TGPluginManager.java

package org.herac.tuxguitar.gui.system.plugins;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.herac.tuxguitar.gui.util.MessageDialog;
import org.herac.tuxguitar.util.TGClassLoader;
import org.herac.tuxguitar.util.TGServiceReader;

public class TGPluginManager {

  private List<TGPlugin> plugins;

  public TGPluginManager() {
    this.plugins = new ArrayList<TGPlugin>();
    this.initPlugins();
  }

  public void closePlugins() {
    for (final TGPlugin plugin : this.plugins) {
      try {
        plugin.close();
      } catch (TGPluginException exception) {
        MessageDialog.errorMessage(exception);
      } catch (Throwable throwable) {
        MessageDialog.errorMessage(new TGPluginException(
            "An error ocurred when trying to close plugin", throwable));
      }
    }
  }

  public String getEnabledProperty(TGPlugin plugin) {
    return (plugin.getClass().getName() + ".enabled");
  }

  public List<TGPlugin> getPlugins() {
    return this.plugins;
  }

  public void initPlugins() {
    try {
      // Search available providers
      Iterator it = TGServiceReader.lookupProviders(TGPlugin.class,
          TGClassLoader.instance().getClassLoader());
      while (it.hasNext()) {
        try {
          TGPlugin plugin = (TGPlugin) it.next();
          plugin.init();
          this.plugins.add(plugin);
        } catch (TGPluginException exception) {
          MessageDialog.errorMessage(exception);
        } catch (Throwable throwable) {
          MessageDialog.errorMessage(new TGPluginException(
              "An error ocurred when trying to init plugin", throwable));
        }
      }
    } catch (Throwable throwable) {
      MessageDialog.errorMessage(new TGPluginException(
          "An error ocurred when trying to init plugin", throwable));
    }
  }

  public boolean isEnabled(TGPlugin plugin) {
    try {
      return TGPluginProperties.instance().getBooleanConfigValue(
          getEnabledProperty(plugin), true);
    } catch (Throwable throwable) {
      MessageDialog.errorMessage(new TGPluginException(
          "An error ocurred when trying to get plugin status", throwable));
    }
    return false;
  }

  public void openPlugins() {
    for (final TGPlugin plugin : this.plugins) {
      try {
        plugin.setEnabled(isEnabled(plugin));
      } catch (TGPluginException exception) {
        MessageDialog.errorMessage(exception);
      } catch (Throwable throwable) {
        MessageDialog.errorMessage(new TGPluginException(
            "An error ocurred when trying to set plugin status", throwable));
      }
    }
  }

  public void setEnabled(TGPlugin plugin, boolean enabled) {
    try {
      TGPluginProperties.instance().setProperty(getEnabledProperty(plugin),
          enabled);
      TGPluginProperties.instance().save();
      plugin.setEnabled(enabled);
    } catch (TGPluginException exception) {
      MessageDialog.errorMessage(exception);
    } catch (Throwable throwable) {
      MessageDialog.errorMessage(new TGPluginException(
          "An error ocurred when trying to set plugin status", throwable));
    }
  }

}