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/*
* Copyright (C) 2016 The CyanogenMod Project
*
* 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 org.lineageos.settings.utils;
import android.util.Log;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public final class FileUtils {
private static final String TAG = "FileUtils";
private FileUtils() {
// This class is not supposed to be instantiated
}
/**
* Reads the first line of text from the given file.
* Reference {@link BufferedReader#readLine()} for clarification on what a
* line is
*
* @return the read line contents, or null on failure
*/
public static String readOneLine(String fileName) {
String line = null;
BufferedReader reader = null;
try {
reader = new BufferedReader(new FileReader(fileName), 512);
line = reader.readLine();
} catch (FileNotFoundException e) {
Log.w(TAG, "No such file " + fileName + " for reading", e);
} catch (IOException e) {
Log.e(TAG, "Could not read from file " + fileName, e);
} finally {
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
// Ignored, not much we can do anyway
}
}
return line;
}
/**
* Writes the given value into the given file
*
* @return true on success, false on failure
*/
public static boolean writeLine(String fileName, String value) {
BufferedWriter writer = null;
try {
writer = new BufferedWriter(new FileWriter(fileName));
writer.write(value);
} catch (FileNotFoundException e) {
Log.w(TAG, "No such file " + fileName + " for writing", e);
return false;
} catch (IOException e) {
Log.e(TAG, "Could not write to file " + fileName, e);
return false;
} finally {
try {
if (writer != null) {
writer.close();
}
} catch (IOException e) {
// Ignored, not much we can do anyway
}
}
return true;
}
/**
* Checks whether the given file exists
*
* @return true if exists, false if not
*/
public static boolean fileExists(String fileName) {
final File file = new File(fileName);
return file.exists();
}
/**
* Checks whether the given file is readable
*
* @return true if readable, false if not
*/
public static boolean isFileReadable(String fileName) {
final File file = new File(fileName);
return file.exists() && file.canRead();
}
/**
* Checks whether the given file is writable
*
* @return true if writable, false if not
*/
public static boolean isFileWritable(String fileName) {
final File file = new File(fileName);
return file.exists() && file.canWrite();
}
/**
* Deletes an existing file
*
* @return true if the delete was successful, false if not
*/
public static boolean delete(String fileName) {
final File file = new File(fileName);
boolean ok = false;
try {
ok = file.delete();
} catch (SecurityException e) {
Log.w(TAG, "SecurityException trying to delete " + fileName, e);
}
return ok;
}
/**
* Renames an existing file
*
* @return true if the rename was successful, false if not
*/
public static boolean rename(String srcPath, String dstPath) {
final File srcFile = new File(srcPath);
final File dstFile = new File(dstPath);
boolean ok = false;
try {
ok = srcFile.renameTo(dstFile);
} catch (SecurityException e) {
Log.w(TAG,
"SecurityException trying to rename " + srcPath + " to " + dstPath,
e);
} catch (NullPointerException e) {
Log.e(TAG,
"NullPointerException trying to rename " + srcPath + " to " +
dstPath,
e);
}
return ok;
}
}
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