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/**
 * Licensed under the Common Development and Distribution License,
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.sun.com/cddl/
 *   
 * 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 com.sun.facelets.el;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import javax.el.FunctionMapper;

import com.sun.facelets.util.ReflectionUtil;

/**
 * Default implementation of the FunctionMapper
 * 
 * @see java.lang.reflect.Method
 * @see javax.el.FunctionMapper
 * 
 * @author Jacob Hookom
 * @version $Id: DefaultFunctionMapper.java,v 1.5 2006/10/19 03:48:12 jhook Exp $
 */
public final class DefaultFunctionMapper extends FunctionMapper implements
		Externalizable {

	private static final long serialVersionUID = 1L;

	private Map functions = null;

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.el.FunctionMapper#resolveFunction(java.lang.String,
	 *      java.lang.String)
	 */
	public Method resolveFunction(String prefix, String localName) {
		if (this.functions != null) {
			Function f = (Function) this.functions
					.get(prefix + ":" + localName);
			return f.getMethod();
		}
		return null;
	}

	public void addFunction(String prefix, String localName, Method m) {
		if (this.functions == null) {
			this.functions = new HashMap();
		}
		Function f = new Function(prefix, localName, m);
		synchronized (this) {
			this.functions.put(prefix + ":" + localName, f);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.io.Externalizable#writeExternal(java.io.ObjectOutput)
	 */
	public void writeExternal(ObjectOutput out) throws IOException {
		out.writeObject(this.functions);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.io.Externalizable#readExternal(java.io.ObjectInput)
	 */
	public void readExternal(ObjectInput in) throws IOException,
			ClassNotFoundException {
		this.functions = (Map) in.readObject();
	}

	public String toString() {
		StringBuffer sb = new StringBuffer(128);
		sb.append("FunctionMapper[\n");
		for (Iterator itr = this.functions.values().iterator(); itr.hasNext();) {
			sb.append(itr.next()).append('\n');
		}
		sb.append(']');
		return sb.toString();
	}

	private static class Function implements Externalizable {

		private static final long serialVersionUID = 1L;

		protected transient Method m;

		protected String owner;

		protected String name;

		protected String[] types;

		protected String prefix;

		protected String localName;

		/**
		 * 
		 */
		public Function(String prefix, String localName, Method m) {
			if (localName == null) {
				throw new NullPointerException("LocalName cannot be null");
			}
			if (m == null) {
				throw new NullPointerException("Method cannot be null");
			}
			this.prefix = prefix;
			this.localName = localName;
			this.m = m;
		}

		public Function() {
			// for serialization
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see java.io.Externalizable#writeExternal(java.io.ObjectOutput)
		 */
		public void writeExternal(ObjectOutput out) throws IOException {
			out.writeUTF((this.prefix != null) ? this.prefix : "");
			out.writeUTF(this.localName);
			out.writeUTF(this.m.getDeclaringClass().getName());
			out.writeUTF(this.m.getName());
			out.writeObject(ReflectionUtil.toTypeNameArray(this.m
					.getParameterTypes()));
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see java.io.Externalizable#readExternal(java.io.ObjectInput)
		 */
		public void readExternal(ObjectInput in) throws IOException,
				ClassNotFoundException {

			this.prefix = in.readUTF();
			if ("".equals(this.prefix))
				this.prefix = null;
			this.localName = in.readUTF();
			this.owner = in.readUTF();
			this.name = in.readUTF();
			this.types = (String[]) in.readObject();
		}

		public Method getMethod() {
			if (this.m == null) {
				try {
					Class t = ReflectionUtil.forName(this.owner);
					Class[] p = ReflectionUtil.toTypeArray(this.types);
					this.m = t.getMethod(this.name, p);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
			return this.m;
		}

		public boolean matches(String prefix, String localName) {
			if (this.prefix != null) {
				if (prefix == null)
					return false;
				if (!this.prefix.equals(prefix))
					return false;
			}
			return this.localName.equals(localName);
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see java.lang.Object#equals(java.lang.Object)
		 */
		public boolean equals(Object obj) {
			if (obj instanceof Function) {
				return this.hashCode() == obj.hashCode();
			}
			return false;
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see java.lang.Object#hashCode()
		 */
		public int hashCode() {
			return (this.prefix + this.localName).hashCode();
		}

		public String toString() {
			StringBuffer sb = new StringBuffer(32);
			sb.append("Function[");
			if (this.prefix != null) {
				sb.append(this.prefix).append(':');
			}
			sb.append(this.name).append("] ");
			sb.append(this.m);
			return sb.toString();
		}
	}
}