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/*
* Copyright (C) 2008 Google Inc.
*
* 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.google.android.locationtracker.data;
import android.content.Context;
import android.database.Cursor;
import android.location.Location;
/**
* Helper class for writing and retrieving data using the TrackerProvider
* content provider
*
*/
public class TrackerDataHelper {
private Context mContext;
/** formats data output */
protected IFormatter mFormatter;
/** formats output as Comma separated value CSV file */
public static final IFormatter CSV_FORMATTER = new CSVFormatter();
/** formats output as KML file */
public static final IFormatter KML_FORMATTER = new KMLFormatter();
/** provides no formatting */
public static final IFormatter NO_FORMATTER = new IFormatter() {
public String getFooter() {
return "";
}
public String getHeader() {
return "";
}
public String getOutput(TrackerEntry entry) {
return "";
}
};
/**
* Creates instance
*
* @param context - content context
* @param formatter - formats the output from the get*Output* methods
*/
public TrackerDataHelper(Context context, IFormatter formatter) {
mContext = context;
mFormatter = formatter;
}
/**
* Creates a instance with no output formatting capabilities. Useful for
* clients that require write-only access
*/
public TrackerDataHelper(Context context) {
this(context, NO_FORMATTER);
}
/**
* insert given TrackerEntry into content provider
*/
void writeEntry(TrackerEntry entry) {
mContext.getContentResolver().insert(TrackerProvider.CONTENT_URI,
entry.getAsContentValues());
}
/**
* insert given location into tracker data
*/
public void writeEntry(Location loc, float distFromNetLoc) {
writeEntry(TrackerEntry.createEntry(loc, distFromNetLoc));
}
/**
* insert given log message into tracker data
*/
public void writeEntry(String tag, String logMsg) {
writeEntry(TrackerEntry.createEntry(tag, logMsg));
}
/**
* Deletes all tracker entries
*/
public void deleteAll() {
mContext.getContentResolver().delete(TrackerProvider.CONTENT_URI, null,
null);
}
/**
* Query tracker data, filtering by given tag
*
* @param tag
* @return Cursor to data
*/
public Cursor query(String tag, int limit) {
String selection = (tag == null ? null : TrackerEntry.TAG + "=?");
String[] selectionArgs = (tag == null ? null : new String[] {tag});
Cursor cursor = mContext.getContentResolver().query(
TrackerProvider.CONTENT_URI, TrackerEntry.ATTRIBUTES,
selection, selectionArgs, null);
if (cursor == null) {
return cursor;
}
int pos = (cursor.getCount() < limit ? 0 : cursor.getCount() - limit);
cursor.moveToPosition(pos);
return cursor;
}
/**
* Retrieves a cursor that starts at the last limit rows
*
* @param limit
* @return a cursor, null if bad things happened
*/
public Cursor query(int limit) {
return query(null, limit);
}
/**
* Query tracker data, filtering by given tag. mo limit to number of rows
* returned
*
* @param tag
* @return Cursor to data
*/
public Cursor query(String tag) {
return query(tag, Integer.MAX_VALUE);
}
/**
* Returns the output header particular to the associated formatter
*/
public String getOutputHeader() {
return mFormatter.getHeader();
}
/**
* Returns the output footer particular to the associated formatter
*/
public String getOutputFooter() {
return mFormatter.getFooter();
}
/**
* Helper method which converts row referenced by given cursor to a string
* output
*
* @param cursor
* @return CharSequence output, null if given cursor is invalid or no more
* data
*/
public String getNextOutput(Cursor cursor) {
if (cursor == null || cursor.isAfterLast()) {
return null;
}
String output = mFormatter.getOutput(TrackerEntry.createEntry(cursor));
cursor.moveToNext();
return output;
}
}
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