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Spring Framework example source code file (ManagedList.java)

This example Spring Framework source code file (ManagedList.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

arraylist, beanmetadataelement, beanmetadataelement, cannot, illegalargumentexception, illegalstateexception, list, list, managedlist, managedlist, mergeable, not, object, object, util

The Spring Framework ManagedList.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.support;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.BeanMetadataElement;
import org.springframework.beans.Mergeable;

/**
 * Tag collection class used to hold managed List elements, which may
 * include runtime bean references (to be resolved into bean objects).
 *
 * @author Rod Johnson
 * @author Rob Harrop
 * @author Juergen Hoeller
 * @since 27.05.2003
 */
public class ManagedList extends ArrayList implements Mergeable, BeanMetadataElement {

	private Object source;

	private boolean mergeEnabled;


	public ManagedList() {
	}

	public ManagedList(int initialCapacity) {
		super(initialCapacity);
	}


	/**
	 * Set the configuration source <code>Object for this metadata element.
	 * <p>The exact type of the object will depend on the configuration mechanism used.
	 */
	public void setSource(Object source) {
		this.source = source;
	}

	public Object getSource() {
		return this.source;
	}

	/**
	 * Set whether merging should be enabled for this collection,
	 * in case of a 'parent' collection value being present.
	 */
	public void setMergeEnabled(boolean mergeEnabled) {
		this.mergeEnabled = mergeEnabled;
	}

	public boolean isMergeEnabled() {
		return this.mergeEnabled;
	}

	public Object merge(Object parent) {
		if (!this.mergeEnabled) {
			throw new IllegalStateException("Not allowed to merge when the 'mergeEnabled' property is set to 'false'");
		}
		if (parent == null) {
			return this;
		}
		if (!(parent instanceof List)) {
			throw new IllegalArgumentException("Cannot merge with object of type [" + parent.getClass() + "]");
		}
		List merged = new ManagedList();
		merged.addAll((List) parent);
		merged.addAll(this);
		return merged;
	}

}

Other Spring Framework examples (source code examples)

Here is a short list of links related to this Spring Framework ManagedList.java source code file:

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