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From craig...@apache.org
Subject cvs commit: jakarta-commons-sandbox/workflow/src/java/org/apache/commons/workflow/core NotAndStep.java NotOrStep.java CoreRuleSet.java
Date Sun, 18 Nov 2001 22:19:13 GMT
craigmcc    01/11/18 14:19:13

  Modified:    workflow/src/java/org/apache/commons/workflow/core
                        CoreRuleSet.java
  Added:       workflow/src/java/org/apache/commons/workflow/core
                        NotAndStep.java NotOrStep.java
  Log:
  Add "NotAndStep" and "NotOrStep" implementations that are the exact
  opposite of "AndStep" and "OrStep".  While not strictly required for
  functional completeness, these rules make some logic sequences easier to
  express.
  
  Submitted by:	Colin Sharples <Colin.Sharples@hbl.co.nz>
  
  Revision  Changes    Path
  1.5       +39 -4     jakarta-commons-sandbox/workflow/src/java/org/apache/commons/workflow/core/CoreRuleSet.java
  
  Index: CoreRuleSet.java
  ===================================================================
  RCS file: /home/cvs/jakarta-commons-sandbox/workflow/src/java/org/apache/commons/workflow/core/CoreRuleSet.java,v
  retrieving revision 1.4
  retrieving revision 1.5
  diff -u -r1.4 -r1.5
  --- CoreRuleSet.java	2001/09/19 15:26:16	1.4
  +++ CoreRuleSet.java	2001/11/18 22:19:13	1.5
  @@ -1,7 +1,7 @@
   /*
  - * $Header: /home/cvs/jakarta-commons-sandbox/workflow/src/java/org/apache/commons/workflow/core/CoreRuleSet.java,v
1.4 2001/09/19 15:26:16 craigmcc Exp $
  - * $Revision: 1.4 $
  - * $Date: 2001/09/19 15:26:16 $
  + * $Header: /home/cvs/jakarta-commons-sandbox/workflow/src/java/org/apache/commons/workflow/core/CoreRuleSet.java,v
1.5 2001/11/18 22:19:13 craigmcc Exp $
  + * $Revision: 1.5 $
  + * $Date: 2001/11/18 22:19:13 $
    *
    * ====================================================================
    *
  @@ -76,7 +76,8 @@
    * </pre>
    *
    * @author Craig R. McClanahan
  - * @version $Revision: 1.4 $ $Date: 2001/09/19 15:26:16 $
  + * @author Preston Sheldon
  + * @version $Revision: 1.5 $ $Date: 2001/11/18 22:19:13 $
    */
   
   public class CoreRuleSet extends BaseRuleSet {
  @@ -242,6 +243,40 @@
               (prefix + "load", "addStep",
                "org.apache.commons.workflow.Step");
   
  +        digester.addObjectCreate
  +            (prefix + "notAnd",
  +             "org.apache.commons.workflow.core.AndNotStep");
  +        digester.addSetProperties
  +            (prefix + "notAnd");
  +        digester.addSetNext
  +            (prefix + "notAnd", "addStep",
  +             "org.apache.commons.workflow.Step");
  +        digester.addObjectCreate
  +            (prefix + "notAnd/descriptor",
  +             "org.apache.commons.workflow.base.BaseDescriptor");
  +        digester.addSetProperties
  +            (prefix + "notAnd/descriptor");
  +        digester.addSetNext
  +            (prefix + "notAnd/descriptor", "addDescriptor",
  +             "org.apache.commons.workflow.Descriptor");        
  +            
  +        digester.addObjectCreate
  +            (prefix + "notOr",
  +             "org.apache.commons.workflow.core.OrStep");
  +        digester.addSetProperties
  +            (prefix + "notOr");
  +        digester.addSetNext
  +            (prefix + "notOr", "addStep",
  +             "org.apache.commons.workflow.Step");
  +        digester.addObjectCreate
  +            (prefix + "notOr/descriptor",
  +             "org.apache.commons.workflow.base.BaseDescriptor");
  +        digester.addSetProperties
  +            (prefix + "notOr/descriptor");
  +        digester.addSetNext
  +            (prefix + "notOr/descriptor", "addDescriptor",
  +             "org.apache.commons.workflow.Descriptor");            
  +             
           digester.addObjectCreate
               (prefix + "or",
                "org.apache.commons.workflow.core.OrStep");
  
  
  
  1.1                  jakarta-commons-sandbox/workflow/src/java/org/apache/commons/workflow/core/NotAndStep.java
  
  Index: NotAndStep.java
  ===================================================================
  package org.apache.commons.workflow.core;
  
  import org.apache.commons.workflow.Context;
  import org.apache.commons.workflow.Descriptor;
  import org.apache.commons.workflow.Step;
  import org.apache.commons.workflow.StepException;
  
  
  /**
   * <p>Evaluate properties specified by the associated Descriptors, and
   * transfer control to the specified step if ALL of them are
   * <code>false</code> (if boolean) or null (if Object).
   *
   * <b>This is the exact opposite of AndStep</b>
   *
   * To avoid non-deterministic evaluation stack behavior, all of the 
   * specified Descriptors are always evaluated.</p>
   *
   * <p>Supported Attributes:</p>
   * <ul>
   * <li><strong>step</strong> - Identifier of the Step to which control
   *     should be transferred if the condition is not met.</li>
   * </ul>
   *
   * @version $Revision: 1.1 $ $Date: 2001/11/18 22:19:13 $
   * @author Preston Sheldon
   */
  
  public class NotAndStep extends GotoStep {
  
  
      // ----------------------------------------------------------= Constructors
  
  
      /**
       * Construct a default instance of this Step.
       */
      public NotAndStep() {
  
          super();
  
