[MPS-28688] add findOutputNodeByComparableInputNodeAndMappingName

(cherry picked from commit eab0990) from pull request JetBrains#33 [MPS-28688] on github

Author: Kemal Soysal

core/generator/source/jetbrains/mps/generator/impl/AbstractTemplateGenerator.java

@@ -24,6 +24,7 @@
 import jetbrains.mps.generator.runtime.TemplateContext;
 import jetbrains.mps.generator.template.ITemplateGenerator;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 import org.jetbrains.mps.openapi.language.SContainmentLink;
 import org.jetbrains.mps.openapi.language.SReferenceLink;
 import org.jetbrains.mps.openapi.model.SModel;
@@ -103,6 +104,20 @@ public void registerMappingLabel(SNode inputNode, String mappingName, SNode outp
   public SNode findOutputNodeByTemplateNodeUnique(String templateNode) {
     return myMappings.findOutputNodeByTemplateNodeUnique(templateNode);
   }
+  /**
+   * For the mapping label the comparable decides if the key is in the keySet.
+   * If so, the key will be used to return the value.
+   * This is specially useful if the comparable might be equivalent to a search key,
+   * which is produced on demand
+   * @param comparable
+   * @param mappingName
+   * @return output if the key could be found with the help of the comparator
+   */
+  @Nullable
+  @Override
+  public SNode findOutputNodeByComparableInputNodeAndMappingName(@NotNull Comparable<SNode> comparable, @Nullable String mappingName){
+    return myMappings.findOutputNodeByComparableInputNodeAndMappingName(comparable, mappingName);
+  }
 
   @Override
   public SNode findOutputNodeByInputNodeAndMappingName(SNode inputNode, String mappingName) {

core/generator/source/jetbrains/mps/generator/impl/BogusTemplateGenerator.java

@@ -73,6 +73,12 @@ public void registerMappingLabel(SNode inputNode, String mappingName, SNode outp
     throw new UnsupportedOperationException();
   }
 
+  @Nullable
+  @Override
+  public SNode findOutputNodeByComparableInputNodeAndMappingName(@NotNull Comparable<SNode> comparable, @Nullable String mappingName) {
+    return null;
+  }
+
   @Nullable
   @Override
   public SNode findOutputNodeByInputNodeAndMappingName(SNode inputNode, @Nullable String mappingName) {

core/generator/source/jetbrains/mps/generator/impl/GeneratorMappings.java

@@ -35,6 +35,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
+import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
@@ -192,6 +193,27 @@ public SNode findOutputNodeByInputNodeAndMappingName(@Nullable SNode inputNode,
     return (SNode) o;
   }
 
+  /**
+   * For the mapping label the comparable decides if the key is in the keySet.
+   * If so, the key will be used to return the value.
+   * This is specially useful if the comparable might be equivalent to a search key,
+   * which is produced on demand
+   * @param comparable
+   * @param mappingName
+   * @return output if the key could be found with the help of the comparator
+   */
+  public SNode findOutputNodeByComparableInputNodeAndMappingName(@NotNull Comparable<SNode> comparable, @Nullable String mappingName){
+    Map<SNode, Object> currentMapping = myMappingNameAndInputNodeToOutputNodeMap.get(mappingName);
+    if (currentMapping == null) {
+      return null;
+    }
+    Optional<SNode> foundInput = currentMapping.keySet().parallelStream().filter(labeledOne -> comparable.compareTo(labeledOne)==0).findFirst();
+    if(foundInput.isPresent()){
+      return (SNode) currentMapping.get(foundInput.get());
+    }
+    return null;
+  }
+
   public List<SNode> findAllOutputNodesByInputNodeAndMappingName(SNode inputNode, String mappingName) {
     if (mappingName == null) {
       return null;

core/generator/source/jetbrains/mps/generator/template/ITemplateGenerator.java

@@ -19,6 +19,7 @@
 import jetbrains.mps.generator.IGeneratorLogger;
 import jetbrains.mps.generator.impl.query.GeneratorQueryProvider;
 import jetbrains.mps.util.annotation.ToRemove;
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.mps.openapi.model.SModel;
 import org.jetbrains.mps.openapi.model.SNode;
@@ -42,6 +43,18 @@ public interface ITemplateGenerator extends GeneratorQueryProvider.Source {
 
   void registerMappingLabel(SNode inputNode, String mappingName, SNode outputNode);
 
+  /**
+   * For the mapping label the comparable decides if the key is in the keySet.
+   * If so, the key will be used to return the value.
+   * This is specially useful if the comparable might be equivalent to a search key,
+   * which is produced on demand
+   * @param comparable
+   * @param mappingName
+   * @return output if the key could be found with the help of the comparator
+   */
+  @Nullable
+  SNode findOutputNodeByComparableInputNodeAndMappingName(@NotNull Comparable<SNode> comparable, @Nullable String mappingName);
+
   /**
    * @param inputNode node from almost any model that may have served as an input for a generator. We tolerate null value now, indicating
    *                  we are looking for conditional root (takes no input to create one)

core/generator/source/jetbrains/mps/generator/template/TemplateQueryContext.java

@@ -119,6 +119,10 @@ public SNode getOutputNodeByMappingLabel(String label, @Nullable SModel inputMod
     return myGenerator.findOutputNode(inputModel, label);
   }
 
+  @Nullable
+  public SNode getOutputNodeByComparableInputNodeAndMappingLabel(@NotNull Comparable<SNode> inputNode, @NotNull String label) {
+    return myGenerator.findOutputNodeByComparableInputNodeAndMappingName(inputNode, label);
+  }
   public SNode getOutputNodeByInputNodeAndMappingLabel(SNode inputNode, String label) {
     if (inputNode == null) return null;
     if (!myGenerator.areMappingsAvailable()) {