| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.jackrabbit.oak.spi.blob; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.apache.jackrabbit.oak.commons.IOUtils; |
| |
| /** |
| * An input stream to simplify reading from a store. |
| * See also MicroKernelInputStream. |
| */ |
| public class BlobStoreInputStream extends InputStream { |
| |
| private final BlobStore store; |
| private final String id; |
| private long pos; |
| private byte[] oneByteBuff; |
| |
| public BlobStoreInputStream(BlobStore store, String id, long pos) { |
| this.store = store; |
| this.id = id; |
| this.pos = pos; |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) throws IOException { |
| int l; |
| try { |
| l = store.readBlob(id, pos, b, off, len); |
| } catch (Exception e) { |
| throw new IOException(e); |
| } |
| if (l < 0) { |
| return l; |
| } |
| pos += l; |
| return l; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| if (oneByteBuff == null) { |
| oneByteBuff = new byte[1]; |
| } |
| int len = read(oneByteBuff, 0, 1); |
| if (len < 0) { |
| return len; |
| } |
| return oneByteBuff[0] & 0xff; |
| } |
| |
| public static byte[] readFully(BlobStore store, String id) throws IOException { |
| int len = (int) store.getBlobLength(id); |
| byte[] buff = new byte[len]; |
| BlobStoreInputStream in = new BlobStoreInputStream(store, id, 0); |
| IOUtils.readFully(in, buff, 0, len); |
| return buff; |
| } |
| |
| } |