Commons Modeler example source code file (ModelerSource.java)

This example Commons Modeler source code file (ModelerSource.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 - Commons Modeler tags/keywords

file, fileinputstream, fileinputstream, inputstream, inputstream, io, ioexception, list, management, modelersource, net, network, object, object, objectname, string, string, url, util

The Commons Modeler ModelerSource.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.commons.modeler.modules;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.List;

import javax.management.ObjectName;

import org.apache.commons.modeler.Registry;

/** Source for descriptor data. More sources can be added.
 *
 */
public class ModelerSource {
    protected Object source;
    protected String location;

    /** Load data, returns a list of items. 
     * 
     * @param registry
     * @param location
     * @param type
     * @param source Introspected object or some other source
     * @throws Exception
     */ 
    public List loadDescriptors( Registry registry, String location,
                                 String type, Object source)
            throws Exception
    {
        // TODO
        return null;
    }
    
    /** Callback from the BaseMBean to notify that an attribute has changed.
     * Can be used to implement persistence.
     * 
     * @param oname
     * @param name
     * @param value
     */ 
    public void updateField( ObjectName oname, String name, 
                             Object value ) {
        // nothing by default 
    }

    public void store() {
        // nothing
    }

    protected InputStream getInputStream() throws IOException {
        if( source instanceof URL ) {
            URL url=(URL)source;
            location=url.toString();
            return url.openStream();
        } else if( source instanceof File ) {
            location=((File)source).getAbsolutePath();
            return new FileInputStream((File)source);            
        } else if( source instanceof String) {
            location=(String)source;
            return new FileInputStream((String)source);            
        } else if( source instanceof InputStream ) {
            return (InputStream)source;
        } 
        return null;
    }

}