| /* |
| * 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.zipfile; |
| |
| import java.io.BufferedInputStream; |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Iterator; |
| import java.util.zip.ZipEntry; |
| import java.util.zip.ZipInputStream; |
| |
| 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.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * The Iterator which can go through the ZipInputStream according to ZipEntry |
| * Based on the thread <a href="http://camel.465427.n5.nabble.com/zip-file-best-practices-td5713437.html">zip file best practices</a> |
| */ |
| public class ZipIterator implements Iterator<Message>, Closeable { |
| static final Logger LOGGER = LoggerFactory.getLogger(ZipIterator.class); |
| |
| private final Exchange exchange; |
| private boolean allowEmptyDirectory; |
| private volatile ZipInputStream zipInputStream; |
| private volatile Message parent; |
| |
| public ZipIterator(Exchange exchange, InputStream inputStream) { |
| this.exchange = exchange; |
| this.allowEmptyDirectory = false; |
| if (inputStream instanceof ZipInputStream) { |
| zipInputStream = (ZipInputStream) inputStream; |
| } else { |
| zipInputStream = new ZipInputStream(new BufferedInputStream(inputStream)); |
| } |
| parent = null; |
| } |
| |
| @Override |
| public boolean hasNext() { |
| try { |
| if (zipInputStream == null) { |
| return false; |
| } |
| boolean availableDataInCurrentEntry = zipInputStream.available() == 1; |
| if (!availableDataInCurrentEntry) { |
| // advance to the next entry. |
| parent = getNextElement(); |
| if (parent == null) { |
| zipInputStream.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 (zipInputStream == null) { |
| return null; |
| } |
| |
| try { |
| ZipEntry current = getNextEntry(); |
| |
| if (current != null) { |
| LOGGER.debug("read zipEntry {}", current.getName()); |
| Message answer = new DefaultMessage(exchange.getContext()); |
| answer.getHeaders().putAll(exchange.getIn().getHeaders()); |
| answer.setHeader("zipFileName", current.getName()); |
| answer.setHeader(Exchange.FILE_NAME, current.getName()); |
| answer.setBody(new ZipInputStreamWrapper(zipInputStream)); |
| return answer; |
| } else { |
| LOGGER.trace("close zipInputStream"); |
| return null; |
| } |
| } catch (IOException exception) { |
| throw new RuntimeCamelException(exception); |
| } |
| } |
| |
| public void checkNullAnswer(Message answer) { |
| if (answer == null && zipInputStream != null) { |
| IOHelper.close(zipInputStream); |
| zipInputStream = null; |
| } |
| } |
| |
| private ZipEntry getNextEntry() throws IOException { |
| ZipEntry entry; |
| |
| while ((entry = zipInputStream.getNextEntry()) != 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(zipInputStream); |
| zipInputStream = null; |
| } |
| |
| public boolean isSupportIteratorForEmptyDirectory() { |
| return allowEmptyDirectory; |
| } |
| |
| public void setAllowEmptyDirectory(boolean allowEmptyDirectory) { |
| this.allowEmptyDirectory = allowEmptyDirectory; |
| } |
| } |