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/*
* Copyright 2008 CoreMedia AG, Hamburg
*
* Licensed 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 com.googlecode.mp4parser;
import com.coremedia.iso.BoxParser;
import com.coremedia.iso.boxes.Box;
import com.coremedia.iso.boxes.ContainerBox;
import com.googlecode.mp4parser.util.ByteBufferByteChannel;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Logger;
/**
* Abstract base class suitable for most boxes acting purely as container for other boxes.
*/
public abstract class AbstractContainerBox extends AbstractBox implements ContainerBox {
private static Logger LOG = Logger.getLogger(AbstractContainerBox.class.getName());
protected List<Box> boxes = new LinkedList<Box>();
protected BoxParser boxParser;
@Override
protected long getContentSize() {
long contentSize = 0;
for (Box boxe : boxes) {
contentSize += boxe.getSize();
}
return contentSize;
}
public AbstractContainerBox(String type) {
super(type);
}
public List<Box> getBoxes() {
return Collections.unmodifiableList(boxes);
}
public void setBoxes(List<Box> boxes) {
this.boxes = new LinkedList<Box>(boxes);
}
@SuppressWarnings("unchecked")
public <T extends Box> List<T> getBoxes(Class<T> clazz) {
return getBoxes(clazz, false);
}
@SuppressWarnings("unchecked")
public <T extends Box> List<T> getBoxes(Class<T> clazz, boolean recursive) {
List<T> boxesToBeReturned = new ArrayList<T>(2);
for (Box boxe : boxes) {
//clazz.isInstance(boxe) / clazz == boxe.getClass()?
// I hereby finally decide to use isInstance
if (clazz.isInstance(boxe)) {
boxesToBeReturned.add((T) boxe);
}
if (recursive && boxe instanceof ContainerBox) {
boxesToBeReturned.addAll(((ContainerBox) boxe).getBoxes(clazz, recursive));
}
}
return boxesToBeReturned;
}
/**
* Add <code>b</code> to the container and sets the parent correctly.
*
* @param b will be added to the container
*/
public void addBox(Box b) {
b.setParent(this);
boxes.add(b);
}
public void removeBox(Box b) {
b.setParent(this);
boxes.remove(b);
}
@Override
public void parse(ReadableByteChannel readableByteChannel, ByteBuffer header, long contentSize, BoxParser boxParser) throws IOException {
this.boxParser = boxParser;
super.parse(readableByteChannel, header, contentSize, boxParser);
}
@Override
public void _parseDetails(ByteBuffer content) {
parseChildBoxes(content);
}
public String toString() {
StringBuilder buffer = new StringBuilder();
buffer.append(this.getClass().getSimpleName()).append("[");
for (int i = 0; i < boxes.size(); i++) {
if (i > 0) {
buffer.append(";");
}
buffer.append(boxes.get(i).toString());
}
buffer.append("]");
return buffer.toString();
}
/**
* The number of bytes from box start (first length byte) to the
* first length byte of the first child box
*
* @return offset to first child box
*/
public long getNumOfBytesToFirstChild() {
return 8;
}
@Override
protected void getContent(ByteBuffer byteBuffer) {
writeChildBoxes(byteBuffer);
}
protected final void parseChildBoxes(ByteBuffer content) {
try {
while (content.remaining() >= 8) { // 8 is the minimal size for a sane box
boxes.add(boxParser.parseBox(new ByteBufferByteChannel(content), this));
}
if (content.remaining() != 0) {
setDeadBytes(content.slice());
LOG.warning("Something's wrong with the sizes. There are dead bytes in a container box.");
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
protected final void writeChildBoxes(ByteBuffer bb) {
WritableByteChannel wbc = new ByteBufferByteChannel(bb);
for (Box box : boxes) {
try {
box.getBox(wbc);
} catch (IOException e) {
// My WritableByteChannel won't throw any excpetion
throw new RuntimeException("Cannot happen to me", e);
}
}
}
}
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