/*-
 * #%L
 * A library for building and introspecting structs.
 * %%
 * Copyright (C) 2021 - 2024 SciJava developers.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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 */

package org.scijava.struct;

import java.lang.reflect.Type;

/**
 * {@link Member} backed by a generic parameter of a
 * {@link FunctionalInterface}-annotated interface.
 * <p>
 * The generic parameter in question is indicated by annotating a {@link Class}
 * with {@link Parameter}.
 * </p>
 *
 * @author Curtis Rueden
 * @param <T>
 */
public class FunctionalParameterMember<T> extends AnnotatedParameterMember<T> {

	private Struct struct;

	public FunctionalParameterMember(final Type itemType,
		final Parameter annotation) throws ValidityException
	{
		super(itemType, annotation);
		final String key = key();
		if (key == null || key.isEmpty()) {
			throw new ValidityException("Functional parameter must specify key");
		}
		struct = isStruct() ? ParameterStructs.structOf(rawType()) : null;
	}

	@Override
	public Struct childStruct() {
		return struct;
	}
}
