| /******************************************************************************* |
| * 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.ofbiz.minilang.method.conditional; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.ServiceLoader; |
| |
| import org.ofbiz.base.util.Debug; |
| import org.ofbiz.base.util.UtilGenerics; |
| import org.ofbiz.minilang.MiniLangException; |
| import org.ofbiz.minilang.SimpleMethod; |
| import org.w3c.dom.Element; |
| |
| /** |
| * An abstract factory class for creating <if> element sub-element implementations. |
| * <p>Mini-language can be extended to support additional condition elements |
| * by extending this class to provide custom conditional element implementations. |
| * </p> |
| */ |
| public abstract class ConditionalFactory<C extends Conditional> { |
| |
| public static final String module = ConditionalFactory.class.getName(); |
| private static final Map<String, ConditionalFactory<?>> conditionalFactories; |
| |
| static { |
| Map<String, ConditionalFactory<?>> factories = new HashMap<String, ConditionalFactory<?>>(); |
| Iterator<ConditionalFactory<?>> it = UtilGenerics.cast(ServiceLoader.load(ConditionalFactory.class, ConditionalFactory.class.getClassLoader()).iterator()); |
| while (it.hasNext()) { |
| ConditionalFactory<?> factory = it.next(); |
| factories.put(factory.getName(), factory); |
| } |
| conditionalFactories = Collections.unmodifiableMap(factories); |
| } |
| |
| public static Conditional makeConditional(Element element, SimpleMethod simpleMethod) throws MiniLangException { |
| String tagName = element.getTagName(); |
| ConditionalFactory<?> factory = conditionalFactories.get(tagName); |
| if (factory != null) { |
| return factory.createCondition(element, simpleMethod); |
| } else { |
| Debug.logWarning("Found an unknown if condition: " + tagName, module); |
| return null; |
| } |
| } |
| |
| public abstract C createCondition(Element element, SimpleMethod simpleMethod) throws MiniLangException; |
| |
| public abstract String getName(); |
| } |