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/*
* Copyright (C) 2008 The Android Open Source 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 com.android.prefs;
import com.android.annotations.NonNull;
import java.io.File;
/**
* Manages the location of the android files (including emulator files, ddms config, debug keystore)
*/
public final class AndroidLocation {
/**
* Virtual Device folder inside the path returned by {@link #getFolder()}
*/
public static final String FOLDER_AVD = "avd";
/**
* Throw when the location of the android folder couldn't be found.
*/
public static final class AndroidLocationException extends Exception {
private static final long serialVersionUID = 1L;
public AndroidLocationException(String string) {
super(string);
}
}
private static String sPrefsLocation = null;
/**
* Returns the folder used to store android related files.
* @return an OS specific path, terminated by a separator.
* @throws AndroidLocationException
*/
@NonNull public final static String getFolder() throws AndroidLocationException {
if (sPrefsLocation == null) {
String home = findValidPath("ANDROID_SDK_HOME", "user.home", "HOME");
// if the above failed, we throw an exception.
if (home == null) {
throw new AndroidLocationException(
"Unable to get the Android SDK home directory.\n" +
"Make sure the environment variable ANDROID_SDK_HOME is set up.");
} else {
sPrefsLocation = home + File.separator + ".android" + File.separator;
}
}
// make sure the folder exists!
File f = new File(sPrefsLocation);
if (f.exists() == false) {
try {
f.mkdir();
} catch (SecurityException e) {
AndroidLocationException e2 = new AndroidLocationException(String.format(
"Unable to create folder '%1$s'. " +
"This is the path of preference folder expected by the Android tools.",
sPrefsLocation));
e2.initCause(e);
throw e2;
}
} else if (f.isFile()) {
throw new AndroidLocationException(sPrefsLocation +
" is not a directory! " +
"This is the path of preference folder expected by the Android tools.");
}
return sPrefsLocation;
}
/**
* Resets the folder used to store android related files. For testing.
*/
public final static void resetFolder() {
sPrefsLocation = null;
}
/**
* Checks a list of system properties and/or system environment variables for validity, and
* existing director, and returns the first one.
* @param names
* @return the content of the first property/variable.
*/
private static String findValidPath(String... names) {
for (String name : names) {
String path;
if (name.indexOf('.') != -1) {
path = System.getProperty(name);
} else {
path = System.getenv(name);
}
if (path != null) {
File f = new File(path);
if (f.isDirectory()) {
return path;
}
}
}
return null;
}
}
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