| /* |
| * 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.camel.dataformat.tarfile; |
| |
| import java.io.BufferedInputStream; |
| import java.io.ByteArrayInputStream; |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Iterator; |
| |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Message; |
| import org.apache.camel.RuntimeCamelException; |
| import org.apache.camel.support.DefaultMessage; |
| import org.apache.camel.util.IOHelper; |
| import org.apache.commons.compress.archivers.ArchiveException; |
| import org.apache.commons.compress.archivers.ArchiveInputStream; |
| import org.apache.commons.compress.archivers.ArchiveStreamFactory; |
| import org.apache.commons.compress.archivers.tar.TarArchiveEntry; |
| import org.apache.commons.compress.archivers.tar.TarArchiveInputStream; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * The Iterator which can go through the TarArchiveInputStream according to TarArchiveEntry |
| * Based on ZipIterator from camel-zipfile component |
| */ |
| public class TarIterator implements Iterator<Message>, Closeable { |
| |
| /** |
| * Header where this {@link TarIterator} will insert the current entry's file name. |
| */ |
| public static final String TARFILE_ENTRY_NAME_HEADER = "CamelTarFileEntryName"; |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger(TarIterator.class); |
| |
| private final Exchange exchange; |
| private volatile TarArchiveInputStream tarInputStream; |
| private volatile Message parent; |
| private boolean allowEmptyDirectory; |
| |
| public TarIterator(Exchange exchange, InputStream inputStream) { |
| this.exchange = exchange; |
| this.allowEmptyDirectory = false; |
| if (inputStream instanceof TarArchiveInputStream) { |
| tarInputStream = (TarArchiveInputStream) inputStream; |
| } else { |
| try { |
| ArchiveInputStream input = new ArchiveStreamFactory().createArchiveInputStream(ArchiveStreamFactory.TAR, new BufferedInputStream(inputStream)); |
| tarInputStream = (TarArchiveInputStream) input; |
| } catch (ArchiveException e) { |
| throw new RuntimeException(e.getMessage(), e); |
| } |
| } |
| parent = null; |
| } |
| |
| @Override |
| public boolean hasNext() { |
| try { |
| if (tarInputStream == null) { |
| return false; |
| } |
| boolean availableDataInCurrentEntry = tarInputStream.available() > 0; |
| if (!availableDataInCurrentEntry) { |
| // advance to the next entry. |
| parent = getNextElement(); |
| if (parent == null) { |
| tarInputStream.close(); |
| availableDataInCurrentEntry = false; |
| } else { |
| availableDataInCurrentEntry = true; |
| } |
| } |
| return availableDataInCurrentEntry; |
| } catch (IOException exception) { |
| throw new RuntimeCamelException(exception); |
| } |
| } |
| |
| @Override |
| public Message next() { |
| if (parent == null) { |
| parent = getNextElement(); |
| } |
| Message answer = parent; |
| parent = null; |
| checkNullAnswer(answer); |
| |
| return answer; |
| } |
| |
| private Message getNextElement() { |
| if (tarInputStream == null) { |
| return null; |
| } |
| |
| try { |
| TarArchiveEntry current = getNextEntry(); |
| |
| if (current != null) { |
| LOGGER.debug("Reading tarEntry {}", current.getName()); |
| Message answer = new DefaultMessage(exchange.getContext()); |
| answer.getHeaders().putAll(exchange.getIn().getHeaders()); |
| answer.setHeader(TARFILE_ENTRY_NAME_HEADER, current.getName()); |
| answer.setHeader(Exchange.FILE_NAME, current.getName()); |
| if (current.getSize() > 0) { |
| answer.setBody(new TarElementInputStreamWrapper(tarInputStream)); |
| } else { |
| // Workaround for the case when the entry is zero bytes big |
| answer.setBody(new ByteArrayInputStream(new byte[0])); |
| } |
| return answer; |
| } else { |
| LOGGER.trace("Closed tarInputStream"); |
| return null; |
| } |
| } catch (IOException exception) { |
| throw new RuntimeCamelException(exception); |
| } |
| } |
| |
| public void checkNullAnswer(Message answer) { |
| if (answer == null && tarInputStream != null) { |
| IOHelper.close(tarInputStream); |
| tarInputStream = null; |
| } |
| } |
| |
| private TarArchiveEntry getNextEntry() throws IOException { |
| TarArchiveEntry entry; |
| |
| while ((entry = tarInputStream.getNextTarEntry()) != null) { |
| if (!entry.isDirectory()) { |
| return entry; |
| } else { |
| if (allowEmptyDirectory) { |
| return entry; |
| } |
| } |
| } |
| |
| return null; |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| IOHelper.close(tarInputStream); |
| tarInputStream = null; |
| } |
| |
| public boolean isAllowEmptyDirectory() { |
| return allowEmptyDirectory; |
| } |
| |
| public void setAllowEmptyDirectory(boolean allowEmptyDirectory) { |
| this.allowEmptyDirectory = allowEmptyDirectory; |
| } |
| } |