[incubator-kie-issues#854] DMN - Add implicit type conversion of date to date and time when necessary

kie-dmn/kie-dmn-core/src/main/java/org/kie/dmn/core/ast/DMNContextEvaluator.java

@@ -18,6 +18,9 @@
  */
 package org.kie.dmn.core.ast;
 
+import java.time.LocalDate;
+import java.time.ZoneOffset;
+import java.time.ZonedDateTime;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
@@ -37,6 +40,7 @@
 import org.kie.dmn.core.impl.DMNResultImpl;
 import org.kie.dmn.core.impl.DMNRuntimeEventManagerUtils;
 import org.kie.dmn.core.impl.DMNRuntimeImpl;
+import org.kie.dmn.core.impl.SimpleTypeImpl;
 import org.kie.dmn.core.util.Msg;
 import org.kie.dmn.core.util.MsgUtil;
 import org.kie.dmn.model.api.Context;
@@ -99,12 +103,8 @@ public EvaluatorResult evaluate(DMNRuntimeEventManager eventManager, DMNResult d
                     EvaluatorResult er = ed.getEvaluator().evaluate( eventManager, result );
                     if ( er.getResultType() == ResultType.SUCCESS ) {
                         Object value = er.getResult();
-                        if( ! ed.getType().isCollection() && value instanceof Collection &&
-                            ((Collection)value).size()==1 ) {
-                            // spec defines that "a=[a]", i.e., singleton collections should be treated as the single element
-                            // and vice-versa
-                            value = ((Collection)value).toArray()[0];
-                        }
+                        value = optionallyConvertCollectionToArray(value, ed.getType());
+                        value = optionallyConvertDateToDateTime(value, ed.getType());
 
                         if (((DMNRuntimeImpl) eventManager.getRuntime()).performRuntimeTypeCheck(result.getModel())) {
                             if (!(ed.getContextEntry().getExpression() instanceof FunctionDefinition)) {
@@ -172,6 +172,28 @@ public EvaluatorResult evaluate(DMNRuntimeEventManager eventManager, DMNResult d
         }
     }
 
+    static Object optionallyConvertCollectionToArray(Object originalValue, DMNType requiredType) {
+        Object toReturn = originalValue;
+        if( ! requiredType.isCollection() &&
+                originalValue instanceof Collection collection &&
+                collection.size()==1 ) {
+            // spec defines that "a=[a]", i.e., singleton collections should be treated as the single element
+            // and vice-versa
+            toReturn = collection.toArray()[0];
+        }
+        return toReturn;
+    }
+
+    static Object optionallyConvertDateToDateTime(Object originalValue, DMNType requiredType) {
+        Object toReturn = originalValue;
+        if (originalValue instanceof LocalDate localDate &&
+                requiredType instanceof SimpleTypeImpl simpleType &&
+                simpleType.getFeelType().getName().equals("date and time")) {
+                toReturn = ZonedDateTime.of(localDate.getYear(), localDate.getMonthValue(), localDate.getDayOfMonth(), 0, 0, 0, 0, ZoneOffset.UTC);
+            }
+        return toReturn;
+    }
+
     private String getEntryExprId(ContextEntryDef ed) {
         return ed.getContextEntry().getExpression() != null ? ed.getContextEntry().getExpression().getId() : null;
     }

kie-dmn/kie-dmn-core/src/main/java/org/kie/dmn/core/compiler/DMNFEELHelper.java

@@ -25,8 +25,11 @@
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Queue;
 
