SelectableDsrHandler.java

/*
  SelectableDsrHandler.java

  (c) 2013-2015 Ed Swartz

  All rights reserved. This program and the accompanying materials
  are made available under the terms of the Eclipse Public License v1.0
  which accompanies this distribution, and is available at
  http://www.eclipse.org/legal/epl-v10.html
 */
package v9t9.common.dsr;

import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import v9t9.common.machine.IMachine;
import ejs.base.properties.IProperty;
import ejs.base.properties.IPropertyListener;
import ejs.base.settings.ISettingSection;

/**
 * @author ejs
 *
 */
public class SelectableDsrHandler implements ISelectableDsrHandler {

	protected Map<Object,IDsrHandler> selToDsrMap;
	protected IProperty selectorProperty;
	protected IPropertyListener selectorListener;
	protected IDsrHandler currentDsr;
	protected IMachine machine;

	public SelectableDsrHandler(IMachine machine, IProperty selectorProperty,
			Object... valueAndDsrPairs) {
		this.machine = machine;
		selToDsrMap = new HashMap<Object, IDsrHandler>();
		for (int i = 0; i < valueAndDsrPairs.length; i += 2) {
			selToDsrMap.put(valueAndDsrPairs[i], (IDsrHandler) valueAndDsrPairs[i+1]);
		}
		
		this.selectorProperty = selectorProperty;
		selectorListener = new IPropertyListener() {
			
			@Override
			public void propertyChanged(IProperty property) {
				IDsrHandler newDsr = selToDsrMap.get(property.getValue());
				if (newDsr == null) {
					System.err.println("unknown DSR selection: " + property);
					return;
				}
				if (currentDsr != null) {
					currentDsr.dispose();
				}
				currentDsr = newDsr;
				currentDsr.init();
			}
		};
		selectorProperty.addListenerAndFire(selectorListener);
	}

	/* (non-Javadoc)
	 * @see v9t9.common.dsr.IDsrHandler#init()
	 */
	@Override
	public void init() {
		if (currentDsr == null)
			throw new IllegalStateException("no DSR enabled for " + selectorProperty);
	}
	
	/* (non-Javadoc)
	 * @see v9t9.common.dsr.IDsrHandler#dispose()
	 */
	@Override
	public void dispose() {
		for (IDsrHandler dsr : selToDsrMap.values()) {
			dsr.dispose();
		}
		selToDsrMap.clear();
	}

	/* (non-Javadoc)
	 * @see v9t9.common.dsr.IDsrHandler#getName()
	 */
	@Override
	public String getName() {
		return getCurrentDsr().getName();
	}

	/* (non-Javadoc)
	 * @see v9t9.common.dsr.IDsrHandler#getDeviceIndicatorProviders()
	 */
	@Override
	public List<IDeviceIndicatorProvider> getDeviceIndicatorProviders() {
		return getCurrentDsr().getDeviceIndicatorProviders();
	}

	/* (non-Javadoc)
	 * @see ejs.base.properties.IPersistable#saveState(ejs.base.settings.ISettingSection)
	 */
	@Override
	public void saveState(ISettingSection section) {
		for (IDsrHandler dsr : selToDsrMap.values()) {
			dsr.saveState(section);
		}
	}

	/* (non-Javadoc)
	 * @see ejs.base.properties.IPersistable#loadState(ejs.base.settings.ISettingSection)
	 */
	@Override
	public void loadState(ISettingSection section) {
		for (IDsrHandler dsr : selToDsrMap.values()) {
			dsr.loadState(section);
		}

	}

	/* (non-Javadoc)
	 * @see v9t9.common.dsr.IDeviceSettings#getEditableSettingGroups()
	 */
	@Override
	public Map<String, Collection<IProperty>> getEditableSettingGroups() {
		return getCurrentDsr().getEditableSettingGroups();
	}

	/* (non-Javadoc)
	 * @see v9t9.common.dsr.ISelectableDsr#getSelectionProperty()
	 */
	@Override
	public IProperty getSelectionProperty() {
		return selectorProperty;
	}

	/* (non-Javadoc)
	 * @see v9t9.common.dsr.ISelectableDsr#getCurrentDsr()
	 */
	@Override
	public IDsrHandler getCurrentDsr() {
		return currentDsr;
	}

}