import org.apache.hadoop.hdfs.util.Diff.Container; //导入依赖的package包/类
/** @return the child with the given name. */
INode getChild(byte[] name, boolean checkPosterior,
    INodeDirectory currentDir) {
  for(DirectoryDiff d = this; ; d = d.getPosterior()) {
    final Container<INode> returned = d.diff.accessPrevious(name);
    if (returned != null) {
      // the diff is able to determine the inode
      return returned.getElement();
    } else if (!checkPosterior) {
      // Since checkPosterior is false, return null, i.e. not found.
      return null;
    } else if (d.getPosterior() == null) {
      // no more posterior diff, get from current inode.
      return currentDir.getChild(name, Snapshot.CURRENT_STATE_ID);
    }
  }
}
 

import org.apache.hadoop.hdfs.util.Diff.Container; //导入依赖的package包/类
/** @return the child with the given name. */
INode getChild(byte[] name, boolean checkPosterior,
    INodeDirectory currentDir) {
  for(DirectoryDiff d = this; ; d = d.getPosterior()) {
    final Container<INode> returned = d.diff.accessPrevious(name);
    if (returned != null) {
      // the diff is able to determine the inode
      return returned.getElement(); 
    } else if (!checkPosterior) {
      // Since checkPosterior is false, return null, i.e. not found.   
      return null;
    } else if (d.getPosterior() == null) {
      // no more posterior diff, get from current inode.
      return currentDir.getChild(name, null);
    }
  }
}