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 * SciJava Common shared library for SciJava software.
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package org.scijava.display;

import org.scijava.Priority;
import org.scijava.module.Module;
import org.scijava.module.ModuleItem;
import org.scijava.module.ModuleService;
import org.scijava.module.process.AbstractPreprocessorPlugin;
import org.scijava.module.process.PreprocessorPlugin;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;

/**
 * Assigns the active {@link Display} when there is one single unresolved
 * {@link Display} parameter. Hence, rather than a dialog prompting the user to
 * choose a {@link Display}, the active {@link Display} is used automatically.
 * <p>
 * In the case of more than one {@link Display} parameter, the active
 * {@link Display} is not used and instead the user must select. This behavior
 * is consistent with ImageJ v1.x.
 * </p>
 * 
 * @author Curtis Rueden
 */
@Plugin(type = PreprocessorPlugin.class, priority = Priority.VERY_HIGH)
public class ActiveDisplayPreprocessor extends AbstractPreprocessorPlugin {

	@Parameter(required = false)
	private DisplayService displayService;

	@Parameter(required = false)
	private ModuleService moduleService;

	// -- ModuleProcessor methods --

	@Override
	public void process(final Module module) {
		if (displayService == null || moduleService == null) return;

		final ModuleItem<?> displayInput =
			moduleService.getSingleInput(module, Display.class);
		if (displayInput == null || !displayInput.isAutoFill()) return;

		@SuppressWarnings("unchecked")
		final Class<? extends Display<?>> displayType =
			(Class<? extends Display<?>>) displayInput.getType();

		final Display<?> activeDisplay =
			displayService.getActiveDisplay(displayType);
		if (activeDisplay == null) return;

		final String name = displayInput.getName();
		module.setInput(name, activeDisplay);
		module.resolveInput(name);
	}

}
