BasicFieldValueConstraint


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: BasicFieldValueConstraint.java,v 1.11 2005/04/25 14:56:57 pierre Exp $
20   * @since MMBase-1.7
21   */
22  public class BasicFieldValueConstraint extends BasicFieldCompareConstraint
23  implements FieldValueConstraint {
24  
25      /** The value. */
26      private Object   value = null;
27  
28      /**
29       * Constructor.
30       * Depending on the field type, the value must be of type
31       * <code>String</code> or <code>Number</code>.
32       *
33       * @param field The associated field.
34       * @param value The non-null property value.
35       * @throws IllegalArgumentException when an invalid argument is supplied.
36       */
37      public BasicFieldValueConstraint(StepField field, Object   value) {
38          super(field);
39          setValue(value);
40      }
41  
42      /**
43       * Sets value property.
44       * Depending on the field type, the value must be of type
45       * <code>String</code> or <code>Number</code>.
46       *
47       * @param value The non-null property value.
48       * @return This <code>BasicFieldValueConstraint</code> instance.
49       * @throws IllegalArgumentException when an invalid argument is supplied.
50       */
51      public BasicFieldValueConstraint setValue(Object   value) {
52          BasicStepField.testValue(value, getField());
53          this.value = value;
54          return this;
55      }
56  
57      // javadoc is inherited
58      public Object   getValue() {
59          return value;
60      }
61  
62      // javadoc is inherited
63      public boolean equals(Object   obj) {
64          // Must be same class (subclasses should override this)!
65          if (obj != null && obj.getClass() == getClass()) {
66              BasicFieldValueConstraint constraint
67                  = (BasicFieldValueConstraint) obj;
68              return isInverse() == constraint.isInverse()
69                  && isCaseSensitive() == constraint.isCaseSensitive()
70                  && getField().getFieldName().equals(constraint.getField().getFieldName())
71                  && BasicStepField.compareSteps(getField().getStep(),
72                      constraint.getField().getStep())
73                  && getOperator() == constraint.getOperator()
74                  && BasicStepField.equalFieldValues(value, constraint.value);
75          } else {
76              return false;
77          }
78      }
79  
80      // javadoc is inherited
81      public int hashCode() {
82          return super.hashCode()
83          + (value == null? 0: value.hashCode());
84      }
85  
86      // javadoc is inherited
87      public String   toString() {
88          StringBuffer   sb = new StringBuffer  ("BasicFieldValueConstraint(inverse:").
89          append(isInverse()).
90          append(", field:").append(getFieldName()).
91          append(", casesensitive:").append(isCaseSensitive()).
92          append(", operator:").append(getOperatorDescription()).
93          append(", value:").append(getValue()).
94          append(")");
95          return sb.toString();
96      }
97  }
98
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