exvideocontainer.java

来自「EXCEL read and write」· Java 代码 · 共 109 行

/*
* 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.hslf.record;

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

import org.apache.poi.util.LittleEndian;
import org.apache.poi.util.POILogger;

/**
 * A container record that specifies information about external video data.
 *
 * @author Yegor Kozlov
 */
public class ExVideoContainer extends RecordContainer {
	private byte[] _header;

	// Links to our more interesting children
	private ExMediaAtom mediaAtom;
    //the UNC or local path to a video file.
    private CString pathAtom;

	/**
	 * Set things up, and find our more interesting children
	 */
	protected ExVideoContainer(byte[] source, int start, int len) {
		// Grab the header
		_header = new byte[8];
		System.arraycopy(source,start,_header,0,8);

		// Find our children
		_children = Record.findChildRecords(source,start+8,len-8);
		findInterestingChildren();
	}

	/**
	 * Go through our child records, picking out the ones that are
	 *  interesting, and saving those for use by the easy helper
	 *  methods.
	 */	
	private void findInterestingChildren() {

		// First child should be the ExMediaAtom
		if(_children[0] instanceof ExMediaAtom) {
			mediaAtom = (ExMediaAtom)_children[0];
		} else {
			logger.log(POILogger.ERROR, "First child record wasn't a ExMediaAtom, was of type " + _children[0].getRecordType());
		}
        if(_children[1] instanceof CString) {
            pathAtom = (CString)_children[1];
        } else {
            logger.log(POILogger.ERROR, "Second child record wasn't a CString, was of type " + _children[1].getRecordType());
        }
	}

	/**
	 * Create a new ExVideoContainer, with blank fields
	 */
	public ExVideoContainer() {
        // Setup our header block
		_header = new byte[8];
		_header[0] = 0x0f; // We are a container record
		LittleEndian.putShort(_header, 2, (short)getRecordType());
		
        _children = new Record[2];
		_children[0] = mediaAtom = new ExMediaAtom();
		_children[1] = pathAtom = new CString();
	}

	/**
	 * We are of type 4103
	 */
	public long getRecordType() { return RecordTypes.ExVideoContainer.typeID; }

	/**
	 * Write the contents of the record back, so it can be written
	 *  to disk
	 */
	public void writeOut(OutputStream out) throws IOException {
		writeOut(_header[0],_header[1],getRecordType(),_children,out);
	}

    /**
     * Returns the ExMediaAtom of this link
     */
    public ExMediaAtom getExMediaAtom() { return mediaAtom; }

    /**
     * Returns the Path Atom (CString) of this link
     */
    public CString getPathAtom() { return pathAtom; }

}