BasicCompareFieldsConstraint


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   * The tested operation is equality, unless it is explicitly set.
17   *
18   * @author Rob van Maris
19   * @version $Id: BasicCompareFieldsConstraint.java,v 1.6 2005/10/02 16:18:15 michiel Exp $
20   * @since MMBase-1.7
21   */
22  public class BasicCompareFieldsConstraint extends BasicFieldCompareConstraint
23  implements CompareFieldsConstraint {
24  
25      /** The second associated field. */
26      private StepField field2 = null;
27  
28      /**
29       * Constructor.
30       *
31       * @param field1 The associated field.
32       * @param field2 The second associated field.
33       * @throws IllegalArgumentException when an invalid argument is supplied.
34       */
35      public BasicCompareFieldsConstraint(StepField field1, StepField field2) {
36          super(field1);
37  
38          // Test for non-null value.
39          if (field2 == null) {
40              throw new IllegalArgumentException  (
41              "Invalid field2 value: " + field2);
42          }
43  
44          // Test for matching fieldtype.
45          if (field1.getType() != field2.getType()) {
46              throw new IllegalArgumentException  (
47              "Fieldtypes do not match: " + field1.getType()
48              + " and " + field2.getType());
49          }
50          this.field2 = field2;
51      }
52  
53      // javadoc is inherited
54      public StepField getField2() {
55          return field2;
56      }
57  
58      // javadoc is inherited
59      public boolean equals(Object   obj) {
60          // Must be same class (subclasses should override this)!
61          if (obj != null && obj.getClass() == getClass()) {
62              BasicCompareFieldsConstraint constraint
63                  = (BasicCompareFieldsConstraint) obj;
64              return isInverse() == constraint.isInverse()
65                  && isCaseSensitive() == constraint.isCaseSensitive()
66                  && getField().getFieldName().equals(constraint.getField().getFieldName())
67                  && BasicStepField.compareSteps(getField().getStep(),
68                      constraint.getField().getStep())
69                  && getOperator() == constraint.getOperator()
70                  && field2.getFieldName().equals(constraint.getField2().getFieldName())
71                  && BasicStepField.compareSteps(field2.getStep(),
72                      constraint.getField2().getStep());
73          } else {
74              return false;
75          }
76      }
77  
78      // javadoc is inherited
79      public int hashCode() {
80          return super.hashCode()
81          + 93 * field2.getFieldName().hashCode()
82          + (field2.getStep().getAlias() == null?
83              101 * field2.getStep().getTableName().hashCode():
84              97 * field2.getStep().getAlias().hashCode());
85      }
86  
87      // javadoc is inherited
88      public String   toString() {
89          StringBuffer   sb = new StringBuffer  ("CompareFieldsConstraint(inverse:").
90          append(isInverse()).
91          append(", field:").append(getFieldName()).
92          append(", casesensitive:").append(isCaseSensitive()).
93          append(", operator:").append(getOperatorDescription()).
94          append(", field2:").append(BasicStepField.getFieldName(getField2())).
95          append(")");
96          return sb.toString();
97      }
98  }
99
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