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/*
* Copyright (C) 2010, Google Inc. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.lib;
import java.io.IOException;
import java.io.InputStream;
/**
* Stream of data coming from an object loaded by {@link org.eclipse.jgit.lib.ObjectLoader}.
*/
public abstract class ObjectStream extends InputStream {
/**
* Get Git object type, see {@link Constants}.
*
* @return Git object type, see {@link Constants}.
*/
public abstract int getType();
/**
* Get total size of object in bytes
*
* @return total size of object in bytes
*/
public abstract long getSize();
/**
* Simple stream around the cached byte array created by a loader.
* <p>
* ObjectLoader implementations can use this stream type when the object's
* content is small enough to be accessed as a single byte array, but the
* application has still requested it in stream format.
*/
public static class SmallStream extends ObjectStream {
private final int type;
private final byte[] data;
private int ptr;
private int mark;
/**
* Create the stream from an existing loader's cached bytes.
*
* @param loader
* the loader.
*/
public SmallStream(ObjectLoader loader) {
this(loader.getType(), loader.getCachedBytes());
}
/**
* Create the stream from an existing byte array and type.
*
*@param type
* the type constant for the object.
*@param data
* the fully inflated content of the object.
*/
public SmallStream(int type, byte[] data) {
this.type = type;
this.data = data;
}
@Override
public int getType() {
return type;
}
@Override
public long getSize() {
return data.length;
}
@Override
public int available() {
return data.length - ptr;
}
@Override
public long skip(long n) {
int s = (int) Math.min(available(), Math.max(0, n));
ptr += s;
return s;
}
@Override
public int read() {
if (ptr == data.length)
return -1;
return data[ptr++] & 0xff;
}
@Override
public int read(byte[] b, int off, int len) {
if (ptr == data.length)
return -1;
int n = Math.min(available(), len);
System.arraycopy(data, ptr, b, off, n);
ptr += n;
return n;
}
@Override
public boolean markSupported() {
return true;
}
@Override
public void mark(int readlimit) {
mark = ptr;
}
@Override
public void reset() {
ptr = mark;
}
}
/**
* Simple filter stream around another stream.
* <p>
* ObjectLoader implementations can use this stream type when the object's
* content is available from a standard InputStream.
*/
public static class Filter extends ObjectStream {
private final int type;
private final long size;
private final InputStream in;
/**
* Create a filter stream for an object.
*
* @param type
* the type of the object.
* @param size
* total size of the object, in bytes.
* @param in
* stream the object's raw data is available from. This
* stream should be buffered with some reasonable amount of
* buffering.
*/
public Filter(int type, long size, InputStream in) {
this.type = type;
this.size = size;
this.in = in;
}
@Override
public int getType() {
return type;
}
@Override
public long getSize() {
return size;
}
@Override
public int available() throws IOException {
return in.available();
}
@Override
public long skip(long n) throws IOException {
return in.skip(n);
}
@Override
public int read() throws IOException {
return in.read();
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
return in.read(b, off, len);
}
@Override
public boolean markSupported() {
return in.markSupported();
}
@Override
public void mark(int readlimit) {
in.mark(readlimit);
}
@Override
public void reset() throws IOException {
in.reset();
}
@Override
public void close() throws IOException {
in.close();
}
}
}
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