Docjar: com/thermidor/xml/output/PrintWriterHandler.java

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Source code: com/thermidor/xml/output/PrintWriterHandler.java

1   package com.thermidor.xml.output;
2   import java.io.IOException;
3   import java.io.File;
4   import java.io.FileOutputStream;
5   import java.io.PrintWriter;
6   import com.thermidor.util.Assert;
7   public class PrintWriterHandler extends OutputHandler {
8       /**
9        * Construct a new default instance of a PrintWriterHandler.
10       */
11      public PrintWriterHandler() {
12          super();
13      }
14      /**
15       * <code>start</code> is called on the output handler to initialize it
16       * ready to start processing output.
17       * @param data the initialization data.
18       * @throws InvalidInitializationParameter is raised if the initialization 
19       * data was invalid for this instance.
20       * @throws IOException is raised if there was an IO related error.
21       */
22      public void start(Object initializationData) 
23          throws InvalidInitializationParameter,
24                 IOException {
25        try {
26          Assert.notNull(initializationData,
27                         "initialization parameter for handler type [" +
28                         PrintWriterHandler.class +
29                         "] must be non null");
30          Assert.instanceOf(initializationData,
31                            PrintWriter.class,
32                            "initialization parameter for handler type [" +
33                            PrintWriterHandler.class +
34                            "] must be java.io.PrintWriter, but was [" +
35                            initializationData.getClass()+"]");
36        }
37        catch(Assert.AssertException ae) {
38          throw new InvalidInitializationParameter(ae);
39        }
40        _writer = (PrintWriter)initializationData;
41      }    
42      /**
43       * Handle the provided string data .
44       * @param data the text data that is to be output.
45       */
46      public void handle(String data) throws IOException{
47          _writer.print(data);
48      }
49      /**
50       * The responsibilty of the  finished member function is to handle clean up
51       * when the output is popped from the output stack.
52       * @return any relevant string data that was collected will the handler 
53       * is in operation.
54       */
55      public String finish() throws IOException {
56          _writer.flush();
57          return EMPTY;
58      }    
59      
60  }