| /* |
| * 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.drill.exec.store; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.EOFException; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.fs.PositionedReadable; |
| import org.apache.hadoop.fs.Seekable; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; |
| |
| public class ResourceInputStream extends ByteArrayInputStream implements Seekable, PositionedReadable { |
| static final Logger logger = LoggerFactory.getLogger(ResourceInputStream.class); |
| |
| public ResourceInputStream(byte[] bytes) { |
| super(bytes); |
| } |
| |
| @Override |
| public void readFully(long position, byte[] buffer) throws IOException { |
| int l = read(position, buffer, 0, buffer.length); |
| if (l < buffer.length) { |
| throw new EOFException(); |
| } |
| } |
| |
| @Override |
| public int read(long position, byte b[], int off, int len) { |
| Preconditions.checkNotNull(b); |
| Preconditions.checkPositionIndexes(off, off + len, b.length); |
| |
| int start = (int) position; |
| |
| if (start >= count) { |
| return -1; |
| } |
| |
| int avail = count - start; |
| if (len > avail) { |
| len = avail; |
| } |
| if (len <= 0) { |
| return 0; |
| } |
| System.arraycopy(buf, start, b, off, len); |
| return len; |
| } |
| |
| @Override |
| public void readFully(long position, byte[] buffer, int offset, int length) throws IOException { |
| int l = read(position, buffer, offset, length); |
| if (l < length) { |
| throw new EOFException(); |
| } |
| } |
| |
| @Override |
| public long getPos() throws IOException { |
| return pos; |
| } |
| |
| @Override |
| public int read(byte[] b) throws IOException { |
| int l = read(pos, b, 0, b.length); |
| pos += l; |
| return l; |
| } |
| |
| @Override |
| public boolean seekToNewSource(long arg0) throws IOException { |
| seek(arg0); |
| return true; |
| } |
| |
| @Override |
| public void seek(long arg0) throws IOException { |
| if (buf.length > arg0) { |
| pos = (int) arg0; |
| } else { |
| throw new EOFException(); |
| } |
| } |
| } |