Spring Framework example source code file (AbstractAttributes.java)

This example Spring Framework source code file (AbstractAttributes.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

abstractattributes, attributes, class, class, collection, collection, iterator, linkedlist, linkedlist, list, object, object, reflection, util

The Spring Framework AbstractAttributes.java source code

/*
 * Copyright 2002-2005 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.metadata.support;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import org.springframework.metadata.Attributes;

/**
 * Convenient superclass for Attributes implementations.
 * Implements filtering and saves attribute packages.
 *
 * <p>TODO could implement caching here for efficiency,
 * or add a caching decorator (probably a better idea).
 *
 * @author Rod Johnson
 */
public abstract class AbstractAttributes implements Attributes {
	
	/**
	 * @see org.springframework.metadata.Attributes#getAttributes(java.lang.Class, java.lang.Class)
	 */
	public final Collection getAttributes(Class targetClass, Class filter) {
		return filter(getAttributes(targetClass), filter);
	}

	/**
	 * Filter these attributes to those matching the filter type
	 */
	private Collection filter(Collection coll, Class filter) {
		if (filter == null) {
			return coll;
		}

		List matches = new LinkedList();
		for (Iterator it = coll.iterator(); it.hasNext(); ) {
			Object next = it.next();
			if (filter.isInstance(next)) {
				matches.add(next);
			}
		}
		return matches;
	}

	/**
	 * @see org.springframework.metadata.Attributes#getAttributes(java.lang.reflect.Method, java.lang.Class)
	 */
	public final Collection getAttributes(Method targetMethod, Class filter) {
		return filter(getAttributes(targetMethod), filter);
	}

	/**
	 * @see org.springframework.metadata.Attributes#getAttributes(java.lang.reflect.Field, java.lang.Class)
	 */
	public final Collection getAttributes(Field targetField, Class filter) {
		return filter(getAttributes(targetField), filter);
	}

}