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Spring Framework example source code file (AbstractSingleCheckedElementTag.java)

This example Spring Framework source code file (AbstractSingleCheckedElementTag.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

abstractcheckedelementtag, abstractcheckedelementtag, abstractsinglecheckedelementtag, eval_page, eval_page, http, jspexception, jspexception, object, object, servlet, string

The Spring Framework AbstractSingleCheckedElementTag.java source code

/*
 * Copyright 2002-2008 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;

/**
 * Abstract base class to provide common methods for implementing
 * databinding-aware JSP tags for rendering a <i>single
 * HTML '<code>input' element with a 'type'
 * of '<code>checkbox' or 'radio'.
 *
 * @author Juergen Hoeller
 * @since 2.5.2
 */
public abstract class AbstractSingleCheckedElementTag extends AbstractCheckedElementTag {

	/**
	 * The value of the '<code>value' attribute.
	 */
	private Object value;

	/**
	 * The value of the '<code>label' attribute.
	 */
	private Object label;


	/**
	 * Set the value of the '<code>value' attribute.
	 * May be a runtime expression.
	 */
	public void setValue(Object value) {
		this.value = value;
	}

	/**
	 * Get the value of the '<code>value' attribute.
	 */
	protected Object getValue() {
		return this.value;
	}

	/**
	 * Set the value of the '<code>label' attribute.
	 * May be a runtime expression.
	 */
	public void setLabel(Object label) {
		this.label = label;
	}

	/**
	 * Get the value of the '<code>label' attribute.
	 */
	protected Object getLabel() {
		return this.label;
	}


	/**
	 * Renders the '<code>input(radio)' element with the configured
	 * {@link #setValue(Object) value}. Marks the element as checked if the
	 * value matches the {@link #getValue bound value}.
	 */
	protected int writeTagContent(TagWriter tagWriter) throws JspException {
		tagWriter.startTag("input");
		String id = resolveId();
		writeOptionalAttribute(tagWriter, "id", id);
		writeOptionalAttribute(tagWriter, "name", getName());
		writeOptionalAttributes(tagWriter);
		writeTagDetails(tagWriter);
		tagWriter.endTag();

		Object resolvedLabel = evaluate("label", getLabel());
		if (resolvedLabel != null) {
			tagWriter.startTag("label");
			tagWriter.writeAttribute("for", id);
			tagWriter.appendValue(resolvedLabel.toString());
			tagWriter.endTag();
		}

		return EVAL_PAGE;
	}

	/**
	 * Write the details for the given primary tag:
	 * i.e. special attributes and the tag's value.
	 */
	protected abstract void writeTagDetails(TagWriter tagWriter) throws JspException;

}

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