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package org.scijava.ui;

import org.scijava.module.Module;
import org.scijava.module.ModuleException;
import org.scijava.module.process.PreprocessorPlugin;
import org.scijava.plugin.Parameter;
import org.scijava.widget.AbstractInputHarvester;
import org.scijava.widget.InputHarvester;

/**
 * AbstractInputHarvesterPlugin is an {@link InputHarvester} that implements the
 * {@link PreprocessorPlugin} interface. It is intended to be extended by
 * UI-specific implementations such as {@code SwingInputHarvester}.
 * 
 * The input harvester will first check whether the default UI matches that of
 * its implementation; for example, the Swing-based input harvester plugin will
 * only harvest inputs if the Swing UI is currently the default one.
 * 
 * 
 * @author Curtis Rueden
 * @author Barry DeZonia
 * @param  The type of UI component housing the input panel itself.
 * @param  The type of UI component housing each input widget.
 */
public abstract class AbstractInputHarvesterPlugin extends
	AbstractInputHarvester implements PreprocessorPlugin
{

	@Parameter(required = false)
	private UIService uiService;

	private String cancelReason;

	// -- ModuleProcessor methods --

	@Override
	public void process(final Module module) {
		if (uiService == null) return; // no UI service means no input harvesting!

		// do not harvest if the UI is inactive!
		if (!uiService.isVisible(getUI())) return;

		// proceed with input harvesting
		try {
			harvest(module);
		}
		catch (final ModuleException e) {
			cancel(e.getMessage());
		}
	}

	// -- Cancelable methods --

	@Override
	public boolean isCanceled() {
		return cancelReason != null;
	}

	@Override
	public void cancel(final String reason) {
		cancelReason = reason == null ? "" : reason;
	}

	@Override
	public String getCancelReason() {
		return cancelReason;
	}

	// -- Internal methods --

	/** Gets the name (or class name) of the input harvester's affiliated UI. */
	protected abstract String getUI();

}