      }
      /**
       * Construct an instance of this Step with the specified identifier.
       *
       * @param id Step identifier
       */
      public NotAndStep(String id) {
  
          this(id, null, null);
  
      }
      /**
       * Construct a fully configured instance of this Step.
       *
       * @param id Step identifier of this step
       * @param step Step identifier to which control should be redirected
       */
      public NotAndStep(String id, String step) {
  
          this(id, step, null);
  
      }
      /**
       * Construct a fully configured instance of this Step.
       *
       * @param id Step identifier of this step
       * @param step Step identifier to which control should be redirected
       * @param descriptor Initial descriptor to be added
       */
      public NotAndStep(String id, String step, Descriptor descriptor) {
  
          super();
          setId(id);
          setStep(step);
          addDescriptor(descriptor);
  
      }
      // --------------------------------------------------------- Public Methods
  
  
      /**
       * Perform the executable actions related to this Step, in the context of
       * the specified Context.
       *
       * @param context The Context that is tracking our execution state
       *
       * @exception StepException if a processing error has occurred
       */
      public void execute(Context context) throws StepException {
  
          // Process all associated descriptors
          boolean condition = true;
          Descriptor descriptors[] = findDescriptors();
          for (int i = 0; i < descriptors.length; i++) {
              Object value = descriptors[i].get(context);
              if (value == null)
                  condition = false;
              else if ((value instanceof Boolean) &&
                       !((Boolean) value).booleanValue())
                  condition = false;
          }
  
          // Conditionally forward control to the specified step
          if (!condition) {
              Step next = findStep(this.step);
              if (next == null)
                  throw new StepException("Cannot find step '" + step + "'",
                                          this);
              context.setNextStep(next);
          }
                  
      }
  }
  
  
  
  1.1                  jakarta-commons-sandbox/workflow/src/java/org/apache/commons/workflow/core/NotOrStep.java
  
  Index: NotOrStep.java
  ===================================================================
  package org.apache.commons.workflow.core;
  
  import org.apache.commons.workflow.Context;
  import org.apache.commons.workflow.Descriptor;
  import org.apache.commons.workflow.Step;
  import org.apache.commons.workflow.StepException;
  
  
  /**
   * <p>Evaluate properties specified by the associated Descriptors, and
   * transfer control to the specified step if ANY of them are
   * <code>false</code> (if boolean) or null (if Object).
   *
   * <b>This is the exact opposite of OrStep</b>
   *
   * To avoid non-deterministic evaluation stack behavior, all of the
   * specified Descriptors are always evaluated.</p>
   *
   * <p>Supported Attributes:</p>
   * <ul>
   * <li><strong>step</strong> - Identifier of the Step to which control
   *     should be transferred if the condition is met.</li>
   * </ul>
   *
   * @version $Revision: 1.1 $ $Date: 2001/11/18 22:19:13 $
   * @author Preston Sheldon
   */
  
  public class NotOrStep extends GotoStep {
  
  
      // ----------------------------------------------------------= Constructors
  
  
      /**
       * Construct a default instance of this Step.
       */
      public NotOrStep() {
  
          super();
  
      }
      /**
       * Construct an instance of this Step with the specified identifier.
       *
       * @param id Step identifier
       */
      public NotOrStep(String id) {
  
          this(id, null, null);
  
      }
      /**
       * Construct a fully configured instance of this Step.
       *
       * @param id Step identifier of this step
       * @param step Step identifier to which control should be redirected
       */
      public NotOrStep(String id, String step) {
  
          this(id, step, null);
  
      }
      /**
       * Construct a fully configured instance of this Step.
       *
       * @param id Step identifier of this step
       * @param step Step identifier to which control should be redirected
       * @param descriptor Initial descriptor to be added
       */
      public NotOrStep(String id, String step, Descriptor descriptor) {
  
          super();
          setId(id);
          setStep(step);
          addDescriptor(descriptor);
  
      }
      // --------------------------------------------------------- Public Methods
  
  
      /**
       * Perform the executable actions related to this Step, in the context of
       * the specified Context.
       *
       * @param context The Context that is tracking our execution state
       *
       * @exception StepException if a processing error has occurred
       */
      public void execute(Context context) throws StepException {
  
          // Process all associated descriptors
          boolean condition = false;
          Descriptor descriptors[] = findDescriptors();
          for (int i = 0; i < descriptors.length; i++) {
              Object value = descriptors[i].get(context);
              if (value != null) {
                  if (value instanceof Boolean) {
                      if (((Boolean) value).booleanValue())
                          condition = true;
                  } else {
                      condition = true;
                  }
              }
          }
  
          // Conditionally forward control to the specified step
          if (!condition) {
              Step next = findStep(this.step);
              if (next == null)
                  throw new StepException("Cannot find step '" + step + "'",
                                          this);
              context.setNextStep(next);
          }
                  
      }
  }
  
  
  
  

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