content: /*
   * Copyright (C) 2010-2101 Alibaba Group Holding Limited.
   *
   * Licensed 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 com.alibaba.otter.shared.common.utils.compile.model;
  
  import java.io.ByteArrayInputStream;
  import java.io.InputStream;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.tools.JavaFileObject;
  
  public final class JdkCompilerClassLoader extends ClassLoader {
  
      private final Map<String, JavaFileObject> classes = new HashMap<String, JavaFileObject>();
  
      public JdkCompilerClassLoader(ClassLoader parentClassLoader){
          super(parentClassLoader);
      }
  
      public Collection<JavaFileObject> files() {
          return Collections.unmodifiableCollection(classes.values());
      }
  
      public void clearCache() {
          this.classes.clear();
      }
  
      public JavaFileObject getJavaFileObject(String qualifiedClassName) {
          return classes.get(qualifiedClassName);
      }
  
      protected synchronized Class<?> findClass(String qualifiedClassName) throws ClassNotFoundException {
          JavaFileObject file = classes.get(qualifiedClassName);
          if (file != null) {
              byte[] bytes = ((JavaFileObjectImpl) file).getByteCode();
              return defineClass(qualifiedClassName, bytes, 0, bytes.length);
          }
  
          try {
              return Class.forName(qualifiedClassName);
          } catch (ClassNotFoundException nf) {
              // Ignore and fall through
          }
  
          try {
              return Thread.currentThread().getContextClassLoader().loadClass(qualifiedClassName);
          } catch (ClassNotFoundException nf) {
              // Ignore and fall through
          }
  
          return super.findClass(qualifiedClassName);
      }
  
      public void add(String qualifiedClassName, final JavaFileObject javaFile) {
          classes.put(qualifiedClassName, javaFile);
      }
  
      protected synchronized Class<?> loadClass(final String name, final boolean resolve) throws ClassNotFoundException {
          try {
              Class c = findClass(name);
              if (c != null) {
                  if (resolve) {
                      resolveClass(c);
                  }
  
                  return c;
              }
          } catch (ClassNotFoundException e) {
              // Ignore and fall through
          }
  
          return super.loadClass(name, resolve);
      }
  
      public InputStream getResourceAsStream(final String name) {
          if (name.endsWith(".class")) {
              String qualifiedClassName = name.substring(0, name.length() - ".class".length()).replace('/', '.');
              JavaFileObjectImpl file = (JavaFileObjectImpl) classes.get(qualifiedClassName);
  
              if (file != null) {
                  return new ByteArrayInputStream(file.getByteCode());
              }
          }
  
          return super.getResourceAsStream(name);
      }
  
  }
  