CommandModuleItem.java

/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
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 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
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 *    this list of conditions and the following disclaimer.
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package org.scijava.command;

import java.lang.reflect.Field;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

import org.scijava.ItemIO;
import org.scijava.ItemVisibility;
import org.scijava.Optional;
import org.scijava.module.AbstractModuleItem;
import org.scijava.module.ModuleInfo;
import org.scijava.module.ModuleItem;
import org.scijava.plugin.Attr;
import org.scijava.plugin.Parameter;
import org.scijava.util.ConversionUtils;
import org.scijava.util.GenericUtils;

/**
 * {@link ModuleItem} implementation describing an input or output of a command.
 * 
 * @author Curtis Rueden
 */
public class CommandModuleItem<T> extends AbstractModuleItem<T> {

	private final Field field;

	public CommandModuleItem(final ModuleInfo info, final Field field) {
		super(info);
		this.field = field;
	}

	// -- CommandModuleItem methods --

	public Field getField() {
		return field;
	}

	public Parameter getParameter() {
		return field.getAnnotation(Parameter.class);
	}

	// -- ModuleItem methods --

	@Override
	public Class<T> getType() {
		final Class<?> type =
			GenericUtils.getFieldClasses(field, getDelegateClass()).get(0);
		@SuppressWarnings("unchecked")
		final Class<T> typedType = (Class<T>) type;
		return typedType;
	}

	@Override
	public Type getGenericType() {
		return GenericUtils.getFieldType(field, getDelegateClass());
	}

	@Override
	public ItemIO getIOType() {
		return getParameter().type();
	}

	@Override
	public ItemVisibility getVisibility() {
		return getParameter().visibility();
	}

	@Override
	public boolean isAutoFill() {
		return getParameter().autoFill();
	}

	@Override
	public boolean isRequired() {
		return getParameter().required() &&
			!Optional.class.isAssignableFrom(getType());
	}

	@Override
	public boolean isPersisted() {
		return getParameter().persist();
	}

	@Override
	public String getPersistKey() {
		return getParameter().persistKey();
	}

	@Override
	public String getInitializer() {
		return getParameter().initializer();
	}

	@Override
	public String getCallback() {
		return getParameter().callback();
	}

	@Override
	public String getWidgetStyle() {
		return getParameter().style();
	}

	@Override
	public T getMinimumValue() {
		return tValue(getParameter().min());
	}

	@Override
	public T getMaximumValue() {
		return tValue(getParameter().max());
	}

	@Override
	public Number getStepSize() {
		final String value = getParameter().stepSize();
		try {
			final double stepSize = Double.parseDouble(value);
			return stepSize;
		}
		catch (final NumberFormatException exc) {
			return tValue(value, Number.class);
		}
	}

	@Override
	public int getColumnCount() {
		return getParameter().columns();
	}

	@Override
	public List<T> getChoices() {
		final String[] choices = getParameter().choices();
		if (choices.length == 0) return super.getChoices();

		final ArrayList<T> choiceList = new ArrayList<T>();
		for (final String choice : getParameter().choices()) {
			choiceList.add(tValue(choice));
		}
		return choiceList;
	}

	// -- BasicDetails methods --

	@Override
	public String getLabel() {
		return getParameter().label();
	}

	@Override
	public String getDescription() {
		return getParameter().description();
	}

	@Override
	public boolean is(final String key) {
		for (final Attr attr : getParameter().attrs()) {
			if (attr.name().equals(key)) return true;
		}
		return false;
	}

	@Override
	public String get(final String key) {
		for (final Attr attr : getParameter().attrs()) {
			if (attr.name().equals(key)) return attr.value();
		}
		return null;
	}

	// -- Named methods --

	@Override
	public String getName() {
		return field.getName();
	}

	// -- Helper methods --

	private T tValue(final String value) {
		return tValue(value, getType());
	}

	private <D> D tValue(final String value, final Class<D> type) {
		if (value == null || value.isEmpty()) return null;
		final Class<D> saneType = ConversionUtils.getNonprimitiveType(type);
		return ConversionUtils.convert(value, saneType);
	}

}