B SingleSelectionTemplate Class

Code for the SingleSelectionTemplate Class

The following is the SingleSelectionTemplate.java class.

package oracle.olapi.examples.chapter10;

import oracle.olapi.data.cursor.CursorManager;
import oracle.olapi.data.cursor.ValueCursor;
import oracle.olapi.data.source.DataProvider;
import oracle.olapi.data.source.DynamicDefinition;
import oracle.olapi.data.source.Source;
import oracle.olapi.data.source.StringSource;
import oracle.olapi.data.source.SourceGenerator;
import oracle.olapi.data.source.Template;
import oracle.olapi.transaction.TransactionProvider;
import oracle.olapi.transaction.NotCommittableException;
import oracle.olapi.transaction.metadataStateManager.MetadataState;
import oracle.olapi.metadata.mdm.MdmAttribute;
import oracle.olapi.metadata.mdm.MdmDimensionMemberInfo;
import oracle.olapi.metadata.mdm.MdmHierarchy;
import oracle.olapi.metadata.mdm.MdmMeasure;
import oracle.olapi.metadata.mdm.MdmPrimaryDimension;
 
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
 
/**
 * A Template that joins Source objects for selected members of
 * dimension hierarchies to a Source for a measure.
 */
public class SingleSelectionTemplate extends Template
{
  // Variable to store the DynamicDefinition.
  private DynamicDefinition _definition;
 
  /**
   * Creates a SingleSelectionTemplate.
   */
  public SingleSelectionTemplate(Source measure, DataProvider dataProvider)
  {
    super(new SingleSelectionTemplateState(measure), dataProvider);
    _definition = createDynamicDefinition(
                          new SingleSelectionTemplateGenerator(dataProvider));
  }
 
  /**
   * Gets the Source produced by the SingleSelectionTemplateGenerator
   * from the DynamicDefinition.
   */
  public final Source getSource()
  {
    return _definition.getSource();
  }
 
  /**
   * Gets the measure stored by the SingleSelectionTemplateState.
   */
  public Source getMeasure()
  {
    SingleSelectionTemplateState state =
                               (SingleSelectionTemplateState) getCurrentState();
    return state.measure;
  }
 
  /**
   * Gets the List of MdmDimensionMemberInfo objects for the selected members
   * of the dimensions.
   */
  public List getDimMemberInfos()
  {
    SingleSelectionTemplateState state =
                               (SingleSelectionTemplateState) getCurrentState();
    return Collections.unmodifiableList(state.dimMemberInfos);
  }
 
  /**
   * Adds an MdmDimensionMemberInfo to the List of
   * MdmDimensionMemberInfo objects.
   */
  public void addDimMemberInfo(MdmDimensionMemberInfo mdmDimMemberInfo)
  {
    SingleSelectionTemplateState state =
                               (SingleSelectionTemplateState) getCurrentState();
    state.dimMemberInfos.add(mdmDimMemberInfo);
    setCurrentState(state);
  }
 
  /**
   * Changes the member specified for a dimension.
   */
  public void changeSelection(MdmDimensionMemberInfo mdmDimMemberInfo)
  {
    SingleSelectionTemplateState state =
                              (SingleSelectionTemplateState) getCurrentState();
    int i = 0;
 
    Iterator dimMemberInfosItr = state.dimMemberInfos.iterator();
    while (dimMemberInfosItr.hasNext())
    {
      MdmDimensionMemberInfo mdmDimMemberInfoInList =
                             (MdmDimensionMemberInfo) dimMemberInfosItr.next();
      MdmPrimaryDimension mdmPrimDim1 = mdmDimMemberInfo.getPrimaryDimension();
      MdmPrimaryDimension mdmPrimDim2 =
                                  mdmDimMemberInfoInList.getPrimaryDimension();
      //String value = (String) valuesItr.next();
      if (mdmPrimDim1.getName().equals(mdmPrimDim2.getName()))
      {
        state.dimMemberInfos.remove(i);
        state.dimMemberInfos.add(i, mdmDimMemberInfo);
        break;
      }
      i++;
    }
 
    setCurrentState(state);
  }
 
  /**
   * Gets the short value description of the each of the dimension members
   * specified by the list of MdmDimensionMemberInfo objects and returns
   * the descriptions in a StringBuffer.
   */
  public StringBuffer getMemberShortDescrs(DataProvider dp,
                                    TransactionProvider tp)
  {
    boolean firsttime = true;
 
