SuppressionProc


1   package jimm.datavision;
2   import jimm.datavision.field.Field;
3   import jimm.util.XMLWriter;
4   
5   /**
6    * A suppression proc is an object used to decide if data should be
7    * displayed or not. It returns <code>true</code> if the data should
8    * be displayed or <code>false</code> if the data should be supressed
9    * (should not be displayed).
10   *
11   * @author Jim Menard, <a HREF="mailto:jimm@io.com">jimm@io.com</a>
12   */
13  public class SuppressionProc implements Writeable {
14  
15  protected Formula formula;
16  protected Report report;
17  protected boolean hiding;
18  
19  public SuppressionProc(Report report) {
20      this.report = report;
21      hiding = false;
22  }
23  
24  public boolean isHidden() { return hiding; }
25  public void setHidden(boolean val) { hiding = val; }
26  
27  /**
28   * Returns formula used when not hiding.
29   *
30   * @return formula used when not hiding
31   */
32  public Formula getFormula() {
33      if (formula == null) {
34      formula = new Formula(null, report, "");
35      report = null;      // Don't need it anymore
36      }
37      return formula;
38  }
39  
40  public boolean refersTo(Field f) {
41      return formula != null && formula.refersTo(f);
42  }
43  
44  public boolean refersTo(Formula f) {
45      return formula != null && (f == formula || formula.refersTo(f));
46  }
47  
48  public boolean refersTo(UserColumn uc) {
49      return formula != null && formula.refersTo(uc);
50  }
51  
52  public boolean refersTo(Parameter p) {
53      return formula != null && formula.refersTo(p);
54  }
55  
56  
57  /**
58   * Returns <code>true</code> if the data should be suppressed (not displayed).
59   * Returns <code>false</code> if the data should not be supressed (it should
60   * be displayed).
61   *
62   * @return <code>true</code> if the data should be suppressed (not displayed)
63   */
64  public boolean suppress() {
65      if (hiding)
66      return true;
67      if (formula == null)
68      return false;
69  
70      String   expr = formula.getExpression();
71      if (expr == null || expr.length() == 0)
72      return false;
73  
74      Object   obj = formula.eval();
75      if (obj == null)    // Bogus BSF code format (bad column)
76      return false;
77      return ((Boolean  )obj).booleanValue();
78  }
79  
80  /**
81   * Writes this suppression proc as an XML tag.
82   *
83   * @param out a writer that knows how to write XML
84   */
85  public void writeXML(XMLWriter out) {
86      String   expression = null;
87      boolean hasFormula = formula != null
88      && (expression = formula.getExpression()) != null
89      && expression.length() > 0;
90  
91      if (!hiding && !hasFormula)
92      return;
93  
94      out.startElement("suppression-proc");
95      if (hiding)
96      out.attr("hide", true);
97  
98      if (hasFormula)
99      formula.writeXML(out);
100 
101     out.endElement();
102 }
103 
104 }
105
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