content: /*
   * Created on Jan 25, 2009
   * 
   * 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.
   * 
   * Copyright @2009-2013 the original author or authors.
   */
  package org.fest.reflect.innerclass;
  
  import org.fest.reflect.exception.ReflectionError;
  
  import org.jetbrains.annotations.NotNull;
  
  import static org.fest.util.Preconditions.checkNotNull;
  import static org.fest.util.Preconditions.checkNotNullOrEmpty;
  import static org.fest.util.Strings.concat;
  
  /**
   * Obtains a reference to a static inner class.
   *
   * @author Alex Ruiz
   * @since 1.1
   */
  public class InnerClassFinder {
    private final Class<?> declaringClass;
    private final String innerClassName;
  
    InnerClassFinder(@NotNull Class<?> declaringClass, @NotNull String innerClassName) {
      this.declaringClass = checkNotNull(declaringClass);
      this.innerClassName = checkNotNullOrEmpty(innerClassName);
    }
  
    /**
     * Returns a reference to the static inner class specified in the fluent interface.
     * <p/>
     * Assuming we have the top-level class {@code Jedi} containing the static inner classes: {@code Master} and
     * {@code Padawan}:
     * <pre>
     * public class Jedi {
     *   public static class Master {}
     *
     *   public static class Padawan {}
     * }
     * </pre>
     * <p/>
     * The following example shows how to get a reference to the inner class {@code Master}:
     * <pre>
     * // import static {@link org.fest.reflect.core.Reflection#innerClass(String) org.fest.reflect.core.Reflection.innerClass};
     *
     * Class&lt;?&gt; masterClass = {@link org.fest.reflect.core.Reflection#innerClass(String) innerClass}("Master").{@link org.fest.reflect.innerclass.InnerClassName#in(Class) in}(Jedi.class).{@link org.fest.reflect.innerclass.InnerClassFinder#get() get}();
     * </pre>
     *
     * @return a reference to the static inner class specified in the fluent interface.
     * @throws ReflectionError if the static inner class does not exist (since 1.2).
     */
    public @NotNull Class<?> get() {
      String namespace = declaringClass.getName();
      String expectedInnerClassName = expectedInnerClassName(namespace);
      for (Class<?> innerClass : declaringClass.getDeclaredClasses()) {
        if (innerClass.getName().equals(expectedInnerClassName)) {
          return innerClass;
        }
      }
      String format = "Failed to find static inner class %s in %s";
      throw new ReflectionError(String.format(format, innerClassName, declaringClass.getName()));
    }
  
    private String expectedInnerClassName(String namespace) {
      return concat(namespace, "$", innerClassName);
    }
  }
  