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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.application.api;
import com.yahoo.path.Path;
import java.io.*;
import java.util.ArrayList;
import java.util.List;
/**
* An application file represents a file within an application package. This class can be used to traverse the entire
* application package file structure, as well as read and write files to it, and create directories.
*
* @author Ulf Lilleengen
*/
public abstract class ApplicationFile implements Comparable<ApplicationFile> {
private static final String metaDir = ".meta";
public static final String ContentStatusNew = "new";
public static final String ContentStatusChanged = "changed";
public static final String ContentStatusDeleted = "deleted";
protected final Path path;
private static final PathFilter defaultFilter = path1 -> true;
protected ApplicationFile(Path path) {
this.path = path;
}
/**
* Check whether or not this file is a directory.
*
* @return true if it is, false if not.
*/
public abstract boolean isDirectory();
/**
* Test whether or not this file exists.
*
* @return true if it exists, false if not.
*/
public abstract boolean exists();
/**
* Create a {@link Reader} for the contents of this file.
*
* @return A {@link Reader} that should be closed after use.
* @throws FileNotFoundException if the file is not found.
*/
public abstract Reader createReader() throws FileNotFoundException;
/**
* Create an {@link InputStream} for the contents of this file.
*
* @return An {@link InputStream} that should be closed after use.
* @throws FileNotFoundException if the file is not found.
*/
public abstract InputStream createInputStream() throws FileNotFoundException;
/**
* Create a directory at the path represented by this file. Parent directories will
* be automatically created.
*
* @return this
* @throws IllegalArgumentException if the directory already exists.
*/
public abstract ApplicationFile createDirectory();
/**
* Write the contents from this reader to this file. Any existing content will be overwritten!
*
* @param input A reader pointing to the content that should be written.
* @return this
*/
public abstract ApplicationFile writeFile(Reader input);
/**
* Appends the given string to this text file.
*
* @return this
*/
public abstract ApplicationFile appendFile(String value);
/**
* List the files under this directory. If this is file, an empty list is returned.
* Only immediate files/subdirectories are returned.
*
* @return a list of files in this directory.
*/
public List<ApplicationFile> listFiles() {
return listFiles(defaultFilter);
}
/**
* List the files under this directory. If this is file, an empty list is returned.
* Only immediate files/subdirectories are returned.
*
* @param filter A filter functor for filtering path names
* @return a list of files in this directory.
*/
public abstract List<ApplicationFile> listFiles(PathFilter filter);
/**
* List the files in this directory, optionally list files for subdirectories recursively as well.
*
* @param recurse Set to true if all files in the directory tree should be returned.
* @return a list of files in this directory.
*/
public List<ApplicationFile> listFiles(boolean recurse) {
List<ApplicationFile> ret = new ArrayList<>();
List<ApplicationFile> files = listFiles();
ret.addAll(files);
if (recurse) {
for (ApplicationFile file : files) {
if (file.isDirectory()) {
ret.addAll(file.listFiles(recurse));
}
}
}
return ret;
}
/**
* Delete the file pointed to by this. If it is a non-empty directory, the operation will throw.
*
* @return this.
* @throws RuntimeException if the file is a directory and not empty.
*/
public abstract ApplicationFile delete();
/**
* Get the path that this file represents.
*
* @return a Path
*/
public Path getPath() {
return path;
}
@Override
public String toString() {
return path.toString();
}
@Override
public boolean equals(Object other) {
if (other instanceof ApplicationFile) {
return path.equals(((ApplicationFile) other).path);
}
return false;
}
protected Path getMetaPath() {
if (path.toString().equals("")) {
return Path.fromString(metaDir).append(".root");
} else {
return path.getParentPath().append(metaDir).append(path.getName());
}
}
public abstract MetaData getMetaData();
public abstract long getSize();
public static class MetaData {
public String status = "unknown";
public String md5 = "";
public MetaData() { }
public MetaData(String status, String md5) {
this.status = status;
this.md5= md5;
}
public String getStatus() {
return status;
}
public String getMd5() {
return md5;
}
}
public interface PathFilter {
boolean accept(Path path);
}
}
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