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Adding support for BKM and refactoring expression evaluator
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59 changes: 59 additions & 0 deletions
59
kie-dmn/kie-dmn-core/src/main/java/org/kie/dmn/core/ast/BusinessKnowledgeModelNode.java
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| /* | ||
| * Copyright 2016 Red Hat, Inc. and/or its affiliates. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
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| package org.kie.dmn.core.ast; | ||
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| import org.kie.dmn.core.api.DMNType; | ||
| import org.kie.dmn.feel.model.v1_1.BusinessKnowledgeModel; | ||
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| public class BusinessKnowledgeModelNode | ||
| extends DMNBaseNode | ||
| implements DMNNode { | ||
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| private BusinessKnowledgeModel bkm; | ||
| private DMNExpressionEvaluator evaluator; | ||
| private DMNType resultType; | ||
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| public BusinessKnowledgeModelNode() { | ||
| } | ||
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| public BusinessKnowledgeModelNode(BusinessKnowledgeModel bkm, DMNType resultType) { | ||
| super( bkm ); | ||
| this.bkm = bkm; | ||
| this.resultType = resultType; | ||
| } | ||
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| public BusinessKnowledgeModel getBusinessKnowledModel() { | ||
| return bkm; | ||
| } | ||
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| public void setBusinessKnowledgeModel(BusinessKnowledgeModel bkm) { | ||
| this.bkm = bkm; | ||
| } | ||
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| public DMNExpressionEvaluator getEvaluator() { | ||
| return evaluator; | ||
| } | ||
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| public void setEvaluator(DMNExpressionEvaluator evaluator) { | ||
| this.evaluator = evaluator; | ||
| } | ||
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| public DMNType getResultType() { | ||
| return resultType; | ||
| } | ||
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| } |
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97
kie-dmn/kie-dmn-core/src/main/java/org/kie/dmn/core/ast/DMNDTExpressionEvaluator.java
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| /* | ||
| * Copyright 2016 Red Hat, Inc. and/or its affiliates. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
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| package org.kie.dmn.core.ast; | ||
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| import org.kie.dmn.core.api.DMNMessage; | ||
| import org.kie.dmn.core.api.event.InternalDMNRuntimeEventManager; | ||
| import org.kie.dmn.core.impl.DMNResultImpl; | ||
| import org.kie.dmn.feel.FEEL; | ||
| import org.kie.dmn.feel.lang.impl.EvaluationContextImpl; | ||
| import org.kie.dmn.feel.lang.impl.FEELImpl; | ||
| import org.kie.dmn.feel.runtime.events.DecisionTableRulesMatchedEvent; | ||
| import org.kie.dmn.feel.runtime.events.FEELEvent; | ||
| import org.kie.dmn.feel.runtime.events.FEELEventListener; | ||
| import org.kie.dmn.feel.runtime.functions.DTInvokerFunction; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
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| /** | ||
| * An evaluator for DMN Decision Table Expressions | ||
| */ | ||
| public class DMNDTExpressionEvaluator | ||
| implements DMNExpressionEvaluator, FEELEventListener { | ||
| private final DMNNode node; | ||
| private DTInvokerFunction dt; | ||
| private FEELImpl feel; | ||
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| private List<FEELEvent> events = new ArrayList<>(); | ||
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| public DMNDTExpressionEvaluator(DMNNode node, DTInvokerFunction dt) { | ||
| this.node = node; | ||
| this.dt = dt; | ||
| feel = (FEELImpl) FEEL.newInstance(); | ||
| feel.addListener( this ); | ||
| } | ||
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| @Override | ||
| public EvaluatorResult evaluate(InternalDMNRuntimeEventManager eventManager, DMNResultImpl result) { | ||
| EventResults r = null; | ||
| try { | ||
| eventManager.fireBeforeEvaluateDecisionTable( dt.getName(), result ); | ||
| List<String> paramNames = dt.getParameterNames().get( 0 ); | ||
| Object[] params = new Object[paramNames.size()]; | ||
| EvaluationContextImpl ctx = new EvaluationContextImpl( feel.getEventsManager() ); | ||
| for ( int i = 0; i < params.length; i++ ) { | ||
| params[i] = feel.evaluate( paramNames.get( i ), result.getContext().getAll() ); | ||
| ctx.setValue( paramNames.get( i ), params[i] ); | ||
| } | ||
| Object dtr = dt.apply( ctx, params ); | ||
| r = processEvents( events, eventManager, result ); | ||
| return new EvaluatorResult( dtr, r.hasErrors ? ResultType.FAILURE : ResultType.SUCCESS ); | ||
| } finally { | ||
| eventManager.fireAfterEvaluateDecisionTable( dt.getName(), result, (r != null ? r.matchedRules : null) ); | ||
| } | ||
| } | ||
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| private EventResults processEvents(List<FEELEvent> events, InternalDMNRuntimeEventManager eventManager, DMNResultImpl result) { | ||
| EventResults r = new EventResults(); | ||
| for ( FEELEvent e : events ) { | ||
| if ( e instanceof DecisionTableRulesMatchedEvent ) { | ||
| r.matchedRules = ((DecisionTableRulesMatchedEvent) e).getMatches(); | ||
| } else if ( e.getSeverity() == FEELEvent.Severity.ERROR ) { | ||
| result.addMessage( DMNMessage.Severity.ERROR, e.getMessage(), node.getId(), e ); | ||
| r.hasErrors = true; | ||
| } | ||
| } | ||
| events.clear(); | ||
| if ( r.matchedRules.isEmpty() ) { | ||
| r.hasErrors = true; | ||
| } | ||
| return r; | ||
| } | ||
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| private static class EventResults { | ||
| public boolean hasErrors = false; | ||
| public List<Integer> matchedRules; | ||
| } | ||
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| @Override | ||
| public void onEvent(FEELEvent event) { | ||
| this.events.add( event ); | ||
| } | ||
| } |
58 changes: 58 additions & 0 deletions
58
kie-dmn/kie-dmn-core/src/main/java/org/kie/dmn/core/ast/DMNExpressionEvaluator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| /* | ||
| * Copyright 2016 Red Hat, Inc. and/or its affiliates. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
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| package org.kie.dmn.core.ast; | ||
|
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| import org.kie.dmn.core.api.event.InternalDMNRuntimeEventManager; | ||
| import org.kie.dmn.core.impl.DMNResultImpl; | ||
|
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| /** | ||
| * An Expression Evaluator interface for DMN defined expressions | ||
| */ | ||
| public interface DMNExpressionEvaluator { | ||
| /** | ||
| * Evaluates the expression, returning its result type (SUCCESS/FAILURE) and | ||
| * result value. | ||
| * | ||
| * @param eventManager events manager to whom events are notified | ||
| * @param result the result context instance | ||
| * | ||
| * @return the result of the evaluation of the expression | ||
| */ | ||
| EvaluatorResult evaluate(InternalDMNRuntimeEventManager eventManager, DMNResultImpl result); | ||
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| enum ResultType { | ||
| SUCCESS, FAILURE; | ||
| } | ||
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| class EvaluatorResult { | ||
| private final Object result; | ||
| private final ResultType code; | ||
|
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| public EvaluatorResult(Object result, ResultType code) { | ||
| this.result = result; | ||
| this.code = code; | ||
| } | ||
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| public Object getResult() { | ||
| return result; | ||
| } | ||
|
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| public ResultType getResultType() { | ||
| return code; | ||
| } | ||
| } | ||
| } |
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