+import javax.xml.namespace.QName;
+
 import org.antlr.v4.runtime.CommonToken;
 import org.kie.dmn.api.core.DMNContext;
 import org.kie.dmn.api.core.DMNMessage;
@@ -53,6 +56,7 @@
 import org.kie.dmn.feel.runtime.events.UnknownVariableErrorEvent;
 import org.kie.dmn.feel.util.ClassLoaderUtil;
 import org.kie.dmn.model.api.DMNElement;
+import org.kie.dmn.model.api.InformationItem;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -138,6 +142,17 @@ public CompiledExpression compileFeelExpression(DMNCompilerContext ctx, String e
             feelctx.addInputVariableType( entry.getKey(), ((BaseDMNTypeImpl) entry.getValue()).getFeelType() );
         }
         feelctx.setFEELTypeRegistry(model.getTypeRegistry());
+        // TODO: EXPERIMENT
+        String baseExpression = expression.contains("(") ? expression.substring(0, expression.indexOf("(")) : expression;
+        baseExpression = baseExpression.replace(" ", "");
+        if (baseExpression.equals("date")) {
+            Optional<Type> type = getTypeFromParent(element, feelctx);
+           // Optional<QName> qnameType = getFirstInformationItemQNameFromParent(element);
+            if (type.isPresent() &&
+                    type.get().getName().equals("date and time")) {
+                expression = "date and time" + (expression.substring(expression.indexOf("(")));
+            }
+        }
         CompiledExpression ce = feel.compile( expression, feelctx );
         processEvents( model, element, errorMsg, msgParams );
         return ce;
@@ -308,4 +323,43 @@ public ClassOrInterfaceDeclaration generateFeelExpressionSource(String input, Co
     public CompilationUnit generateFeelExpressionCompilationUnit(String input, CompilerContext compilerContext1) {
         return ((FEELImpl) feel).compileExpression(input, compilerContext1).getSourceCode();
     }
+
+//    static String optionallyFixDateWithDateTimeExpression() {
+//
+//    }
+
+    /**
+     * Returns the <code>Optional&lt;QName&gt;</code> from the first <code>InformationItem</code> found in
+     * the <code>element</code>'s parent, if found, otherwise <code>Optional.empty()</code>
+     * @param element
+     * @return
+     */
+    static Optional<Type> getTypeFromParent(DMNElement element, CompilerContext feelctx) {
+        return element.getParent() != null ?
+                element.getParent().getChildren()
+                        .stream()
+                        .filter(InformationItem.class::isInstance)
+                        .findFirst()
+                        .map(i -> (InformationItem)i)
+                        .filter(i -> feelctx.getInputVariableTypes().containsKey(i.getName()))
+                        .map(i -> feelctx.getInputVariableTypes().get(i.getName())) :
+                Optional.empty();
+    }
+
+    /**
+     * Returns the <code>Optional&lt;QName&gt;</code> from the first <code>InformationItem</code> found in
+     * the <code>element</code>'s parent, if found, otherwise <code>Optional.empty()</code>
+     * @param element
+     * @return
+     */
+    static Optional<QName> getFirstInformationItemQNameFromParent(DMNElement element) {
+        return element.getParent() != null ?
+                element.getParent().getChildren()
+                        .stream()
+                        .filter(InformationItem.class::isInstance)
+                        .findFirst()
+                        .map(i -> (InformationItem)i)
+                        .map(InformationItem::getTypeRef) :
+                Optional.empty();
+    }
 }

kie-dmn/kie-dmn-core/src/test/java/org/kie/dmn/core/DMNRuntimeTest.java

@@ -634,6 +634,7 @@ public void testDateAndTime() {
         assertThat(ctx.get("Date-Time")).isEqualTo( ZonedDateTime.of( 2016, 12, 24, 23, 59, 0, 0, ZoneOffset.ofHours( -5 )));
         assertThat(ctx.get("Date")).isEqualTo( new HashMap<String, Object>(  ) {{
             put( "fromString", LocalDate.of( 2015, 12, 24 ) );
+            put( "fromStringToDateTime", ZonedDateTime.of( 2015, 12, 24, 0, 0, 0, 0, ZoneOffset.UTC) );
             put( "fromDateTime", LocalDate.of( 2016, 12, 24 ) );
             put( "fromYearMonthDay", LocalDate.of( 1999, 11, 22 ) );
         }});

kie-dmn/kie-dmn-core/src/test/java/org/kie/dmn/core/ast/DMNContextEvaluatorTest.java

