int getPosition() { return buffer.getPosition(); }
/** Returns the length of the input. */
public int getLength() { return buffer.getLength(); }
}