item.java

这是AJAX的一个HTML实现！ HTML标签AJAX的实现！

/**
 * Copyright 2007 Jens Kapitza
 *
 * 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 net.sourceforge.ajaxtags.helpers;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * A generic item class, basically representing a name-value pair.
 * 
 * @author Darren L. Spurgeon
 * @author Jens Kapitza
 * @version $Revision$ $Date: 2007/07/22 18:04:50 $ $Author: jenskapitza $
 */
class Item<T> {

	/**
	 * set all attributes
	 * 
	 * @param attributes
	 *            the attributes to set
	 */
	public void setAllAttributes(Map<String, String> attributes) {
		if (attributes != null) {
			for (String key : attributes.keySet()) {
				setAttributes(key, attributes.get(key));
			}
		}
	}

	/**
	 * 
	 * @return the key set of the attributes
	 */
	public Set<String> getAttributeKeySet() {
		return this.attributes.keySet();
	}

	private Map<String, String> attributes = new HashMap<String, String>();

	/**
	 * removes an attribute
	 * 
	 * @param name
	 *            the name of attribute
	 */
	public void removeAttribute(final String name) {
		this.attributes.remove(name);
	}

	/**
	 * clear the attributes
	 */
	public void clearAttribute() {
		this.attributes.clear();
	}

	/**
	 * set an attribute to extend the item
	 * 
	 * @param name
	 *            the name for the attrubute
	 * @param value
	 *            the value for the attribute
	 */
	public void setAttributes(final String name, final String value) {
		setAttributes(name, value, false);
	}

	/**
	 * set an attribute to extend the item
	 * 
	 * @param name
	 *            the name for the attrubute
	 * @param value
	 *            the value for the attribute
	 * @param evenIfNull
	 *            set attribute even if it is null
	 */
	public void setAttributes(final String name, final String value,
			boolean evenIfNull) {
		if (value == null && !evenIfNull) {
			return; // don't set null attributes
		}
		this.attributes.put(name.toLowerCase(), value);
	}

	/**
	 * read the attribute value
	 * 
	 * @param name
	 *            the attribute name
	 * @return the value of attribute <code>name</code>
	 */
	public String getAttributeValue(final String name) {
		return this.attributes.get(name);
	}

	protected String name;

	protected T value;

	protected boolean asData;

	/**
	 * Constructor for Item.
	 */
	public Item() {
		super();
	}

	/**
	 * Constructor for Item.
	 * 
	 * @param name
	 *            the name for the item
	 * @param value
	 *            the value
	 * @param asData
	 *            response as CDATA
	 */
	public Item(String name, T value, boolean asData) {
		super();
		this.name = name;
		this.value = value;
		this.asData = asData;
	}

	/**
	 * @return Returns the name.
	 */
	public String getName() {
		return this.name;
	}

	/**
	 * @param name
	 *            The name to set.
	 */
	public void setName(String name) {
		this.name = name;
	}

	/**
	 * @return Returns the value.
	 */
	public T getValue() {
		return this.value;
	}

	/**
	 * @param value
	 *            The value to set.
	 */
	public void setValue(T value) {
		this.value = value;
	}

	/**
	 * @return Returns the asCData.
	 */
	public boolean isAsCData() {
		return this.asData;
	}

	/**
	 * @param asData
	 *            The asData to set.
	 */
	public void setAsData(boolean asData) {
		this.asData = asData;
	}

}