| /* ==================================================================== |
| 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.poi.hsmf.datatypes; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| |
| import org.apache.poi.hsmf.datatypes.Types.MAPIType; |
| import org.apache.poi.poifs.filesystem.DirectoryNode; |
| import org.apache.poi.poifs.filesystem.DocumentInputStream; |
| import org.apache.poi.poifs.filesystem.DocumentNode; |
| import org.apache.poi.util.IOUtils; |
| |
| /** |
| * A Chunk that either acts as {@link ByteChunk} (if not initialized with a node) or |
| * lazy loads its binary data from the document (if linked with a node via {@link #readValue(DocumentNode)}). |
| */ |
| public class ByteChunkDeferred extends ByteChunk { |
| |
| private DocumentNode node; |
| |
| /** |
| * Creates a Byte Stream Chunk, with the specified type. |
| */ |
| public ByteChunkDeferred(String namePrefix, int chunkId, MAPIType type) { |
| super(namePrefix, chunkId, type); |
| } |
| |
| /** |
| * Links the chunk to a document |
| * @param node the document node |
| */ |
| public void readValue(DocumentNode node) { |
| this.node = node; |
| } |
| |
| public void readValue(InputStream value) throws IOException { |
| if (node == null) { |
| super.readValue(value); |
| } |
| } |
| |
| @Override |
| public void writeValue(OutputStream out) throws IOException { |
| if (node == null) { |
| super.writeValue(out); |
| return; |
| } |
| |
| try (DocumentInputStream dis = createDocumentInputStream()) { |
| IOUtils.copy(dis, out); |
| } |
| } |
| |
| /** |
| * Get bytes directly. |
| */ |
| public byte[] getValue() { |
| if (node == null) { |
| return super.getValue(); |
| } |
| |
| try (DocumentInputStream dis = createDocumentInputStream()) { |
| return IOUtils.toByteArray(dis, node.getSize()); |
| } catch (IOException e) { |
| return null; |
| } |
| } |
| |
| /** |
| * Set bytes directly. |
| * <p> |
| * updating the linked document node/msg file directly would be unexpected, |
| * so we remove the link and act as a ByteChunk from then |
| */ |
| public void setValue(byte[] value) { |
| node = null; |
| super.setValue(value); |
| } |
| |
| private DocumentInputStream createDocumentInputStream() throws IOException { |
| return ((DirectoryNode) node.getParent()).createDocumentInputStream(node); |
| } |
| } |