| /* |
| * 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.jena.sparql.pfunction; |
| import java.util.* ; |
| |
| import org.apache.jena.atlas.logging.Log ; |
| import org.apache.jena.query.ARQ ; |
| import org.apache.jena.sparql.ARQConstants ; |
| import org.apache.jena.sparql.util.Context ; |
| import org.apache.jena.sparql.util.MappedLoader ; |
| |
| |
| public class PropertyFunctionRegistry |
| { |
| static PropertyFunctionRegistry globalRegistry = null ; |
| |
| Map<String, PropertyFunctionFactory> registry = new HashMap<>() ; |
| Set<String> attemptedLoads = new HashSet<>() ; |
| |
| public static PropertyFunctionRegistry standardRegistry() |
| { |
| PropertyFunctionRegistry reg = get(ARQ.getContext()) ; |
| return reg ; |
| } |
| |
| public static void init() { |
| // Intialize if there is no registry already set |
| PropertyFunctionRegistry reg = new PropertyFunctionRegistry() ; |
| StandardPropertyFunctions.loadStdDefs(reg) ; |
| set(ARQ.getContext(), reg) ; |
| } |
| |
| public static PropertyFunctionRegistry get(Context context) |
| { |
| if ( context == null ) |
| return null ; |
| return (PropertyFunctionRegistry)context.get(ARQConstants.registryPropertyFunctions) ; |
| } |
| |
| /** Get the PropertyFunctionRegistry, defaulting to the global one */ |
| public static PropertyFunctionRegistry chooseRegistry(Context context) |
| { |
| PropertyFunctionRegistry registry = PropertyFunctionRegistry.get(context) ; |
| // Else global |
| if ( registry == null ) |
| registry = PropertyFunctionRegistry.get() ; |
| return registry ; |
| } |
| |
| public static void set(Context context, PropertyFunctionRegistry reg) |
| { context.set(ARQConstants.registryPropertyFunctions, reg) ; } |
| |
| public synchronized static PropertyFunctionRegistry get() |
| { |
| // Intialize if there is no registry already set |
| PropertyFunctionRegistry reg = get(ARQ.getContext()) ; |
| if ( reg == null ) |
| { |
| reg = standardRegistry() ; |
| set(ARQ.getContext(), reg) ; |
| } |
| return reg ; |
| } |
| |
| |
| /** Insert an PropertyFunction class. |
| * Re-inserting with the same URI overwrites the old entry. |
| * New instance created on retrieval (auto-factory) |
| * |
| * @param uri String URI for the PropertyFunction |
| * @param extClass The Java class |
| */ |
| public void put(String uri, Class<?> extClass) |
| { |
| if ( ! PropertyFunction.class.isAssignableFrom(extClass) ) |
| { |
| Log.warn(this, "Class "+extClass.getName()+" is not an PropertyFunction" ); |
| return ; |
| } |
| |
| put(uri,new PropertyFunctionFactoryAuto(extClass)) ; |
| } |
| |
| /** Insert an PropertyFunction factory. Re-inserting with the same URI |
| * overwrites the old entry. |
| * |
| * @param uri String URI for the PropertyFunction |
| * @param factory Factory to make PropertyFunction instances |
| */ |
| public void put(String uri, PropertyFunctionFactory factory) { registry.put(uri,factory) ; } |
| |
| public boolean manages(String uri) |
| { |
| if ( registry.containsKey(uri) ) |
| return true ; |
| if ( MappedLoader.isPossibleDynamicURI(uri, PropertyFunction.class) ) |
| return true ; |
| return false ; |
| } |
| |
| /** Lookup by URI */ |
| public PropertyFunctionFactory get(String uri) |
| { |
| // Is it mapped? |
| String mappedUri = MappedLoader.mapDynamicURI(uri) ; |
| if ( mappedUri != null ) |
| uri = mappedUri ; |
| |
| // Plain registration, after mapping. |
| PropertyFunctionFactory factory = registry.get(uri) ; |
| if ( factory != null ) |
| return factory; |
| |
| if ( attemptedLoads.contains(uri) ) |
| return null ; |
| |
| Class<?> extClass = MappedLoader.loadClass(uri, PropertyFunction.class) ; |
| if ( extClass == null ) |
| return null ; |
| // Register it |
| put(mappedUri, extClass) ; |
| attemptedLoads.add(uri) ; |
| // Call again to get it. |
| return registry.get(uri) ; |
| } |
| |
| public boolean isRegistered(String uri) { return registry.containsKey(uri) ; } |
| |
| /** Remove by URI */ |
| public PropertyFunctionFactory remove(String uri) { return registry.remove(uri) ; } |
| |
| /** Iterate over URIs */ |
| public Iterator<String> keys() { return registry.keySet().iterator() ; } |
| } |