content: /*
   * Created on Nov 23, 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.beanproperty;
  
  import org.fest.reflect.exception.ReflectionError;
  
  import org.jetbrains.annotations.NotNull;
  import org.jetbrains.annotations.Nullable;
  import java.beans.BeanInfo;
  import java.beans.Introspector;
  import java.beans.PropertyDescriptor;
  
  import static org.fest.reflect.util.Types.castSafely;
  import static org.fest.util.Preconditions.checkNotNull;
  import static org.fest.util.Preconditions.checkNotNullOrEmpty;
  
  /**
   * Accesses a
   * <a href="http://docs.oracle.com/javase/tutorial/javabeans/index.html" target="_blank">JavaBeans</a> property via Bean
   * Introspection.
   *
   * @param <T> the type for the property to access.
   * @author Alex Ruiz
   * @since 1.2
   */
  public final class PropertyAccessor<T> {
    private final Class<T> propertyType;
    private final Object target;
    private final PropertyDescriptor descriptor;
  
    PropertyAccessor(@NotNull String propertyName, @NotNull Class<T> propertyType, @NotNull Object target) {
      this.propertyType = checkNotNull(propertyType);
      this.target = checkNotNull(target);
      this.descriptor = findPropertyDescriptor(checkNotNullOrEmpty(propertyName));
    }
  
    private PropertyDescriptor findPropertyDescriptor(@NotNull String propertyName) {
      BeanInfo beanInfo;
      Class<?> targetType = target.getClass();
      try {
        beanInfo = Introspector.getBeanInfo(targetType);
      } catch (Throwable t) {
        String format = "Failed to get BeanInfo for type %s";
        throw new ReflectionError(String.format(format, targetType.getName()), t);
      }
      PropertyDescriptor found = null;
      for (PropertyDescriptor descriptor : beanInfo.getPropertyDescriptors()) {
        if (propertyName.equals(descriptor.getName())) {
          found = descriptor;
          break;
        }
      }
      if (found != null) {
        Class<?> actualType = found.getPropertyType();
        if (!propertyType.isAssignableFrom(actualType)) {
          String format = "Expecting type of property '%s' in %s to be <%s> but was <%s>";
          String msg =
              String.format(format, propertyName, targetType.getName(), propertyType.getName(), actualType.getName());
          throw new ReflectionError(msg);
        }
        return found;
      }
      String msg = String.format("Failed to find property '%s' in %s", propertyName, targetType.getName());
      throw new ReflectionError(msg);
    }
  
    /**
     * Sets a value of the
     * <a href="http://docs.oracle.com/javase/tutorial/javabeans/index.html" target="_blank">JavaBeans</a> property.
     * <p/>
     * Examples:
     * <pre>
     * // import static {@link org.fest.reflect.core.Reflection#property(String) org.fest.reflect.core.Reflection.property};
     *
     * // Equivalent to "String name = person.getName()"
     * String name = {@link org.fest.reflect.core.Reflection#property(String) property}("name").{@link org.fest.reflect.beanproperty.PropertyName#ofType(Class) ofType}(String.class).{@link org.fest.reflect.beanproperty.PropertyType#in(Object) in}(person).{@link org.fest.reflect.beanproperty.PropertyAccessor#get() get}();
     *
     * // Equivalent to "person.setName("Yoda")"
     * {@link org.fest.reflect.core.Reflection#property(String) property}("name").{@link org.fest.reflect.beanproperty.PropertyName#ofType(Class) ofType}(String.class).{@link org.fest.reflect.beanproperty.PropertyType#in(Object) in}(person).{@link org.fest.reflect.beanproperty.PropertyAccessor#set(Object) set}("Yoda");
     *
     * // Equivalent to "List&lt;String&gt; powers = jedi.getPowers()"
     * List&lt;String&gt; powers = {@link org.fest.reflect.core.Reflection#property(String) property}("powers").{@link org.fest.reflect.beanproperty.PropertyName#ofType(org.fest.reflect.reference.TypeRef) ofType}(new {@link org.fest.reflect.reference.TypeRef TypeRef}&lt;List&lt;String&gt;&gt;() {}).{@link org.fest.reflect.beanproperty.PropertyTypeRef#in(Object) in}(jedi).{@link org.fest.reflect.beanproperty.PropertyAccessor#get() get}();
     *
     * // Equivalent to "jedi.setPowers(powers)"
     * List&lt;String&gt; powers = new ArrayList&lt;String&gt;();
     * powers.add("heal");
     * {@link org.fest.reflect.core.Reflection#property(String) property}("powers").{@link org.fest.reflect.beanproperty.PropertyName#ofType(org.fest.reflect.reference.TypeRef) ofType}(new {@link org.fest.reflect.reference.TypeRef TypeRef}&lt;List&lt;String&gt;&gt;() {}).{@link org.fest.reflect.beanproperty.PropertyTypeRef#in(Object) in}(jedi).{@link org.fest.reflect.beanproperty.PropertyAccessor#set(Object) set}(powers);
     * </pre>
     *
     * @param value the value to set.
     * @throws ReflectionError if the given value cannot be set.
     */
    public void set(@Nullable T value) {
      try {
        descriptor.getWriteMethod().invoke(target, value);
      } catch (Exception e) {
        String format = "Failed to set value %s in property '%s'";
        String msg = String.format(format, String.valueOf(value), descriptor.getName());
        throw new ReflectionError(msg, e);
      }
    }
  
