String2DoubleValidator


1   /*
2    * Copyright (C) 2005 db4objects Inc.  http://www.db4o.com
3    * 
4    * All rights reserved. This program and the accompanying materials
5    * are made available under the terms of the Eclipse Public License v1.0
6    * which accompanies this distribution, and is available at
7    * http://www.eclipse.org/legal/epl-v10.html
8    *
9    * Contributors:
10   *     db4objects - Initial API and implementation
11   */
12  package org.eclipse.jface.internal.databinding.provisional.validation;
13  
14  import org.eclipse.jface.internal.databinding.internal.BindingMessages;
15  
16  
17  /**
18   * DoubleValidator.  Verify data input for Doubles
19   *
20   * @author djo
21   */
22  public class String2DoubleValidator implements IValidator {
23      
24      /* (non-Javadoc)
25       * @see org.eclipse.jface.databinding.validator.IValidator#isPartiallyValid(java.lang.Object)
26       */
27      public ValidationError isPartiallyValid(Object   fragment) {
28          if (((String  )fragment).matches("\\-?[0-9]*\\.?[0-9]*([0-9]+[e|E]\\-?([0-9]+\\.)?[0-9]*)?")) //$NON-NLS-1$
29              return null;
30  
31          return ValidationError.error(getHint());
32      }
33      
34      /* (non-Javadoc)
35       * @see org.eclipse.jface.viewers.ICellEditorValidator#isValid(java.lang.Object)
36       */
37      public ValidationError isValid(Object   value) {
38          try {
39              Double.parseDouble((String  )value);
40              return null;
41          } catch (Throwable   t) {
42              return ValidationError.error(getHint());
43          }
44      }
45  
46      private String   getHint() {
47          return BindingMessages.getString("Validate_Like") +  //$NON-NLS-1$
48              BindingMessages.getString("Validate_Number_Examples") //$NON-NLS-1$
49              + Double.MIN_VALUE + 
50              ", " + Double.MAX_VALUE + "."; //$NON-NLS-1$ //$NON-NLS-2$
51      }
52  
53  }
54

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