/*
 * Copyright 2002-2018 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.web.servlet.tags.form;

import javax.servlet.jsp.JspException;

import org.springframework.web.bind.WebDataBinder;

/**
 * Databinding-aware JSP tag for rendering multiple HTML '{@code input}'
 * elements with a '{@code type}' of '{@code checkbox}'.
 *
 * <p>Intended to be used with a Collection as the {@link #getItems()} bound value}.
 *
 * @author Thomas Risberg
 * @author Juergen Hoeller
 * @author Mark Fisher
 * @since 2.5
 */
@SuppressWarnings("serial")
public class CheckboxesTag extends AbstractMultiCheckedElementTag {

	@Override
	protected int writeTagContent(TagWriter tagWriter) throws JspException {
		super.writeTagContent(tagWriter);

		if (!isDisabled()) {
			// Write out the 'field was present' marker.
			tagWriter.startTag("input");
			tagWriter.writeAttribute("type", "hidden");
			String name = WebDataBinder.DEFAULT_FIELD_MARKER_PREFIX + getName();
			tagWriter.writeAttribute("name", name);
			tagWriter.writeAttribute("value", processFieldValue(name, "on", "hidden"));
			tagWriter.endTag();
		}

		return SKIP_BODY;
	}

	@Override
	protected String getInputType() {
		return "checkbox";
	}

}