    /**
     * Retrieves the value of the
     * <a href="http://docs.oracle.com/javase/tutorial/javabeans/index.html" target="_blank">JavaBeans</a> property.
     * <p/>
     * Examples:
     * <pre>
     * // import static {@link org.fest.reflect.core.Reflection#property(String) org.fest.reflect.core.Reflection.property};
     *
     * // Equivalent to "String name = person.getName()"
     * String name = {@link org.fest.reflect.core.Reflection#property(String) property}("name").{@link org.fest.reflect.beanproperty.PropertyName#ofType(Class) ofType}(String.class).{@link org.fest.reflect.beanproperty.PropertyType#in(Object) in}(person).{@link org.fest.reflect.beanproperty.PropertyAccessor#get() get}();
     *
     * // Equivalent to "person.setName("Yoda")"
     * {@link org.fest.reflect.core.Reflection#property(String) property}("name").{@link org.fest.reflect.beanproperty.PropertyName#ofType(Class) ofType}(String.class).{@link org.fest.reflect.beanproperty.PropertyType#in(Object) in}(person).{@link org.fest.reflect.beanproperty.PropertyAccessor#set(Object) set}("Yoda");
     *
     * // Equivalent to "List&lt;String&gt; powers = jedi.getPowers()"
     * List&lt;String&gt; powers = {@link org.fest.reflect.core.Reflection#property(String) property}("powers").{@link org.fest.reflect.beanproperty.PropertyName#ofType(org.fest.reflect.reference.TypeRef) ofType}(new {@link org.fest.reflect.reference.TypeRef TypeRef}&lt;List&lt;String&gt;&gt;() {}).{@link org.fest.reflect.beanproperty.PropertyTypeRef#in(Object) in}(jedi).{@link org.fest.reflect.beanproperty.PropertyAccessor#get() get}();
     *
     * // Equivalent to "jedi.setPowers(powers)"
     * List&lt;String&gt; powers = new ArrayList&lt;String&gt;();
     * powers.add("heal");
     * {@link org.fest.reflect.core.Reflection#property(String) property}("powers").{@link org.fest.reflect.beanproperty.PropertyName#ofType(org.fest.reflect.reference.TypeRef) ofType}(new {@link org.fest.reflect.reference.TypeRef TypeRef}&lt;List&lt;String&gt;&gt;() {}).{@link org.fest.reflect.beanproperty.PropertyTypeRef#in(Object) in}(jedi).{@link org.fest.reflect.beanproperty.PropertyAccessor#set(Object) set}(powers);
     * </pre>
     *
     * @return the value of the JavaBeans property in this fluent interface.
     * @throws ReflectionError if the value of the property cannot be retrieved.
     */
    public @Nullable T get() {
      try {
        Object value = descriptor.getReadMethod().invoke(target);
        return castSafely(value, propertyType);
      } catch (Throwable t) {
        String msg = String.format("Failed to get the value of property '%s'", descriptor.getName());
        throw new ReflectionError(msg, t);
      }
    }
  
    /**
     * @return the underlying
     *         <a href="http://docs.oracle.com/javase/tutorial/javabeans/index.html" target="_blank">JavaBeans</a>
     *         property to invoke via Bean Introspection.
     */
    public @NotNull PropertyDescriptor target() {
      return descriptor;
    }
  }
  