xml/dom-impl/src/com/intellij/util/xml/reflect/DomExtenderEP.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.util.xml.reflect;
  17
  18 import com.intellij.openapi.diagnostic.Logger;
  19 import com.intellij.openapi.extensions.AbstractExtensionPointBean;
  20 import com.intellij.openapi.extensions.ExtensionPointName;
  21 import com.intellij.openapi.project.Project;
  22 import com.intellij.util.xml.DomElement;
  23 import com.intellij.util.xmlb.annotations.Attribute;
  24 import org.jetbrains.annotations.NotNull;
  25 import org.jetbrains.annotations.Nullable;
  26
  27 /**
  28  * @author peter
  29  */
  30 public class DomExtenderEP extends AbstractExtensionPointBean {
  31   private static final Logger LOG = Logger.getInstance("#com.intellij.util.xml.reflect.DomExtenderEP");
  32   public static final ExtensionPointName<DomExtenderEP> EP_NAME = ExtensionPointName.create("com.intellij.dom.extender");
  33
  34   @Attribute("domClass")
  35   public String domClassName;
  36   @Attribute("extenderClass")
  37   public String extenderClassName;
  38
  39   private Class<?> myDomClass;
  40   private DomExtender myExtender;
  41
  42
  43   @Nullable
  44   public DomExtensionsRegistrarImpl extend(@NotNull final Project project, @NotNull final DomElement element, @Nullable DomExtensionsRegistrarImpl registrar) {
  45     if (myExtender == null) {
  46       try {
  47         myDomClass = findClass(domClassName);
  48         myExtender = instantiate(extenderClassName, project.getPicoContainer());
  49       }
  50       catch(Exception e) {
  51         LOG.error(e);
  52         return null;
  53       }
  54     }
  55     if (myDomClass.isInstance(element)) {
  56       if (registrar == null) {
  57         registrar = new DomExtensionsRegistrarImpl();
  58       }
  59       myExtender.registerExtensions(element, registrar);
  60     }
  61     return registrar;
  62   }
  63
  64 }