@@ -0,0 +1,183 @@
+package org.kie.dmn.core.ast;
+
+import java.io.File;
+import java.math.BigDecimal;
+import java.net.URL;
+import java.time.Duration;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.time.ZoneOffset;
+import java.time.ZonedDateTime;
+import java.util.Collections;
+import java.util.stream.Collectors;
+
+import org.drools.util.FileUtils;
+import org.junit.Test;
+import org.kie.dmn.api.core.DMNContext;
+import org.kie.dmn.api.core.DMNModel;
+import org.kie.dmn.api.core.DMNRuntime;
+import org.kie.dmn.api.core.DMNType;
+import org.kie.dmn.api.core.ast.DecisionNode;
+import org.kie.dmn.core.api.DMNExpressionEvaluator;
+import org.kie.dmn.core.api.DMNFactory;
+import org.kie.dmn.core.api.EvaluatorResult;
+import org.kie.dmn.core.impl.DMNDecisionResultImpl;
+import org.kie.dmn.core.impl.DMNResultImpl;
+import org.kie.dmn.core.impl.DMNResultImplFactory;
+import org.kie.dmn.core.impl.SimpleTypeImpl;
+import org.kie.dmn.core.util.DMNRuntimeUtil;
+import org.kie.dmn.feel.lang.types.BuiltInType;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.*;
+
+public class DMNContextEvaluatorTest {
+
+    private DMNResultImplFactory dmnResultFactory = new DMNResultImplFactory();
+
+    @Test
+    public void optionallyConvertCollectionToArrayConverted() {
+        Object item = "TESTED_OBJECT";
+        Object value = Collections.singleton(item);
+        DMNType requiredType = new SimpleTypeImpl("http://www.omg.org/spec/DMN/20180521/FEEL/",
+                                                  "string",
+                                                  null,
+                                                  false,
+                                                  null,
+                                                  null,
+                                                  BuiltInType.STRING);
+        Object retrieved = DMNContextEvaluator.optionallyConvertCollectionToArray(value, requiredType);
+        assertNotNull(retrieved);
+        assertEquals(item, retrieved);
+    }
+
+    @Test
+    public void optionallyConvertCollectionToArrayNotConverted() {
+        Object item = "TESTED_OBJECT";
+        Object value = Collections.singleton(item);
+        DMNType requiredType = new SimpleTypeImpl("http://www.omg.org/spec/DMN/20180521/FEEL/",
+                                                  "string",
+                                                  null,
+                                                  true,
+                                                  null,
+                                                  null,
+                                                  BuiltInType.STRING);
+        Object retrieved = DMNContextEvaluator.optionallyConvertCollectionToArray(value, requiredType);
+        assertNotNull(retrieved);
+        assertEquals(value, retrieved);
+        value = "TESTED_OBJECT";
+        requiredType = new SimpleTypeImpl("http://www.omg.org/spec/DMN/20180521/FEEL/",
+                                                  "string",
+                                                  null,
+                                                  false,
+                                                  null,
+                                                  null,
+                                                  BuiltInType.STRING);
+        retrieved = DMNContextEvaluator.optionallyConvertCollectionToArray(value, requiredType);
+        assertNotNull(retrieved);
+        assertEquals(value, retrieved);
+    }
+
+    @Test
+    public void optionallyConvertDateToDateTimeConverted() {
+        Object value = LocalDate.now();
+        DMNType requiredType = new SimpleTypeImpl("http://www.omg.org/spec/DMN/20180521/FEEL/",
+                                                  "date and time",
+                                                  null,
+                                                  false,
+                                                  null,
+                                                  null,
+                                                  BuiltInType.DATE_TIME);
+        Object retrieved = DMNContextEvaluator.optionallyConvertDateToDateTime(value, requiredType);
+        assertNotNull(retrieved);
+        assertTrue(retrieved instanceof ZonedDateTime);
+        ZonedDateTime zdtRetrieved = (ZonedDateTime)retrieved;
+        assertEquals(value, zdtRetrieved.toLocalDate());
+        assertEquals(ZoneOffset.UTC, zdtRetrieved.getOffset());
+        assertEquals(0, zdtRetrieved.getHour());
+        assertEquals(0, zdtRetrieved.getMinute());
+        assertEquals(0, zdtRetrieved.getSecond());
+    }
+
+    @Test
+    public void optionallyConvertDateToDateTimeNotConverted() {
+        Object value = "TEST_OBJECT";
+        DMNType requiredType = new SimpleTypeImpl("http://www.omg.org/spec/DMN/20180521/FEEL/",
+                                                  "date and time",
+                                                  null,
+                                                  false,
+                                                  null,
+                                                  null,
+                                                  BuiltInType.DATE_TIME);
+        Object retrieved = DMNContextEvaluator.optionallyConvertDateToDateTime(value, requiredType);
+        assertNotNull(retrieved);
+        assertEquals(value, retrieved);
+        value = LocalDate.now();
+        requiredType = new SimpleTypeImpl("http://www.omg.org/spec/DMN/20180521/FEEL/",
+                                                  "date",
+                                                  null,
+                                                  false,
+                                                  null,
+                                                  null,
+                                                  BuiltInType.DATE);
+        retrieved = DMNContextEvaluator.optionallyConvertDateToDateTime(value, requiredType);
+        assertNotNull(retrieved);
+        assertEquals(value, retrieved);
+    }
+
+    @Test
+    public void  dateToDateTime() {
+        File file = FileUtils.getFile("0007-date-time.dmn");
+        final DMNRuntime runtime = DMNRuntimeUtil.createRuntime(file);
+        final DMNModel dmnModel = runtime.getModel("http://www.trisotech.com/definitions/_69430b3e-17b8-430d-b760-c505bf6469f9", "dateTime Table 58");
+        assertThat(dmnModel).isNotNull();
+        assertThat(dmnModel.hasErrors()).as(DMNRuntimeUtil.formatMessages(dmnModel.getMessages())).isFalse();
+
+        DecisionNode date = dmnModel.getDecisionByName("Date");
+        DMNContextEvaluator.ContextEntryDef ed = ((DMNContextEvaluator) ((DecisionNodeImpl) date).getEvaluator()).getEntries().stream()
+                .filter(entry -> entry.getName().equals("fromStringToDateTime"))
+                .findFirst()
+                .orElseThrow(() -> new RuntimeException("Failed to find fromStringToDateTime ContextEntryDef"));
+        final DMNContext context = DMNFactory.newContext();
+        context.set( "dateString", "2015-12-24" );
+        context.set( "timeString", "00:00:01-01:00" );
+        context.set( "dateTimeString", "2016-12-24T23:59:00-05:00" );
+        context.set( "Hours", 12 );
+        context.set( "Minutes", 59 );
+        context.set( "Seconds", new BigDecimal("1.3" ) );
+        context.set( "Timezone", "PT-1H" );
+        context.set( "Year", 1999 );
+        context.set( "Month", 11 );
+        context.set( "Day", 22 );
+        context.set( "durationString", "P13DT2H14S" );      // <variable name="durationString" typeRef="feel:string"/>
+        DMNResultImpl result = createResult(dmnModel, context );
+        DMNExpressionEvaluator evaluator = ed.getEvaluator();
+        EvaluatorResult evaluated = evaluator.evaluate(runtime, result);
+        assertNotNull(evaluated);
+        Object retrieved = evaluated.getResult();
+        assertNotNull(retrieved);
+        assertThat(retrieved instanceof LocalDateTime);
+        //ed.getEvaluator().evaluate( runtime, result );
+        //contextEntryDef.getEvaluator().evaluate()
+
+        // DMNExpressionEvaluator evaluator =
+       // new DMNContextEvaluator.ContextEntryDef("fromStringToDateTime",
+        // type, evaluator, ce )
+    }
+
+    private DMNResultImpl createResult(DMNModel model, DMNContext context) {
+        DMNResultImpl result = createResultImpl(model, context);
+
+        for (DecisionNode decision : model.getDecisions().stream().filter(d -> d.getModelNamespace().equals(model.getNamespace())).collect(Collectors.toSet())) {
+            result.addDecisionResult(new DMNDecisionResultImpl(decision.getId(), decision.getName()));
+        }
+        return result;
+    }
+
+    private DMNResultImpl createResultImpl(DMNModel model, DMNContext context) {
+        DMNResultImpl result = dmnResultFactory.newDMNResultImpl(model);
+        result.setContext(context.clone()); // DMNContextFPAImpl.clone() creates DMNContextImpl
+        return result;
+    }
+}

