basexmlbuilder.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.xml;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

/**
 * Helper class to build valid XML as a base for all xmlbuilder
 * 
 * @author Jens Kapitza
 * @version $Revision$ $Date: 2007/07/22 16:58:28 $ $Author: jenskapitza $
 * @param <V>
 *            Listtype (Item, TreeItem)
 */
abstract class BaseXmlBuilder<V> {

	private List<V> liste = new ArrayList<V>();

	protected void setListe(List<V> liste) {
		this.liste = liste;
	}

	/**
	 * default encoding is utf-8
	 */
	private String encoding = "UTF-8";

	/**
	 * @return the xml encoding
	 */
	public String getEncoding() {
		return this.encoding;
	}

	/**
	 * set the xml encoding
	 * 
	 * @param encoding
	 */
	public void setEncoding(String encoding) {
		this.encoding = encoding;
	}

	protected List<V> getListe() {
		return this.liste;
	}

	/**
	 * 
	 * @return the item list
	 */
	protected List<V> getItems() {
		return getListe();
	}

	/**
	 * 
	 * @return the xml body, xml encoding is added by {@link #toString()}
	 */
	protected abstract String getXMLString();

	/**
	 * return the full XML ducument
	 */
	@Override
	public String toString() {
		StringBuffer xml = new StringBuffer().append("<?xml version=\"1.0\"");
		if (getEncoding() != null) {
			xml.append(" encoding=\"");
			xml.append(getEncoding());
			xml.append("\"");
		}
		xml.append(" ?>");
		xml.append(getXMLString());

		return xml.toString();
	}

	/**
	 * add item to list
	 * 
	 * @param o
	 *            the item to add
	 * @return BaseXmlBuilder
	 * @see ArrayList#add(Object)
	 */
	public BaseXmlBuilder<V> add(V o) {
		this.liste.add(o);
		return this;
	}

	/**
	 * delete all items
	 */
	public void clear() {
		this.liste.clear();
	}

	/**
	 * return the item at index
	 * 
	 * @param index
	 *            the index
	 * @return the item at index
	 */
	public V get(int index) {
		return this.liste.get(index);
	}

	/**
	 * check if itemlist is empty
	 * 
	 * @return true if it is empty else false
	 */
	public boolean isEmpty() {
		return this.liste.isEmpty();
	}

	/**
	 * 
	 * @return the item count
	 */
	public int size() {
		return this.liste.size();
	}

	    /**
     * use getNAME from object!
     * 
     * @param obj
     * @param name
     * @return
     * @throws NoSuchMethodException
     * @throws SecurityException
     * @throws InvocationTargetException
     * @throws IllegalAccessException
     * @throws IllegalArgumentException
     */
    @SuppressWarnings("unchecked")
    protected static <T> T getProperty(Object obj, String name)
	    throws Exception {
	String xname = Character.toUpperCase(name.charAt(0))
		+ name.substring(1);
	Method m = obj.getClass().getMethod("get" + xname, (Class<?>[]) null);
	m.setAccessible(true);
	return (T) m.invoke(obj, (Object[]) null);
    }
}