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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.chain.web.javax;
18  
19  import java.util.Locale;
20  import java.util.function.BiConsumer;
21  
22  import org.apache.commons.chain.Command;
23  import org.apache.commons.chain.Context;
24  
25  /**
26   * Base {@link Command} implementation for setting the
27   * response locale for this response to the {@code Locale} stored
28   * under the context attribute key returned by the {@code localeKey}
29   * property.
30   *
31   * @param <C> Type of the context associated with this command
32   *
33   * @author Stefan Graff
34   * @since Chain 1.3
35   */
36  public abstract class SetLocaleCommand<C extends WebContext> implements Command<C> {
37  
38      // ----------------------------------------------------- Instance Variables
39  
40      /**
41       * BiConsumer to set the {@link Locale} into the {@code context}.
42       */
43      private final BiConsumer<C, Locale> localeBiConsumer;
44  
45      // ----------------------------------------------------------- Constructors
46  
47      /**
48       * Construct a new instance to set the locale into the context.
49       *
50       * @param localeBiConsumer BiConsumer to set the {@link Locale} into
51       *                         the {@code context}
52       */
53      public SetLocaleCommand(final BiConsumer<C, Locale> localeBiConsumer) {
54          this.localeBiConsumer = localeBiConsumer;
55      }
56  
57      // -------------------------------------------------------------- Properties
58  
59      /**
60       * The context attribute key used to retrieve the {@code Locale}.
61       */
62      private String localeKey = "locale";
63  
64      /**
65       * Return the context attribute key under which we will retrieve
66       * the response {@code Locale}.
67       *
68       * @return The context attribute key of the request {@code Locale}.
69       */
70      public String getLocaleKey() {
71          return this.localeKey;
72      }
73  
74      /**
75       * Set the context attribute key under which we will retrieve
76       * the response {@code Locale}.
77       *
78       * @param localeKey The new context attribute key
79       */
80      public void setLocaleKey(String localeKey) {
81          this.localeKey = localeKey;
82      }
83  
84      // --------------------------------------------------------- Command Methods
85  
86      /**
87       * Retrieve the {@code Locale} stored under the specified
88       * context attribute key, and establish it on this response.
89       *
90       * @param context The {@link Context} we are operating on
91       *
92       * @return {@code false} so that processing will continue
93       *
94       * @throws Exception If an error occurs during execution.
95       */
96      @Override
97      public boolean execute(C context) throws Exception {
98          localeBiConsumer.accept(context, (Locale) context.get(getLocaleKey()));
99          return false;
100     }
101 }