001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.modeler.modules; 018 019 import java.io.File; 020 import java.io.FileInputStream; 021 import java.io.IOException; 022 import java.io.InputStream; 023 import java.net.URL; 024 import java.util.List; 025 026 import javax.management.ObjectName; 027 028 import org.apache.commons.modeler.Registry; 029 030 /** Source for descriptor data. More sources can be added. 031 * 032 */ 033 public class ModelerSource { 034 protected Object source; 035 protected String location; 036 037 /** Load data, returns a list of items. 038 * 039 * @param registry 040 * @param location 041 * @param type 042 * @param source Introspected object or some other source 043 * @throws Exception 044 */ 045 public List loadDescriptors( Registry registry, String location, 046 String type, Object source) 047 throws Exception 048 { 049 // TODO 050 return null; 051 } 052 053 /** Callback from the BaseMBean to notify that an attribute has changed. 054 * Can be used to implement persistence. 055 * 056 * @param oname 057 * @param name 058 * @param value 059 */ 060 public void updateField( ObjectName oname, String name, 061 Object value ) { 062 // nothing by default 063 } 064 065 public void store() { 066 // nothing 067 } 068 069 protected InputStream getInputStream() throws IOException { 070 if( source instanceof URL ) { 071 URL url=(URL)source; 072 location=url.toString(); 073 return url.openStream(); 074 } else if( source instanceof File ) { 075 location=((File)source).getAbsolutePath(); 076 return new FileInputStream((File)source); 077 } else if( source instanceof String) { 078 location=(String)source; 079 return new FileInputStream((String)source); 080 } else if( source instanceof InputStream ) { 081 return (InputStream)source; 082 } 083 return null; 084 } 085 086 }