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Spring Framework example source code file (AssignableTypeFilter.java)

This example Spring Framework source code file (AssignableTypeFilter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

abstracttypehierarchytraversingfilter, assignabletypefilter, assignabletypefilter, boolean, boolean, class, class, classnotfoundexception, override, override

The Spring Framework AssignableTypeFilter.java source code

/*
 * Copyright 2002-2007 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.core.type.filter;

/**
 * A simple filter which matches classes that are assignable to a given type.
 *
 * @author Rod Johnson
 * @author Mark Fisher
 * @author Ramnivas Laddad
 * @since 2.5
 */
public class AssignableTypeFilter extends AbstractTypeHierarchyTraversingFilter {

	private final Class targetType;


	/**
	 * Create a new AssignableTypeFilter for the given type.
	 * @param targetType the type to match
	 */
	public AssignableTypeFilter(Class targetType) {
		super(true, true);
		this.targetType = targetType;
	}


	@Override
	protected boolean matchClassName(String className) {
		return this.targetType.getName().equals(className);
	}

	@Override
	protected Boolean matchSuperClass(String superClassName) {
		return matchTargetType(superClassName);
	}

	@Override
	protected Boolean matchInterface(String interfaceName) {
		return matchTargetType(interfaceName);
	}

	protected Boolean matchTargetType(String typeName) {
		if (this.targetType.getName().equals(typeName)) {
			return true;
		}
		else if (Object.class.getName().equals(typeName)) {
			return Boolean.FALSE;
		}
		else if (typeName.startsWith("java.")) {
			try {
				Class clazz = getClass().getClassLoader().loadClass(typeName);
				return Boolean.valueOf(this.targetType.isAssignableFrom(clazz));
			}
			catch (ClassNotFoundException ex) {
				// Class not found - can't determine a match that way.
			}
		}
		return null;
	}

}

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