| /* |
| * 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(); |
| } |
| } |
| } |