DataComposerFactory.java

/**
 * Copyright 2005-2010 hdiv.org
 *
 * 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.hdiv.dataComposer;

import org.hdiv.config.HDIVConfig;
import org.hdiv.exception.HDIVException;
import org.hdiv.idGenerator.UidGenerator;
import org.hdiv.session.ISession;
import org.hdiv.util.EncodingUtil;
import org.hdiv.util.HDIVUtil;

/**
 * DataComposer object factory, more efficient than to use the Spring factory.
 * 
 * @author Gotzon Illarramendi
 * @since HDIV 2.1.0
 */
public class DataComposerFactory {

	/**
	 * HDIV configuration object.
	 */
	private HDIVConfig hdivConfig;
	
	/**
	 * Http session wrapper
	 */
	private ISession session;
	
	/**
	 * State saving stategy
	 */
	private String strategy;
	
	/**
	 * Unique Id generator
	 */
	private UidGenerator uidGenerator;
	
	/**
	 * Maximum size allowed to represent page state
	 */
	private int allowedLength;
	
	/**
	 * Utility methods for encoding
	 */
	private EncodingUtil encodingUtil;

	/**
	 * Creates a new instance of DataComposer based on the defined strategy.
	 * 
	 * @return IDataComposer instance
	 */
	public IDataComposer newInstance(){
		
		if (this.strategy.equalsIgnoreCase("memory")) {
			DataComposerMemory composer = new DataComposerMemory();
			composer.setHdivConfig(this.hdivConfig);
			composer.setSession(this.session);
			composer.setUidGenerator(this.uidGenerator);
			composer.init();
			return composer;
			
		} else if (this.strategy.equalsIgnoreCase("cipher")) {
			DataComposerCipher composer = new DataComposerCipher();
			composer.setHdivConfig(this.hdivConfig);
			composer.setSession(this.session);
			composer.setUidGenerator(this.uidGenerator);
			composer.setAllowedLength(this.allowedLength);
			composer.setEncodingUtil(this.encodingUtil);
			composer.init();
			return composer;
			
		} else if (this.strategy.equalsIgnoreCase("hash")) {
			DataComposerHash composer = new DataComposerHash();
			composer.setHdivConfig(this.hdivConfig);
			composer.setSession(this.session);
			composer.setUidGenerator(this.uidGenerator);
			composer.setAllowedLength(this.allowedLength);
			composer.setEncodingUtil(this.encodingUtil);
			composer.init();
			return composer;
			
		} else {
			String errorMessage = HDIVUtil.getMessage("strategy.error", this.strategy);
			throw new HDIVException(errorMessage);
		}
		
	}
	
	public void setHdivConfig(HDIVConfig hdivConfig) {
		this.hdivConfig = hdivConfig;
	}

	public void setSession(ISession session) {
		this.session = session;
	}
	
	public void setStrategy(String strategy) {
		this.strategy = strategy;
	}

	public void setUidGenerator(UidGenerator uidGenerator) {
		this.uidGenerator = uidGenerator;
	}

	public void setAllowedLength(int allowedLength) {
		this.allowedLength = allowedLength;
	}

	public void setEncodingUtil(EncodingUtil encodingUtil) {
		this.encodingUtil = encodingUtil;
	}
	
}