jodd.petite.resolver.CtorResolver Maven / Gradle / Ivy

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// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// 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 HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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package jodd.petite.resolver;

import jodd.introspector.ClassDescriptor;
import jodd.introspector.ClassIntrospector;
import jodd.introspector.CtorDescriptor;
import jodd.petite.PetiteException;
import jodd.petite.def.BeanReferences;
import jodd.petite.def.CtorInjectionPoint;

import java.lang.reflect.Constructor;

/**
 * Resolver for constructor injection points.
 */
public class CtorResolver {

	protected final ReferencesResolver referencesResolver;

	public CtorResolver(final ReferencesResolver referencesResolver) {
		this.referencesResolver = referencesResolver;
	}

	/**
	 * Resolves constructor injection point from type. Looks for single annotated constructor.
	 * If no annotated constructors found, the total number of constructors will be checked.
	 * If there is only one constructor, that one will be used as injection point. If more
	 * constructors exist, the default one will be used as injection point. Otherwise, exception
	 * is thrown.
	 */
	public CtorInjectionPoint resolve(final Class type, final boolean useAnnotation) {
		// lookup methods
		ClassDescriptor cd = ClassIntrospector.get().lookup(type);
		CtorDescriptor[] allCtors = cd.getAllCtorDescriptors();
		Constructor foundedCtor = null;
		Constructor defaultCtor = null;
		BeanReferences[] references = null;

		for (CtorDescriptor ctorDescriptor : allCtors) {
			Constructor ctor = ctorDescriptor.getConstructor();

			Class[] paramTypes = ctor.getParameterTypes();
			if (paramTypes.length == 0) {
				defaultCtor = ctor;     // detects default ctors
			}

			if (!useAnnotation) {
				continue;
			}

			BeanReferences[] ctorReferences = referencesResolver.readAllReferencesFromAnnotation(ctor);

			if (ctorReferences == null) {
				continue;
			}
			if (foundedCtor != null) {
				throw new PetiteException("Two or more constructors are annotated as injection points in the bean: " + type.getName());
			}

			foundedCtor = ctor;
			references = ctorReferences;
		}

		if (foundedCtor == null) {
			// there is no annotated constructor
			if (allCtors.length == 1) {
				foundedCtor = allCtors[0].getConstructor();
			} else {
				foundedCtor = defaultCtor;
			}

			if (foundedCtor == null) {
				// no matching ctor found
				// still this is not an error if bean is already instantiated.
				return CtorInjectionPoint.EMPTY;
			}

			references = referencesResolver.readAllReferencesFromAnnotation(foundedCtor);

			if (references == null) {
				references = new BeanReferences[0];
			}
		}

		return new CtorInjectionPoint(foundedCtor, references);
	}

}