juneau-core/juneau-marshall/src/main/java/org/apache/juneau/httppart/bean/Utils.java

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// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance            *
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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
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package org.apache.juneau.httppart.bean;

import java.lang.annotation.*;

import org.apache.juneau.annotation.*;
import org.apache.juneau.reflection.*;

/**
 * Utility methods.
 */
class Utils {

	static void assertNoArgs(MethodInfo m, Class<?> a) throws InvalidAnnotationException {
		if (m.getParameterTypes().length != 0)
			throw new InvalidAnnotationException("Method with @{0} annotation cannot have arguments.  Method=''{1}''", a.getSimpleName(), m);
	}

	static void assertReturnNotVoid(MethodInfo m, Class<?> a) throws InvalidAnnotationException {
		ClassInfo rt = m.getReturnType();
		if (rt.is(void.class))
			throw new InvalidAnnotationException("Invalid return type for method with annotation @{0}.  Method=''{1}''", a.getSimpleName(), m);
	}

	static void assertReturnType(MethodInfo m, Class<? extends Annotation> a, Class<?>...c) throws InvalidAnnotationException {
		ClassInfo rt = m.getReturnType();
		for (Class<?> cc : c)
			if (rt.is(cc))
				return;
		throw new InvalidAnnotationException("Invalid return type for method with annotation @{0}.  Method=''{1}''", a.getSimpleName(), m);
	}

	static void assertArgType(MethodInfo m, Class<? extends Annotation> a, Class<?>...c) throws InvalidAnnotationException {
		Class<?>[] ptt = m.getParameterTypes();
		if (ptt.length != 1)
			throw new InvalidAnnotationException("Only one parameter can be passed to method with @{0} annotation.  Method=''{0}''", a.getSimpleName(), m);
		Class<?> rt = ptt[0];
		for (Class<?> cc : c)
			if (rt == cc)
				return;
		throw new InvalidAnnotationException("Invalid return type for method with annotation @{0}.  Method=''{1}''", a.getSimpleName(), m);
	}
}