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Spring Framework example source code file (MapFactoryBean.java)

This example Spring Framework source code file (MapFactoryBean.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

abstractfactorybean, class, class, illegalargumentexception, illegalargumentexception, iterator, map, map, mapfactorybean, object, object, typeconverter, util

The Spring Framework MapFactoryBean.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.beans.factory.config;

import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.TypeConverter;
import org.springframework.core.GenericCollectionTypeResolver;
import org.springframework.core.JdkVersion;

/**
 * Simple factory for shared Map instances. Allows for central setup
 * of Maps via the "map" element in XML bean definitions.
 *
 * @author Juergen Hoeller
 * @since 09.12.2003
 * @see SetFactoryBean
 * @see ListFactoryBean
 */
public class MapFactoryBean extends AbstractFactoryBean {

	private Map sourceMap;

	private Class targetMapClass;


	/**
	 * Set the source Map, typically populated via XML "map" elements.
	 */
	public void setSourceMap(Map sourceMap) {
		this.sourceMap = sourceMap;
	}

	/**
	 * Set the class to use for the target Map. Can be populated with a fully
	 * qualified class name when defined in a Spring application context.
	 * <p>Default is a linked HashMap, keeping the registration order.
	 * @see java.util.LinkedHashMap
	 */
	public void setTargetMapClass(Class targetMapClass) {
		if (targetMapClass == null) {
			throw new IllegalArgumentException("'targetMapClass' must not be null");
		}
		if (!Map.class.isAssignableFrom(targetMapClass)) {
			throw new IllegalArgumentException("'targetMapClass' must implement [java.util.Map]");
		}
		this.targetMapClass = targetMapClass;
	}


	public Class getObjectType() {
		return Map.class;
	}

	protected Object createInstance() {
		if (this.sourceMap == null) {
			throw new IllegalArgumentException("'sourceMap' is required");
		}
		Map result = null;
		if (this.targetMapClass != null) {
			result = (Map) BeanUtils.instantiateClass(this.targetMapClass);
		}
		else {
			result = new LinkedHashMap(this.sourceMap.size());
		}
		Class keyType = null;
		Class valueType = null;
		if (this.targetMapClass != null && JdkVersion.isAtLeastJava15()) {
			keyType = GenericCollectionTypeResolver.getMapKeyType(this.targetMapClass);
			valueType = GenericCollectionTypeResolver.getMapValueType(this.targetMapClass);
		}
		if (keyType != null || valueType != null) {
			TypeConverter converter = getBeanTypeConverter();
			for (Iterator it = this.sourceMap.entrySet().iterator(); it.hasNext();) {
				Map.Entry entry = (Map.Entry) it.next();
				Object convertedKey = converter.convertIfNecessary(entry.getKey(), keyType);
				Object convertedValue = converter.convertIfNecessary(entry.getValue(), valueType);
				result.put(convertedKey, convertedValue);
			}
		}
		else {
			result.putAll(this.sourceMap);
		}
		return result;
	}

}

Other Spring Framework examples (source code examples)

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