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Tomcat example source code file (FunctionMapperImpl.java)

This example Tomcat source code file (FunctionMapperImpl.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 - Tomcat tags/keywords

class, classnotfoundexception, externalizable, function, function, functionmapper, io, ioexception, ioexception, map, method, method, nullpointerexception, reflection, string, string, util

The Tomcat FunctionMapperImpl.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.el.lang;

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.Map;

import javax.el.FunctionMapper;

import org.apache.el.util.ReflectionUtil;


/**
 * @author Jacob Hookom [jacob@hookom.net]
 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: funkman $
 */
public class FunctionMapperImpl extends FunctionMapper implements
        Externalizable {

    private static final long serialVersionUID = 1L;
    
    protected 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 static class Function implements Externalizable {
    
        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.owner != null) ? 
                     this.owner : 
                     this.m.getDeclaringClass().getName());
            out.writeUTF((this.name != null) ? 
                     this.name : 
                     this.m.getName());
            out.writeObject((this.types != null) ? 
                     this.types : 
                     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();
        }
    }

}

Other Tomcat examples (source code examples)

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