BasicFieldNullConstraint


1   /*
2   
3   This software is OSI Certified Open Source Software.
4   OSI Certified is a certification mark of the Open Source Initiative.
5   
6   The license (Mozilla version 1.0) can be read at the MMBase site.
7   See http://www.MMBase.org/license
8   
9   */
10  package org.mmbase.storage.search.implementation;
11  
12  import org.mmbase.storage.search.*;
13  
14  /**
15   * Basic implementation.
16   *
17   * @author Rob van Maris
18   * @version $Id: BasicFieldNullConstraint.java,v 1.4 2005/04/25 14:56:57 pierre Exp $
19   * @since MMBase-1.7
20   */
21  public class BasicFieldNullConstraint extends BasicFieldConstraint
22  implements FieldNullConstraint {
23  
24      /**
25       * Constructor.
26       *
27       * @param field The associated field.
28       * @throws IllegalArgumentException when an invalid argument is supplied.
29       */
30      public BasicFieldNullConstraint(StepField field) {
31          super(field);
32      }
33  
34      // javadoc is inherited
35      public boolean equals(Object   obj) {
36          // Must be same class (subclasses should override this)!
37          if (obj != null && obj.getClass() == getClass()) {
38              BasicFieldNullConstraint constraint = (BasicFieldNullConstraint) obj;
39              return isInverse() == constraint.isInverse()
40                  && isCaseSensitive() == constraint.isCaseSensitive()
41                  && getField().getFieldName().equals(constraint.getField().getFieldName())
42                  && BasicStepField.compareSteps(getField().getStep(),
43                      constraint.getField().getStep());
44          } else {
45              return false;
46          }
47      }
48  
49      // javadoc is inherited
50      public int hashCode() {
51          return super.hashCode();
52      }
53  
54      // javadoc is inherited
55      public String   toString() {
56          StringBuffer   sb = new StringBuffer  ("FieldNullConstraint(inverse:").
57          append(isInverse()).
58          append(", field:").append(getFieldName()).
59          append(", casesensitive:").append(isCaseSensitive()).
60          append(")");
61          return sb.toString();
62      }
63  }
64
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