Android Open Source - PlayerHater Config

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License

The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2013 Chris Rhoden, Rebecca Nesson, Public Radio Exchange
 * //from  w ww . ja  va  2 s. c  o  m
 * 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.prx.playerhater.util;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.prx.playerhater.PlayerHater;
import org.prx.playerhater.PlayerHaterPlugin;
import org.prx.playerhater.R;
import org.prx.playerhater.plugins.PluginCollection;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ServiceInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.res.Resources;
import android.content.res.XmlResourceParser;
import android.content.res.Resources.NotFoundException;
import android.os.Parcel;
import android.os.Parcelable;

public class Config implements Parcelable {
  private static final String EXTRA_CONFIG = "config";
  private static Config sInstance;

  public static void attachToIntent(Intent intent) {
    if (sInstance != null) {
      intent.putExtra(EXTRA_CONFIG, sInstance);
    }
  }

  public static Config fromIntent(Intent intent) {
    return intent.getExtras().getParcelable(Config.EXTRA_CONFIG);
  }

  public static Config getInstance(Context context) {
    if (sInstance == null) {
      sInstance = new Config(context);
    }
    return sInstance;
  }

  public PluginCollection run(Context context, PlayerHater playerHater) {
    PluginCollection collection = new PluginCollection();
    return run(context, playerHater, collection);
  }

  public PluginCollection run(Context context, PlayerHater playerHater,
      PluginCollection collection) {
    collection.writeLock();
    for (Class<? extends PlayerHaterPlugin> pluginKlass : getPlugins()) {
      try {
        PlayerHaterPlugin plugin = pluginKlass.newInstance();
        collection.add(plugin);
      } catch (Exception e) {
        Log.e("Could not instantiate plugin "
            + pluginKlass.getCanonicalName(), e);
      }
    }
    collection.onPlayerHaterLoaded(context, playerHater);
    collection.unWriteLock();
    return collection;
  }

  private final Set<String> mPlugins = new HashSet<String>();

  private Config(Context context) {
    XmlResourceParser parser = context.getResources().getXml(
        R.xml.zzz_ph_config_defaults);
    load(parser, context);
    try {
      ServiceInfo info = context.getPackageManager().getServiceInfo(
          PlayerHater.buildServiceIntent(context).getComponent(),
          PackageManager.GET_META_DATA);
      if (info != null && info.metaData != null) {
        int id = info.metaData.getInt("org.prx.playerhater.Config", 0);
        if (id != 0) {
          parser = context.getResources().getXml(id);
          load(parser, context);
        }
      }
    } catch (NameNotFoundException e) {
      // If this happens, we can just use the default configuration.
    }
  }

  private Set<Class<? extends PlayerHaterPlugin>> getPlugins() {
    return getPlugins(mPlugins);
  }

  @SuppressWarnings("unchecked")
  private Set<Class<? extends PlayerHaterPlugin>> getPlugins(
      Set<String> strings) {
    Set<Class<? extends PlayerHaterPlugin>> plugins = new HashSet<Class<? extends PlayerHaterPlugin>>();
    for (String pluginName : strings) {
      try {
        plugins.add((Class<? extends PlayerHaterPlugin>) Class
            .forName(pluginName));
      } catch (Exception e) {
        Log.e("Can't load plugin " + pluginName, e);
      }
    }
    return plugins;
  }

  @Override
  public int describeContents() {
    return 0;
  }

  @Override
  public void writeToParcel(Parcel dest, int flags) {
    dest.writeStringArray(getPluginsArray());
  }

  public static final Parcelable.Creator<Config> CREATOR = new Parcelable.Creator<Config>() {

    @Override
    public Config createFromParcel(Parcel in) {
      return new Config(in);
    }

    @Override
    public Config[] newArray(int size) {
      return new Config[size];
    }
  };

  private static final int PLUGIN = 1;
  private static final int INVALID_TAG = -1;

  private Config(Parcel in) {
    setPluginsArray(in.createStringArray());
  }

  private String[] getPluginsArray() {
    return mPlugins.toArray(new String[mPlugins.size() - 1]);
  }

  private void setPluginsArray(String[] plugins) {
    setStringArray(plugins, mPlugins);
  }

  private void setStringArray(String[] stuff, Set<String> in) {
    in.clear();
    Collections.addAll(in, stuff);
  }

  private void load(XmlResourceParser parser, Context context) {
    Resources res = context.getResources();
    try {
      parser.next();
      int eventType = parser.getEventType();
      boolean pluginEnabled = false;
      boolean pluginDisabled = false;
      String pluginName = null;
      int currentTagType = INVALID_TAG;

      while (eventType != XmlResourceParser.END_DOCUMENT) {
        if (eventType == XmlResourceParser.START_TAG) {
          if (parser.getName().equals("plugin")) {
            currentTagType = PLUGIN;
          }
          pluginEnabled = loadBooleanOrResourceBoolean(res, parser,
              "enabled", true);
          pluginDisabled = loadBooleanOrResourceBoolean(res, parser,
              "disabled", false);

          pluginName = parser.getAttributeValue(null, "name");
        } else if (eventType == XmlResourceParser.END_TAG) {
          switch (currentTagType) {
          case PLUGIN:
            if (pluginEnabled && pluginName != null) {
              mPlugins.add(pluginName);
            } else if (pluginDisabled && pluginName != null) {
              mPlugins.remove(pluginName);
            }
            break;
          }
        }
        eventType = parser.next();
      }
    } catch (Exception e) {

    }
  }

  private boolean loadBooleanOrResourceBoolean(Resources res,
      XmlResourceParser parser, String attrName, boolean def) {
    int id;
    boolean result = def;
    try {
      id = parser.getAttributeResourceValue(null, attrName, 0);
      if (id != 0) {
        try {
          result = res.getBoolean(id);
        } catch (NotFoundException e) {
          result = parser.getAttributeBooleanValue(null, attrName,
              def);
        }
      } else {
        result = parser.getAttributeBooleanValue(null, attrName, def);
      }
    } catch (Exception e) {
      return result;
    }
    return result;
  }
}

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