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- /*
- * Copyright (C) 2010, Google Inc.
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * 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 Eclipse Foundation, Inc. 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 THE COPYRIGHT OWNER 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.eclipse.jgit.lib;
-
- import java.io.IOException;
- import java.io.InputStream;
-
- /** Stream of data coming from an object loaded by {@link ObjectLoader}. */
- public abstract class ObjectStream extends InputStream {
- /** @return Git object type, see {@link Constants}. */
- public abstract int getType();
-
- /** @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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