org.apache.poi.hsmf.datatypes.DirectoryChunk Maven / Gradle / Ivy

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   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
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       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
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package org.apache.poi.hsmf.datatypes;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.poi.hsmf.MAPIMessage;
import org.apache.poi.hsmf.datatypes.Types.MAPIType;
import org.apache.poi.poifs.filesystem.DirectoryNode;

/**
 * A Chunk that is just a placeholder in the MAPIMessage directory structure,
 * which contains children. This is most commonly used with nested MAPIMessages
 */
public class DirectoryChunk extends Chunk {
    private DirectoryNode dir;

    public DirectoryChunk(DirectoryNode dir, String namePrefix, int chunkId, MAPIType type) {
        super(namePrefix, chunkId, type);
        this.dir = dir;
    }

    /**
     * Returns the directory entry for this chunk. You can then use standard
     * POIFS methods to enumerate the entries in it.
     */
    public DirectoryNode getDirectory() {
        return dir;
    }

    /**
     * Treats the directory as an embedded MAPIMessage (it normally is one), and
     * returns a MAPIMessage object to process it with.
     *
     * @since 4.1.1
     */
    public MAPIMessage getAsEmbeddedMessage() throws IOException {
        return new MAPIMessage(dir);
    }

    @Override
    public void readValue(InputStream value) {
        // DirectoryChunks have 0 byte contents
    }

    @Override
    public void writeValue(OutputStream out) {
        // DirectoryChunks have 0 byte contents
    }
}