ClearInputsExecutor.java

/*
 * Copyright 2011-2013 PrimeFaces Extensions.
 *
 * 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.primefaces.extensions.showcase.controller.dynaform;

import javax.el.ELContext;
import javax.el.ValueExpression;
import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIComponent;
import javax.faces.component.UIInput;
import javax.faces.component.visit.VisitResult;

import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.StringUtils;

import org.primefaces.context.RequestContext;
import org.primefaces.extensions.util.visitcallback.VisitTaskExecutor;

/**
 * Executor to clear all input values of one row in pe:dynaForm.
 *
 * @author  Oleg Varaksin / last modified by $Author: $
 * @version $Revision: 1.0 $
 */
public class ClearInputsExecutor implements VisitTaskExecutor {

	private static final String INDEX_ATTR = "rcIndex";

	private ELContext elContext;
	private RequestContext requestContext;
	private String[] ids;
	private int index;

	public ClearInputsExecutor(ELContext elContext, RequestContext requestContext, String[] ids, int index) {
		this.elContext = elContext;
		this.requestContext = requestContext;
		this.ids = ids;
		this.index = index;
	}

	/**
	 * @see org.primefaces.extensions.util.visitcallback.VisitTaskExecutor
	 */
	public VisitResult execute(UIComponent component) {
		UIInput input = (UIInput) component;
		String id = input.getId();

		// reset UI
		input.resetValue();

		// reset value in bean
		if ("tableColumn".equals(id) || "inputValue".equals(id)) {
			ValueExpression ve = input.getValueExpression("value");
			if (ve != null) {
				ve.setValue(elContext, StringUtils.EMPTY);
			}
		} else if ("inputOffset".equals(id)) {
			ValueExpression ve = input.getValueExpression("value");
			if (ve != null) {
				ve.setValue(elContext, 0);
			}
		} else if ("valueOperator".equals(id)) {
			ValueExpression ve = input.getValueExpression("value");
			if (ve != null) {
				ve.setValue(elContext, "eq");
			}
		}

		// update the corresponding input during response
		requestContext.update(input.getClientId());

		// delete handled id from the list, so that similar inputs should not be executed again
		ArrayUtils.removeElement(ids, id);

		return (ids.length != 0) ? VisitResult.REJECT : VisitResult.COMPLETE;
	}

	/**
	 * @see org.primefaces.extensions.util.visitcallback.VisitTaskExecutor
	 */
	public boolean shouldExecute(UIComponent component) {
		if ((component instanceof EditableValueHolder) && ArrayUtils.contains(ids, component.getId())) {
			Integer idx = (Integer) component.getAttributes().get(INDEX_ATTR);
			if ((idx != null) && (index == idx)) {
				return true;
			}
		}

		return false;
	}
}