kie-dmn/kie-dmn-core/src/test/java/org/kie/dmn/core/util/DMNRuntimeUtil.java

@@ -18,6 +18,7 @@
  */
 package org.kie.dmn.core.util;
 
+import java.io.File;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.UUID;
@@ -72,10 +73,15 @@ public static DMNRuntime createRuntime(final String resourceName, final Class te
         final KieContainer kieContainer = KieHelper.getKieContainer(
                 ks.newReleaseId("org.kie", "dmn-test-"+UUID.randomUUID(), "1.0"),
                 ks.getResources().newClassPathResource(resourceName, testClass));
+        return createRuntime(kieContainer);
+    }
 
-        final DMNRuntime runtime = typeSafeGetKieRuntime(kieContainer);
-        assertThat(runtime).isNotNull();
-        return runtime;
+    public static DMNRuntime createRuntime(final File resourceFile) {
+        final KieServices ks = KieServices.Factory.get();
+        final KieContainer kieContainer = KieHelper.getKieContainer(
+                ks.newReleaseId("org.kie", "dmn-test-"+UUID.randomUUID(), "1.0"),
+                ks.getResources().newFileSystemResource(resourceFile));
+        return createRuntime(kieContainer);
     }
 
     public static List<DMNMessage> createExpectingDMNMessages(final String resourceName, final Class testClass) {
@@ -192,4 +198,10 @@ public static byte[] createJarIgnoringErrors(KieServices ks, ReleaseId releaseId
         byte[] jar = kieModule.getBytes();
         return jar;
     }
+
+    static DMNRuntime createRuntime(KieContainer kieContainer) {
+        final DMNRuntime runtime = typeSafeGetKieRuntime(kieContainer);
+        assertThat(runtime).isNotNull();
+        return runtime;
+    }
 }

kie-dmn/kie-dmn-core/src/test/resources/org/kie/dmn/core/0007-date-time.dmn

@@ -72,6 +72,12 @@
                <semantic:text>date(dateString)</semantic:text>
             </semantic:literalExpression>
          </semantic:contextEntry>
+        <semantic:contextEntry>
+          <semantic:variable name="fromStringToDateTime" typeRef="date and time"/>
+          <semantic:literalExpression>
+            <semantic:text>date(dateString)</semantic:text>
+          </semantic:literalExpression>
+        </semantic:contextEntry>
          <semantic:contextEntry>
             <semantic:variable name="fromDateTime" typeRef="date"/>
             <semantic:literalExpression>