blob: 3f64340d43b97de99f2822f5b3bef9ac95bc54e7 [file] [log] [blame]
package android.test;
import com.google.android.collect.Sets;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.ContentProvider;
import android.database.sqlite.SQLiteDatabase;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.Set;
/**
* This is a class which delegates to the given context, but performs database
* and file operations with a renamed database/file name (prefixes default
* names with a given prefix).
*/
public class RenamingDelegatingContext extends ContextWrapper {
private Context mFileContext;
private String mFilePrefix = null;
private Set<String> mDatabaseNames = Sets.newHashSet();
private Set<String> mFileNames = Sets.newHashSet();
public static <T extends ContentProvider> T providerWithRenamedContext(
Class<T> contentProvider, Context c, String filePrefix)
throws IllegalAccessException, InstantiationException {
return providerWithRenamedContext(contentProvider, c, filePrefix, false);
}
public static <T extends ContentProvider> T providerWithRenamedContext(
Class<T> contentProvider, Context c, String filePrefix,
boolean allowAccessToExistingFilesAndDbs)
throws IllegalAccessException, InstantiationException {
Class<T> mProviderClass = contentProvider;
T mProvider = mProviderClass.newInstance();
RenamingDelegatingContext mContext = new RenamingDelegatingContext(c, filePrefix);
if (allowAccessToExistingFilesAndDbs) {
mContext.makeExistingFilesAndDbsAccessible();
}
mProvider.attachInfo(mContext, null);
return mProvider;
}
/**
* Makes accessible all files and databases whose names match the filePrefix that was passed to
* the constructor. Normally only files and databases that were created through this context are
* accessible.
*/
public void makeExistingFilesAndDbsAccessible() {
String[] databaseList = mFileContext.databaseList();
for (String diskName : databaseList) {
if (shouldDiskNameBeVisible(diskName)) {
mDatabaseNames.add(publicNameFromDiskName(diskName));
}
}
String[] fileList = mFileContext.fileList();
for (String diskName : fileList) {
if (shouldDiskNameBeVisible(diskName)) {
mFileNames.add(publicNameFromDiskName(diskName));
}
}
}
/**
* Returns if the given diskName starts with the given prefix or not.
* @param diskName name of the database/file.
*/
boolean shouldDiskNameBeVisible(String diskName) {
return diskName.startsWith(mFilePrefix);
}
/**
* Returns the public name (everything following the prefix) of the given diskName.
* @param diskName name of the database/file.
*/
String publicNameFromDiskName(String diskName) {
if (!shouldDiskNameBeVisible(diskName)) {
throw new IllegalArgumentException("disk file should not be visible: " + diskName);
}
return diskName.substring(mFilePrefix.length(), diskName.length());
}
/**
* @param context : the context that will be delagated.
* @param filePrefix : a prefix with which database and file names will be
* prefixed.
*/
public RenamingDelegatingContext(Context context, String filePrefix) {
super(context);
mFileContext = context;
mFilePrefix = filePrefix;
}
/**
* @param context : the context that will be delagated.
* @param fileContext : the context that file and db methods will be delgated to
* @param filePrefix : a prefix with which database and file names will be
* prefixed.
*/
public RenamingDelegatingContext(Context context, Context fileContext, String filePrefix) {
super(context);
mFileContext = fileContext;
mFilePrefix = filePrefix;
}
public String getDatabasePrefix() {
return mFilePrefix;
}
private String renamedFileName(String name) {
return mFilePrefix + name;
}
@Override
public SQLiteDatabase openOrCreateDatabase(String name,
int mode, SQLiteDatabase.CursorFactory factory) {
final String internalName = renamedFileName(name);
if (!mDatabaseNames.contains(name)) {
mDatabaseNames.add(name);
mFileContext.deleteDatabase(internalName);
}
return mFileContext.openOrCreateDatabase(internalName, mode, factory);
}
@Override
public boolean deleteDatabase(String name) {
if (mDatabaseNames.contains(name)) {
mDatabaseNames.remove(name);
return mFileContext.deleteDatabase(renamedFileName(name));
} else {
return false;
}
}
@Override
public String[] databaseList() {
return mDatabaseNames.toArray(new String[]{});
}
@Override
public FileInputStream openFileInput(String name)
throws FileNotFoundException {
final String internalName = renamedFileName(name);
if (mFileNames.contains(name)) {
return mFileContext.openFileInput(internalName);
} else {
throw new FileNotFoundException(internalName);
}
}
@Override
public FileOutputStream openFileOutput(String name, int mode)
throws FileNotFoundException {
mFileNames.add(name);
return mFileContext.openFileOutput(renamedFileName(name), mode);
}
@Override
public File getFileStreamPath(String name) {
return mFileContext.getFileStreamPath(renamedFileName(name));
}
@Override
public boolean deleteFile(String name) {
if (mFileNames.contains(name)) {
mFileNames.remove(name);
return mFileContext.deleteFile(renamedFileName(name));
} else {
return false;
}
}
@Override
public String[] fileList() {
return mFileNames.toArray(new String[]{});
}
// /**
// * Given an array of files returns only those whose names indicate that they belong to this
// * context.
// * @param allFiles the original list of files
// * @return the pruned list of files
// */
// private String[] prunedFileList(String[] allFiles) {
// List<String> files = Lists.newArrayList();
// for (String file : allFiles) {
// if (file.startsWith(mFilePrefix)) {
// files.add(file);
// }
// }
// return files.toArray(new String[]{});
// }
}