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/*
* Copyright 2012 Sebastian Annies, 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.util;
import com.coremedia.iso.IsoFile;
import com.coremedia.iso.boxes.Box;
import com.coremedia.iso.boxes.ContainerBox;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Path {
private Path() {
}
static Pattern component = Pattern.compile("(....|\\.\\.)(\\[(.*)\\])?");
public static String createPath(Box box) {
return createPath(box, "");
}
private static String createPath(Box box, String path) {
if (box instanceof IsoFile) {
return path;
} else {
List<?> boxesOfBoxType = box.getParent().getBoxes(box.getClass());
int index = boxesOfBoxType.indexOf(box);
path = String.format("/%s[%d]", box.getType(), index) + path;
return createPath(box.getParent(), path);
}
}
public static Box getPath(Box box, String path) {
List<Box> all = getPaths(box, path);
return all.isEmpty() ? null : all.get(0);
}
public static List<Box> getPaths(Box box, String path) {
if (path.startsWith("/")) {
Box isoFile = box;
while (isoFile.getParent() != null) {
isoFile = isoFile.getParent();
}
assert isoFile instanceof IsoFile : isoFile.getType() + " has no parent";
return getPaths(isoFile, path.substring(1));
} else if (path.isEmpty()) {
return Collections.singletonList(box);
} else {
String later;
String now;
if (path.contains("/")) {
later = path.substring(path.indexOf('/') + 1);
now = path.substring(0, path.indexOf('/'));
} else {
now = path;
later = "";
}
Matcher m = component.matcher(now);
if (m.matches()) {
String type = m.group(1);
if ("..".equals(type)) {
return getPaths(box.getParent(), later);
} else {
int index = -1;
if (m.group(2) != null) {
// we have a specific index
String indexString = m.group(3);
index = Integer.parseInt(indexString);
}
List<Box> children = new LinkedList<Box>();
int currentIndex = 0;
for (Box box1 : ((ContainerBox) box).getBoxes()) {
if (box1.getType().matches(type)) {
if (index == -1 || index == currentIndex) {
children.addAll(getPaths(box1, later));
}
currentIndex++;
}
}
return children;
}
} else {
throw new RuntimeException(now + " is invalid path.");
}
}
}
public static boolean isContained(Box box, String path) {
assert path.startsWith("/") : "Absolute path required";
return getPaths(box, path).contains(box);
}
}
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