Oracle® OLAP Java API Developer's Guide 11g Release 2 (11.2) Part Number E10795-06 |
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This appendix contains the code for the SingleSelectionTemplate
class. This class is used by the examples in Chapter 7, "Using a TransactionProvider", and Chapter 10, "Creating Dynamic Queries".
The following is the SingleSelectionTemplate.java
class.
import java.util.ArrayList; import java.util.Collections; import java.util.Iterator; import java.util.List; 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.metadata.mdm.MdmAttribute; import oracle.olapi.metadata.mdm.MdmDimensionMemberInfo; import oracle.olapi.metadata.mdm.MdmHierarchy; import oracle.olapi.metadata.mdm.MdmPrimaryDimension; import oracle.olapi.transaction.TransactionProvider; import oracle.olapi.transaction.NotCommittableException; import oracle.olapi.transaction.metadataStateManager.MetadataState; /** * 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 dynamicDef; /** * Creates a SingleSelectionTemplate. */ public SingleSelectionTemplate(Source measure, DataProvider dataProvider) { super(new SingleSelectionTemplateState(measure), dataProvider); dynamicDef = createDynamicDefinition( new SingleSelectionTemplateGenerator(dataProvider)); } /** * Gets the Source produced by the SingleSelectionTemplateGenerator * from the DynamicDefinition. */ public final Source getSource() { return dynamicDef.getSource(); } /** * Gets the Source for the measure stored by the SingleSelectionTemplateState. */ public Source getMeasure() { SingleSelectionTemplateState state = (SingleSelectionTemplateState)getCurrentState(); return state.measure; } /** * Specifies the Source for the measure stored by the * SingleSelectionTemplateState. */ public void setMeasure(Source measure) { SingleSelectionTemplateState state = (SingleSelectionTemplateState)getCurrentState(); state.measure = measure; setCurrentState(state); } /** * 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) { 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); // Commit the current transaction. try { (dp.getTransactionProvider()).commitCurrentTransaction(); } catch (Exception ex) { println("Could not commit the Transaction. " + ex); } } 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; } } }