TGMidiSequencerProviderPlugin.java

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

import org.herac.tuxguitar.gui.TuxGuitar;
import org.herac.tuxguitar.gui.system.plugins.TGPluginException;
import org.herac.tuxguitar.player.base.MidiSequencerProvider;

public abstract class TGMidiSequencerProviderPlugin extends TGPluginAdapter {
  private boolean loaded;
  private MidiSequencerProvider provider;

  protected void addPlugin() throws TGPluginException {
    if (!this.loaded) {
      try {
        TuxGuitar.instance().getPlayer().addSequencerProvider(this.provider,
            TuxGuitar.instance().isInitialized());
        this.loaded = true;
      } catch (Throwable throwable) {
        throw new TGPluginException(throwable.getMessage(), throwable);
      }
    }
  }

  public void close() throws TGPluginException {
    try {
      this.provider.closeAll();
    } catch (Throwable throwable) {
      throw new TGPluginException(throwable.getMessage(), throwable);
    }
  }

  protected abstract MidiSequencerProvider getProvider()
      throws TGPluginException;

  public void init() throws TGPluginException {
    this.provider = getProvider();
    this.loaded = false;
  }

  protected void removePlugin() throws TGPluginException {
    if (this.loaded) {
      try {
        TuxGuitar.instance().getPlayer().removeSequencerProvider(this.provider);
        this.loaded = false;
      } catch (Throwable throwable) {
        throw new TGPluginException(throwable.getMessage(), throwable);
      }
    }
  }

  public void setEnabled(boolean enabled) throws TGPluginException {
    if (enabled) {
      addPlugin();
    } else {
      removePlugin();
    }
  }
}