    List mdmDimMemInfoList = getDimMemberInfos();
 
    StringBuffer shortDescrForMemberVals = new StringBuffer(" ");
    Iterator mdmDimMemInfoListItr = mdmDimMemInfoList.iterator();
 
    while(mdmDimMemInfoListItr.hasNext())
    {
      MdmDimensionMemberInfo mdmDimMemInfo = (MdmDimensionMemberInfo)
                                              mdmDimMemInfoListItr.next();
      MdmPrimaryDimension mdmPrimDim = mdmDimMemInfo.getPrimaryDimension();
      MdmAttribute mdmShortDescrAttr = 
                                 mdmPrimDim.getShortValueDescriptionAttribute();
      Source shortDescrAttr = mdmShortDescrAttr.getSource();
      MdmHierarchy mdmHier = mdmDimMemInfo.getHierarchy();
      StringSource hierSrc = (StringSource) mdmHier.getSource();
      Source memberSel = hierSrc.selectValue(mdmDimMemInfo.getUniqueValue());
      Source shortDescrForMember = shortDescrAttr.joinHidden(memberSel);
 
      // Prepare and commit the current transaction.
      try
      {
          tp.prepareCurrentTransaction();
      }
      catch(NotCommittableException e)
      {
        System.out.println("Cannot commit the current Transaction. " + e);
      }
      tp.commitCurrentTransaction();
 
      CursorManager cmngr = dp.createCursorManager(shortDescrForMember);
      ValueCursor valCursor = (ValueCursor) cmngr.createCursor();
 
      String shortDescrForMemberVal = valCursor.getCurrentString();
 
      if(firsttime)
      {
        shortDescrForMemberVals.append(shortDescrForMemberVal);
        firsttime = false;
      }
      else
      {
        shortDescrForMemberVals.append(", " + shortDescrForMemberVal);
      }
    }
 
    return shortDescrForMemberVals;
  }
 
  /**
   * Inner class that implements the MetadataState object for this Template.
   * Stores data that can be changed by its SingleSelectionTemplate.
   * The data is used by a SingleSelectionTemplateGenerator in producing
   * a Source for the SingleSelectionTemplate.
   */
  private static class SingleSelectionTemplateState
     implements MetadataState
  {
    public Source measure;
    public ArrayList dimMemberInfos;
 
    /**
     * Creates a SingleSelectionTemplateState.
     */
    public SingleSelectionTemplateState(Source measure)
    {
      this(measure, new ArrayList());
    }
 
    private SingleSelectionTemplateState(Source measure,
                                         ArrayList dimMemberInfos)
    {
      this.measure = measure;
      this.dimMemberInfos = dimMemberInfos;
    }
 
    public Object clone()
    {
      return new SingleSelectionTemplateState(measure,
                                              (ArrayList) 
                                               dimMemberInfos.clone());
    }
  }
 
  /**
   * Inner class that implements the SourceGenerator object for this Template.
   * Produces a Source based on the data values of a SingleSelectionTemplate.
   */
  private static final class SingleSelectionTemplateGenerator
      implements SourceGenerator
  {
    DataProvider dp = null;
 
    /**
     * Creates a SingleSelectionTemplateGenerator.
     */
    public SingleSelectionTemplateGenerator(DataProvider dataProvider)
    {
      dp = dataProvider;
    }
 
    /**
     * Generates a Source for the SingleSelectionTemplate.
     */
    public Source generateSource(MetadataState state)
    {
      SingleSelectionTemplateState castState =
                                       (SingleSelectionTemplateState) state;
      Source result = castState.measure;
 
      Iterator dimMemberInfosItr = castState.dimMemberInfos.iterator();
      while (dimMemberInfosItr.hasNext())
      {
        MdmDimensionMemberInfo mdmDimMemInfo = (MdmDimensionMemberInfo)
                                                dimMemberInfosItr.next();
        MdmHierarchy mdmHier = mdmDimMemInfo.getHierarchy();
        StringSource hierSrc = (StringSource) mdmHier.getSource();
        Source memberSel = hierSrc.selectValue(mdmDimMemInfo.getUniqueValue());
        // Join the Source objects for the selected dimension members
        // to the measure.
        result = result.joinHidden(memberSel);
      }
      return result;
    }
  }
}