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/*
* Copyright (C) 2015 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.googlecode.android_scripting.interpreter;
import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.MatrixCursor;
import android.net.Uri;
import android.preference.PreferenceManager;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* A provider that can be queried to obtain execution-related interpreter info.
*
* <p>
* To create an interpreter APK, please extend this content provider and implement getDescriptor()
* and getEnvironmentSettings().<br>
* Please declare the provider in the android manifest xml (the authority values has to be set to
* your_package_name.provider_name).
*
* @author Alexey Reznichenko (alexey.reznichenko@gmail.com)
*/
public abstract class InterpreterProvider extends ContentProvider {
private static final int PROPERTIES = 1;
private static final int ENVIRONMENT_VARIABLES = 2;
private static final int ARGUMENTS = 3;
private UriMatcher mUriMatcher;
private SharedPreferences mPreferences;
private InterpreterDescriptor mDescriptor;
private Context mContext;
public static final String MIME = "vnd.android.cursor.item/vnd.googlecode.interpreter";
public InterpreterProvider() {
mUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
String auth = this.getClass().getName().toLowerCase();
mUriMatcher.addURI(auth, InterpreterConstants.PROVIDER_PROPERTIES, PROPERTIES);
mUriMatcher.addURI(auth, InterpreterConstants.PROVIDER_ENVIRONMENT_VARIABLES,
ENVIRONMENT_VARIABLES);
mUriMatcher.addURI(auth, InterpreterConstants.PROVIDER_ARGUMENTS, ARGUMENTS);
}
/**
* Returns an instance of the class that implements the desired {@link InterpreterDescriptor}.
*/
protected abstract InterpreterDescriptor getDescriptor();
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
return 0;
}
@Override
public String getType(Uri uri) {
return MIME;
}
@Override
public Uri insert(Uri uri, ContentValues values) {
return null;
}
@Override
public boolean onCreate() {
mDescriptor = getDescriptor();
mContext = getContext();
mPreferences = PreferenceManager.getDefaultSharedPreferences(mContext);
return false;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
if (!isInterpreterInstalled()) {
return null;
}
Map<String, String> map;
switch (mUriMatcher.match(uri)) {
case PROPERTIES:
map = getProperties();
break;
case ENVIRONMENT_VARIABLES:
map = getEnvironmentVariables();
break;
case ARGUMENTS:
map = getArguments();
break;
default:
map = null;
}
return buildCursorFromMap(map);
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
return 0;
}
private boolean isInterpreterInstalled() {
return mPreferences.getBoolean(InterpreterConstants.INSTALLED_PREFERENCE_KEY, false);
}
private Cursor buildCursorFromMap(Map<String, String> map) {
if (map == null) {
return null;
}
MatrixCursor cursor = new MatrixCursor(map.keySet().toArray(new String[map.size()]));
cursor.addRow(map.values());
return cursor;
}
private Map<String, String> getProperties() {
Map<String, String> values = new HashMap<String, String>();
values.put(InterpreterPropertyNames.NAME, mDescriptor.getName());
values.put(InterpreterPropertyNames.NICE_NAME, mDescriptor.getNiceName());
values.put(InterpreterPropertyNames.EXTENSION, mDescriptor.getExtension());
values.put(InterpreterPropertyNames.BINARY, mDescriptor.getBinary(mContext).getAbsolutePath());
values.put(InterpreterPropertyNames.INTERACTIVE_COMMAND, mDescriptor
.getInteractiveCommand(mContext));
values.put(InterpreterPropertyNames.SCRIPT_COMMAND, mDescriptor.getScriptCommand(mContext));
values.put(InterpreterPropertyNames.HAS_INTERACTIVE_MODE, Boolean.toString(mDescriptor
.hasInteractiveMode()));
return values;
}
private Map<String, String> getEnvironmentVariables() {
Map<String, String> values = new HashMap<String, String>();
values.putAll(mDescriptor.getEnvironmentVariables(mContext));
return values;
}
private Map<String, String> getArguments() {
Map<String, String> values = new LinkedHashMap<String, String>();
int column = 0;
for (String argument : mDescriptor.getArguments(mContext)) {
values.put(Integer.toString(column), argument);
column++;
}
return values;
}
}
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