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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.beanutils.converters;
18  
19  import org.apache.commons.beanutils.Converter;
20  
21  /**
22   * Provides a facade for {@link Converter} implementations
23   * preventing access to any public API in the implementation,
24   * other than that specified by {@link Converter}.
25   * <p />
26   * This implementation can be used to prevent registered {@link Converter}
27   * implementations that provide configuration options from being
28   * retrieved and modified.
29   *
30   * @version $Id$
31   * @since 1.8.0
32   */
33  public final class ConverterFacade implements Converter {
34  
35      private final Converter converter;
36  
37      /**
38       * Construct a converter which delegates to the specified
39       * {@link Converter} implementation.
40       *
41       * @param converter The converter to delegate to
42       */
43      public ConverterFacade(final Converter converter) {
44          if (converter == null) {
45              throw new IllegalArgumentException("Converter is missing");
46          }
47          this.converter = converter;
48      }
49  
50      /**
51       * Convert the input object into an output object of the
52       * specified type by delegating to the underlying {@link Converter}
53       * implementation.
54       *
55       * @param <T> The result type of the conversion
56       * @param type Data type to which this value should be converted
57       * @param value The input value to be converted
58       * @return The converted value.
59       */
60      public <T> T convert(final Class<T> type, final Object value) {
61          return converter.convert(type, value);
62      }
63  
64      /**
65       * Provide a String representation of this facade implementation
66       * sand the underlying {@link Converter} it delegates to.
67       *
68       * @return A String representation of this facade implementation
69       * sand the underlying {@link Converter} it delegates to
70       */
71      @Override
72      public String toString() {
73          return "ConverterFacade[" + converter.toString() + "]";
74      }
75  
76  }