content: /*
   * Copyright (C) 2011 The Android Open Source Project
   *
   * 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.hx.curtain.drawer.nineoldandroids.util;
  
  
  /**
   * A property is an abstraction that can be used to represent a <emb>mutable</em> value that is held
   * in a <em>host</em> object. The Property's {@link #set(Object, Object)} or {@link #get(Object)}
   * methods can be implemented in terms of the private fields of the host object, or via "setter" and
   * "getter" methods or by some other mechanism, as appropriate.
   *
   * @param <T> The class on which the property is declared.
   * @param <V> The type that this property represents.
   */
  public abstract class Property<T, V> {
  
      private final String mName;
      private final Class<V> mType;
  
      /**
       * This factory method creates and returns a Property given the <code>class</code> and
       * <code>name</code> parameters, where the <code>"name"</code> parameter represents either:
       * <ul>
       *     <li>a public <code>getName()</code> method on the class which takes no arguments, plus an
       *     optional public <code>setName()</code> method which takes a value of the same type
       *     returned by <code>getName()</code>
       *     <li>a public <code>isName()</code> method on the class which takes no arguments, plus an
       *     optional public <code>setName()</code> method which takes a value of the same type
       *     returned by <code>isName()</code>
       *     <li>a public <code>name</code> field on the class
       * </ul>
       *
       * <p>If either of the get/is method alternatives is found on the class, but an appropriate
       * <code>setName()</code> method is not found, the <code>Property</code> will be
       * {@link #isReadOnly() readOnly}. Calling the {@link #set(Object, Object)} method on such
       * a property is allowed, but will have no effect.</p>
       *
       * <p>If neither the methods nor the field are found on the class a
       * {@link NoSuchPropertyException} exception will be thrown.</p>
       */
      public static <T, V> Property<T, V> of(Class<T> hostType, Class<V> valueType, String name) {
          return new ReflectiveProperty<T, V>(hostType, valueType, name);
      }
  
      /**
       * A constructor that takes an identifying name and {@link #getType() type} for the property.
       */
      public Property(Class<V> type, String name) {
          mName = name;
          mType = type;
      }
  
      /**
       * Returns true if the {@link #set(Object, Object)} method does not set the value on the target
       * object (in which case the {@link #set(Object, Object) set()} method should throw a {@link
       * NoSuchPropertyException} exception). This may happen if the Property wraps functionality that
       * allows querying the underlying value but not setting it. For example, the {@link #of(Class,
       * Class, String)} factory method may return a Property with name "foo" for an object that has
       * only a <code>getFoo()</code> or <code>isFoo()</code> method, but no matching
       * <code>setFoo()</code> method.
       */
      public boolean isReadOnly() {
          return false;
      }
  
      /**
       * Sets the value on <code>object</code> which this property represents. If the method is unable
       * to set the value on the target object it will throw an {@link UnsupportedOperationException}
       * exception.
       */
      public void set(T object, V value) {
          throw new UnsupportedOperationException("Property " + getName() +" is read-only");
      }
  
      /**
       * Returns the current value that this property represents on the given <code>object</code>.
       */
      public abstract V get(T object);
  
      /**
       * Returns the name for this property.
       */
      public String getName() {
          return mName;
      }
  
      /**
       * Returns the type for this property.
       */
      public Class<V> getType() {
          return mType;
      }
  }
  