struts2RestJpaBootstrap - generic action

GenericAction.java

package org.demo.action;

import java.util.List;

import org.demo.business.service.IServices;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;

public abstract class GenericAction<T, PK> extends ActionSupport
{
	private static final long serialVersionUID = 1L;
	public static final String RESULT_FORM = "form" ;
	public static final String RESULT_LIST = "list" ;
	
	protected final Logger LOG = LoggerFactory.getLogger(GenericAction.class);
	
	protected T current = null ;
	protected PK restid = null;
	protected List<T> searchResult = null ;
	
	/**
	 * @return
	 */
	protected abstract IServices<T, PK> getServices();
	
	/**
	 * @return
	 * @throws Exception
	 */
	public String load() throws Exception {
		if (LOG.isDebugEnabled()) LOG.debug("Method 'load'");
		innerload();
		return RESULT_FORM ;
	}

	/**
	 * @return
	 * @throws Exception
	 */
	public String save() throws Exception {
		if (LOG.isDebugEnabled()) {
			LOG.debug("Method 'save'");
			LOG.debug("Form values : " + current );
		}

		if (current != null) {
			getServices().save(current);
			addActionMessage(getText("entity.save"));
		} else {
			addActionError(getText("entity.nothing.to.save"));
		}
		
		return RESULT_FORM ;
	}

	/**
	 * @return
	 * @throws Exception
	 */
	public String search() throws Exception {
		if (LOG.isDebugEnabled()) {
			LOG.debug("Method 'search'");
			LOG.debug("Form values : " + current );
		}
		
		searchResult = getServices().search( current );
		if (LOG.isDebugEnabled()) LOG.debug("After SEARCH : count = " + searchResult.size() );
		if ( searchResult.size() > 1 ) {
			final String[] args = {Integer.toString(searchResult.size())};
			final String text = getText("entity.found.many", args);
			addActionMessage(text);
			return RESULT_LIST ; // Go to the list page
		}
		else if ( searchResult.size() == 1 ) {
			current = searchResult.get(0);
			addActionMessage(getText("entity.found.one"));
			return RESULT_FORM ; // Go to the list page
		}
		else {
			addActionMessage(getText("entity.nothing.found"));
			return RESULT_FORM ; // Stay on the form page
		}
	}

	/**
	 * @return
	 * @throws Exception
	 */
	public String delete() throws Exception {
		if (LOG.isDebugEnabled()) {
			LOG.debug("Method 'delete'");
			LOG.debug("Id send : " + restid );
		}
		getServices().delete(restid);
		return RESULT_FORM ;
	}

	/**
	 * TODO est-ce util ?
	 */
	public String clear() {
		if (LOG.isDebugEnabled()) LOG.debug("Method 'clear'");
		this.current = null;
		this.restid = null;
		this.searchResult = null;
		return RESULT_FORM ; // Stay on the form page
	}

	/**
	 * @throws Exception
	 */
	protected void innerload() throws Exception {
		if (LOG.isDebugEnabled()) LOG.debug("ID is valid : try to LOAD ...");
		current = getServices().load(restid);
		if ( current != null ) {
			addActionMessage(getText("entity.found"));
		}
		else {
			addActionError(getText("entity.not.found"));
		}
	}


}