| /* |
| * 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.sling.distribution.util.impl; |
| |
| import javax.annotation.Nonnull; |
| |
| import static java.lang.Math.min; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.ByteBuffer; |
| |
| final class ByteBufferBackedInputStream extends InputStream { |
| |
| private final ByteBuffer memory; |
| |
| private final FileInputStream fileInputStream; |
| |
| public ByteBufferBackedInputStream(ByteBuffer memory, File file) throws IOException { |
| this.memory = memory; |
| if (file != null) { |
| fileInputStream = new FileInputStream(file); |
| } else { |
| fileInputStream = null; |
| } |
| } |
| |
| public int read() throws IOException { |
| if (!memory.hasRemaining()) { |
| if (fileInputStream != null) { |
| return fileInputStream.read(); |
| } |
| |
| return -1; |
| } |
| return memory.get() & 0xFF; |
| } |
| |
| public int read(@Nonnull byte[] bytes, int off, int len) throws IOException { |
| if (!memory.hasRemaining()) { |
| if (fileInputStream != null) { |
| return fileInputStream.read(bytes, off, len); |
| } |
| |
| return -1; |
| } |
| |
| len = min(len, memory.remaining()); |
| memory.get(bytes, off, len); |
| return len; |
| } |
| |
| } |