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1   /*
2    * $Id: StringToNumber.java 22409 2011-07-14 05:14:27Z dirk.olmes $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
5    *
6    * The software in this package is published under the terms of the CPAL v1.0
7    * license, a copy of which has been included with this distribution in the
8    * LICENSE.txt file.
9    */
10  
11  package org.mule.transformer.simple;
12  
13  import org.mule.api.transformer.DataType;
14  import org.mule.api.transformer.DiscoverableTransformer;
15  import org.mule.api.transformer.TransformerException;
16  import org.mule.transformer.AbstractTransformer;
17  import org.mule.transformer.types.DataTypeFactory;
18  import org.mule.transformer.types.SimpleDataType;
19  import org.mule.util.NumberUtils;
20  
21  import java.text.NumberFormat;
22  
23  /**
24   * <code>StringToNumber</code> converts a String to a Number. A NumberFormat is used
25   * if one is provided.
26   */
27  public class StringToNumber extends AbstractTransformer implements DiscoverableTransformer
28  {
29  
30      private NumberFormat numberFormat;
31  
32      /**
33       * Give core transformers a slighty higher priority
34       */
35      private int priorityWeighting = DiscoverableTransformer.DEFAULT_PRIORITY_WEIGHTING + 1;
36  
37      public StringToNumber()
38      {
39          registerSourceType(new SimpleDataType<Object>(String.class));
40          setReturnDataType(DataTypeFactory.create(Number.class));
41      }
42  
43      public StringToNumber(NumberFormat numberFormat)
44      {
45          this();
46          this.numberFormat = numberFormat;
47      }
48  
49      @Override
50      public Object doTransform(Object src, String outputEncoding) throws TransformerException
51      {
52          if (src == null)
53          {
54              return null;
55          }
56          else
57          {
58              if (numberFormat != null)
59              {
60                  try
61                  {
62                      return NumberUtils.convertNumberToTargetClass(numberFormat.parse((String) src),
63                          getReturnClass());
64                  }
65                  catch (Exception e)
66                  {
67                      throw new TransformerException(this, e);
68                  }
69              }
70              else
71              {
72                  return NumberUtils.parseNumber((String) src, getReturnClass());
73              }
74          }
75      }
76  
77      @SuppressWarnings({"unchecked"})
78      @Override
79      public Class<? extends Number> getReturnClass()
80      {
81          return (Class<Number>) super.getReturnDataType().getType();
82      }
83  
84      @Override
85      public void setReturnDataType(DataType<?> type)
86      {
87          if (!Number.class.isAssignableFrom(type.getType()))
88          {
89              throw new IllegalArgumentException("This transformer only supports Number return types.");
90          }
91          else
92          {
93              super.setReturnDataType(type);
94          }
95      }
96  
97      @Override
98      public int getPriorityWeighting()
99      {
100         return priorityWeighting;
101     }
102 
103     @Override
104     public void setPriorityWeighting(int priorityWeighting)
105     {
106         this.priorityWeighting = priorityWeighting;
107     }
108 
109 }