| /* |
| * 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.nifi.util; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.Properties; |
| import org.apache.commons.compress.archivers.tar.TarArchiveEntry; |
| import org.apache.commons.compress.archivers.tar.TarArchiveInputStream; |
| |
| public class FlowFileUnpackagerV1 implements FlowFileUnpackager { |
| |
| private int flowFilesRead = 0; |
| |
| @Override |
| public Map<String, String> unpackageFlowFile(final InputStream in, final OutputStream out) throws IOException { |
| flowFilesRead++; |
| final TarArchiveInputStream tarIn = new TarArchiveInputStream(in); |
| final TarArchiveEntry attribEntry = tarIn.getNextTarEntry(); |
| if (attribEntry == null) { |
| return null; |
| } |
| |
| final Map<String, String> attributes; |
| if (attribEntry.getName().equals(FlowFilePackagerV1.FILENAME_ATTRIBUTES)) { |
| attributes = getAttributes(tarIn); |
| } else { |
| throw new IOException("Expected two tar entries: " |
| + FlowFilePackagerV1.FILENAME_CONTENT + " and " |
| + FlowFilePackagerV1.FILENAME_ATTRIBUTES); |
| } |
| |
| final TarArchiveEntry contentEntry = tarIn.getNextTarEntry(); |
| |
| if (contentEntry != null && contentEntry.getName().equals(FlowFilePackagerV1.FILENAME_CONTENT)) { |
| final byte[] buffer = new byte[512 << 10];//512KB |
| int bytesRead = 0; |
| while ((bytesRead = tarIn.read(buffer)) != -1) { //still more data to read |
| if (bytesRead > 0) { |
| out.write(buffer, 0, bytesRead); |
| } |
| } |
| out.flush(); |
| } else { |
| throw new IOException("Expected two tar entries: " |
| + FlowFilePackagerV1.FILENAME_CONTENT + " and " |
| + FlowFilePackagerV1.FILENAME_ATTRIBUTES); |
| } |
| |
| return attributes; |
| } |
| |
| protected Map<String, String> getAttributes(final TarArchiveInputStream stream) throws IOException { |
| |
| final Properties props = new Properties(); |
| props.loadFromXML(new NonCloseableInputStream(stream)); |
| |
| final Map<String, String> result = new HashMap<>(); |
| for (final Entry<Object, Object> entry : props.entrySet()) { |
| final Object keyObject = entry.getKey(); |
| final Object valueObject = entry.getValue(); |
| if (!(keyObject instanceof String)) { |
| throw new IOException("Flow file attributes object contains key of type " |
| + keyObject.getClass().getCanonicalName() |
| + " but expected java.lang.String"); |
| } else if (!(keyObject instanceof String)) { |
| throw new IOException("Flow file attributes object contains value of type " |
| + keyObject.getClass().getCanonicalName() |
| + " but expected java.lang.String"); |
| } |
| |
| final String key = (String) keyObject; |
| final String value = (String) valueObject; |
| result.put(key, value); |
| } |
| |
| return result; |
| } |
| |
| @Override |
| public boolean hasMoreData() throws IOException { |
| return flowFilesRead == 0; |
| } |
| |
| public static final class NonCloseableInputStream extends InputStream { |
| |
| final InputStream stream; |
| |
| public NonCloseableInputStream(final InputStream stream) { |
| this.stream = stream; |
| } |
| |
| @Override |
| public void close() { |
| } |
| |
| @Override |
| public int read() throws IOException { |
| return stream.read(); |
| } |
| |
| @Override |
| public int available() throws IOException { |
| return stream.available(); |
| } |
| |
| @Override |
| public synchronized void mark(int readlimit) { |
| stream.mark(readlimit); |
| } |
| |
| @Override |
| public synchronized void reset() throws IOException { |
| stream.reset(); |
| } |
| |
| @Override |
| public boolean markSupported() { |
| return stream.markSupported(); |
| } |
| |
| @Override |
| public long skip(long n) throws IOException { |
| return stream.skip(n); |
| } |
| |
| @Override |
| public int read(byte b[], int off, int len) throws IOException { |
| return stream.read(b, off, len); |
| } |
| |
| @Override |
| public int read(byte b[]) throws IOException { |
| return stream.read(b); |
| } |
| } |
| } |