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 /*
  * Copyright (C) 2005 The Guava Authors
  *
  * 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.google.common.reflect;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
Static utilities relating to Java reflection.

Since:
12.0
public final class Reflection {

  
Returns the package name of clazz according to the Java Language Specification (section 6.7). Unlike java.lang.Class.getPackage(), this method only parses the class name, without attempting to define the java.lang.Package and hence load files.
  public static String getPackageName(Class<?> clazz) {
    return getPackageName(clazz.getName());
  }

  
Returns the package name of classFullName according to the Java Language Specification (section 6.7). Unlike java.lang.Class.getPackage(), this method only parses the class name, without attempting to define the java.lang.Package and hence load files.
  public static String getPackageName(String classFullName) {
    int lastDot = classFullName.lastIndexOf('.');
    return (lastDot < 0) ? "" : classFullName.substring(0, lastDot);
  }

  
Ensures that the given classes are initialized, as described in JLS Section 12.4.2.

WARNING: Normally it's a smell if a class needs to be explicitly initialized, because static state hurts system maintainability and testability. In cases when you have no choice while inter-operating with a legacy framework, this method helps to keep the code less ugly.

Throws:
java.lang.ExceptionInInitializerError if an exception is thrown during initialization of a class
  public static void initialize(Class<?>... classes) {
    for (Class<?> clazz : classes) {
      try {
        Class.forName(clazz.getName(), trueclazz.getClassLoader());
      } catch (ClassNotFoundException e) {
        throw new AssertionError(e);
      }
    }
  }

  
Returns a proxy instance that implements interfaceType by dispatching method invocations to handler. The class loader of interfaceType will be used to define the proxy class. To implement multiple interfaces or specify a class loader, use java.lang.reflect.Proxy.newProxyInstance(java.lang.ClassLoader,java.lang.Class[],java.lang.reflect.InvocationHandler).

Throws:
java.lang.IllegalArgumentException if interfaceType does not specify the type of a Java interface
  public static <T> T newProxy(
      Class<T> interfaceTypeInvocationHandler handler) {
    checkNotNull(handler);
    checkArgument(interfaceType.isInterface(), "%s is not an interface"interfaceType);
    Object object = Proxy.newProxyInstance(
        interfaceType.getClassLoader(),
        new Class<?>[] { interfaceType },
        handler);
    return interfaceType.cast(object);
  }
  private Reflection() {}
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