FloatParser


1   package prefuse.data.parser;
2   
3   /**
4    * DataParser instance that parses float values from a text string. Float
5    * values can be explicitly coded for by using a 'f' at the end of a
6    * number. For example "1.0" could parse as a double or a float, but
7    * "1.0f" will only parse as a float.
8    *  
9    * @author <a HREF="http://jheer.org">jeffrey heer</a>
10   */
11  public class FloatParser implements DataParser {
12      
13      /**
14       * Returns float.class.
15       * @see prefuse.data.parser.DataParser#getType()
16       */
17      public Class   getType() {
18          return float.class;
19      }
20      
21      /**
22       * @see prefuse.data.parser.DataParser#format(java.lang.Object)
23       */
24      public String   format(Object   value) {
25          if ( value == null ) return null;
26          if ( !(value instanceof Number  ) )
27              throw new IllegalArgumentException  (
28                "This class can only format Objects of type Number.");
29          return String.valueOf(((Number  )value).floatValue())+"f";
30      }
31      
32      /**
33       * @see prefuse.data.parser.DataParser#canParse(java.lang.String)
34       */
35      public boolean canParse(String   text) {        
36          try {
37              Float.parseFloat(text);
38              return true;
39          } catch ( NumberFormatException   e ) {
40              return false;
41          }
42      }
43  
44      /**
45       * @see prefuse.data.parser.DataParser#parse(java.lang.String)
46       */
47      public Object   parse(String   text) throws DataParseException {
48          return new Float  (parseFloat(text));
49      }
50      
51      /**
52       * Parse a float value from a text string.
53       * @param text the text string to parse
54       * @return the parsed float value
55       * @throws DataParseException if an error occurs during parsing
56       */
57      public static float parseFloat(String   text) throws DataParseException {
58          try {
59              return Float.parseFloat(text);
60          } catch ( NumberFormatException   e ) {
61              throw new DataParseException(e);
62          }
63      }
64      
65  } // end of class FloatParser
66
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