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Amazon.com local client be instantiated without having a valid configuration. The use of passing configuration items by using the constructor would apply to the Google search engine client and any other local client. To wire the local clients to the controller, another method that implements the Builder pattern is used. An example of implementing the Builder pattern for the local clients is as follows: public class SearchBuilder { private static String _amazonEndPoint; private static String _googleEndPoint; private static String _amazonAccessKey; private static String _amazonSecretKey; private static String _googleAccessKey; private static boolean _didAssign = false; public static void assignConfiguration( String amazon, String amazonAccessKey, String amazonSecretKey, String google, String googleAccessKey) { _amazonEndPoint = amazon; _amazonAccessKey = amazonAccessKey; _amazonSecretKey = amazonSecretKey; _googleEndPoint = google; _googleAccessKey = googleAccessKey; if( _amazonEndPoint == null || _amazonEndPoint.length() == 0 || _googleEndPoint == null || _googleEndPoint.length() == 0 || _amazonAccessKey == null || _amazonAccessKey.length() == 0 || _amazonSecretKey == null || _amazonAccessKey.length() == 0 || _googleAccessKey == null || _googleAccessKey.length() == 0) { throw new IllegalStateException( "configuration data invalid"); } _didAssign = true; } public static void buildCommands( Parent parent) { if( ! _didAssign) { throw new IllegalStateException( "configuration data not assigned"); } parent.clearAllCommands(); parent.addCommand( new AmazonSearchCommand( _amazonEndPoint, _amazonAccessKey, _amazonSecretKey)); parent.addCommand( new GoogleSearchCommand( _googleEndPoint, _googleAccessKey)); } } The class SearchBuilder has two static methods: assignConfiguration and buildCommands. The method assignConfiguration assigns the default configuration to the Amazon.com or Google local clients when the local clients are instantiated. In the example, the configuration values are referenced as simple strings, but those strings could have been converted into types, and the method assignConfiguration could have referenced those types. Converting the strings would probably have been a good idea because five parameters can become a bit
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tedious to maintain. Shown only with a basic amount of code is the validation of the data in the assignConfiguration method. Validating the data is good practice so that whenever local clients are instantiated, they are instantiated with valid values. The other method, buildCommands, adds local client-instantiated objects to the controller that can be executed whenever a request for execution happens. In the implementation of buildCommands, the method clearAllCommands removes all of the past instantiated Command instances. The old local client instances are cleared so that multiple threads do not use the same local client instances. The method addCommand is called to add the Amazon.com local client and Google local client instances to the controller. When the method buildCommands returns, the Parent interface instance contains a collection of Command implementations that can be called to perform some action and generate results. One last detail is to explain the implementations of the Result and Request interfaces, which are illustrated as follows: public class SearchRequest implements Request { private String _query; public SearchRequest( String query) { _query = query; } public String getQueryString() { return _query; }
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public class SearchResult implements Result { String _url; String _title; String _snippet; String _transactionIdentifier; public SearchResult( String url, String title, String snippet, String transId) { _url = url; _title = title; _snippet = snippet; _transactionIdentifier = transId; } public String getTransactionIdentifier() { return _transactionIdentifier; } public String getURL() { return _url; } public String getTitle() { return _title; } public String getSnippet() { return _snippet; } }
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While I was explaining the Extension pattern, I recommended that you use interfaces to perform typecasts, but in this case there are only the base Request and Result interfaces. There are no SearchResult and SearchRequest interfaces because the classes SearchResult and SearchRequest are specific to the domain of searching. The likelihood that the classes SearchResult and SearchRequest would be used in a different context is fairly unlikely. Though we still want to implement the Extension pattern, we don t need to use an interface, but can use an interface and a class declaration. The other item to note is that both SearchResult and SearchRequest are immutable types. An immutable type is a type that once assigned cannot be modified. In the case of SearchResult and SearchRequest, the data members are assigned in the constructor. The only methods exposed allow the retrieval of the data members, but not modification or assignment.
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