feat: enable Basic var and List var to coexist for the local search

benchmark/src/main/resources/benchmark.xsd

@@ -674,7 +674,7 @@
           <xs:element minOccurs="0" name="valueSorterManner" type="tns:valueSorterManner"/>
 
 
-          <xs:choice maxOccurs="unbounded" minOccurs="0">
+          <xs:choice minOccurs="0">
 
 
             <xs:element name="queuedEntityPlacer" type="tns:queuedEntityPlacerConfig"/>

core/src/main/java/ai/timefold/solver/core/config/constructionheuristic/ConstructionHeuristicPhaseConfig.java

@@ -1,6 +1,5 @@
 package ai.timefold.solver.core.config.constructionheuristic;
 
-import java.util.Arrays;
 import java.util.List;
 import java.util.function.Consumer;
 
@@ -37,7 +36,7 @@
         "constructionHeuristicType",
         "entitySorterManner",
         "valueSorterManner",
-        "entityPlacerConfigList",
+        "entityPlacerConfig",
         "moveSelectorConfigList",
         "foragerConfig"
 })
@@ -57,9 +56,9 @@ public class ConstructionHeuristicPhaseConfig extends PhaseConfig<ConstructionHe
             @XmlElement(name = "queuedValuePlacer", type = QueuedValuePlacerConfig.class),
             @XmlElement(name = "pooledEntityPlacer", type = PooledEntityPlacerConfig.class)
     })
-    protected List<EntityPlacerConfig> entityPlacerConfigList = null;
+    protected EntityPlacerConfig entityPlacerConfig = null;
 
-    /** Simpler alternative for {@link #entityPlacerConfigList}. */
+    /** Simpler alternative for {@link #entityPlacerConfig}. */
     @XmlElements({
             @XmlElement(name = CartesianProductMoveSelectorConfig.XML_ELEMENT_NAME,
                     type = CartesianProductMoveSelectorConfig.class),
@@ -111,35 +110,12 @@ public void setValueSorterManner(@Nullable ValueSorterManner valueSorterManner)
         this.valueSorterManner = valueSorterManner;
     }
 
-    public List<EntityPlacerConfig> getEntityPlacerConfigList() {
-        return entityPlacerConfigList;
-    }
-
-    public void setEntityPlacerConfigList(List<EntityPlacerConfig> entityPlacerConfigList) {
-        this.entityPlacerConfigList = entityPlacerConfigList;
+    public @Nullable EntityPlacerConfig getEntityPlacerConfig() {
+        return entityPlacerConfig;
     }
 
-    /**
-     * @deprecated Use {@link #setEntityPlacerConfigList(List)}} instead.
-     */
-    @Deprecated(forRemoval = true, since = "1.22.0")
-    public void setEntityPlacerConfig(EntityPlacerConfig entityPlacerConfig) {
-        setEntityPlacerConfigList(List.of(entityPlacerConfig));
-    }
-
-    /**
-     * @deprecated Use {@link #getEntityPlacerConfigList()} instead.
-     */
-    @Deprecated(forRemoval = true, since = "1.22.0")
-    public @Nullable EntityPlacerConfig getEntityPlacerConfig() {
-        if (entityPlacerConfigList == null || entityPlacerConfigList.isEmpty()) {
-            return null;
-        }
-        if (entityPlacerConfigList.size() > 1) {
-            throw new IllegalStateException(
-                    "Returning a single entity placer configuration is not possible. Maybe use getEntityPlacerConfigList instead.");
-        }
-        return entityPlacerConfigList.get(0);
+    public void setEntityPlacerConfig(@Nullable EntityPlacerConfig entityPlacerConfig) {
+        this.entityPlacerConfig = entityPlacerConfig;
     }
 
     public @Nullable List<@NonNull MoveSelectorConfig> getMoveSelectorConfigList() {
@@ -178,19 +154,8 @@ public void setForagerConfig(@Nullable ConstructionHeuristicForagerConfig forage
         return this;
     }
 
-    public @NonNull ConstructionHeuristicPhaseConfig
-            withEntityPlacerConfigList(@NonNull EntityPlacerConfig<?>... entityPlacerConfig) {
-        setEntityPlacerConfigList(Arrays.asList(entityPlacerConfig));
-        return this;
-    }
-
-    /**
-     * @deprecated use {@link #withEntityPlacerConfigList(EntityPlacerConfig[])} instead.
-     */
-    @Deprecated(forRemoval = true, since = "1.22.0")
-    public @NonNull ConstructionHeuristicPhaseConfig
-            withEntityPlacerConfig(@NonNull EntityPlacerConfig entityPlacerConfig) {
-        setEntityPlacerConfigList(List.of(entityPlacerConfig));
+    public @NonNull ConstructionHeuristicPhaseConfig withEntityPlacerConfig(@NonNull EntityPlacerConfig<?> entityPlacerConfig) {
+        this.entityPlacerConfig = entityPlacerConfig;
         return this;
     }
 
@@ -215,8 +180,8 @@ public void setForagerConfig(@Nullable ConstructionHeuristicForagerConfig forage
                 inheritedConfig.getEntitySorterManner());
         valueSorterManner = ConfigUtils.inheritOverwritableProperty(valueSorterManner,
                 inheritedConfig.getValueSorterManner());
-        entityPlacerConfigList = ConfigUtils.inheritMergeableListConfig(
-                entityPlacerConfigList, inheritedConfig.getEntityPlacerConfigList());
+        setEntityPlacerConfig(ConfigUtils.inheritOverwritableProperty(
+                getEntityPlacerConfig(), inheritedConfig.getEntityPlacerConfig()));
         moveSelectorConfigList = ConfigUtils.inheritMergeableListConfig(
                 moveSelectorConfigList, inheritedConfig.getMoveSelectorConfigList());
         foragerConfig = ConfigUtils.inheritConfig(foragerConfig, inheritedConfig.getForagerConfig());
@@ -233,8 +198,8 @@ public void visitReferencedClasses(@NonNull Consumer<Class<?>> classVisitor) {
         if (terminationConfig != null) {
             terminationConfig.visitReferencedClasses(classVisitor);
         }
-        if (entityPlacerConfigList != null) {
-            entityPlacerConfigList.forEach(entityPlacerConfig -> entityPlacerConfig.visitReferencedClasses(classVisitor));
+        if (entityPlacerConfig != null) {
+            entityPlacerConfig.visitReferencedClasses(classVisitor);
         }
         if (moveSelectorConfigList != null) {
             moveSelectorConfigList.forEach(ms -> ms.visitReferencedClasses(classVisitor));

core/src/main/java/ai/timefold/solver/core/impl/AbstractFromConfigFactory.java

@@ -1,6 +1,5 @@
 package ai.timefold.solver.core.impl;
 
-import java.util.Collection;
 import java.util.List;
 import java.util.Objects;
 
@@ -24,8 +23,8 @@ protected AbstractFromConfigFactory(Config_ config) {
 
     public static <Solution_> EntitySelectorConfig getDefaultEntitySelectorConfigForEntity(
             HeuristicConfigPolicy<Solution_> configPolicy, EntityDescriptor<Solution_> entityDescriptor) {
-        Class<?> entityClass = entityDescriptor.getEntityClass();
-        EntitySelectorConfig entitySelectorConfig = new EntitySelectorConfig()
+        var entityClass = entityDescriptor.getEntityClass();
+        var entitySelectorConfig = new EntitySelectorConfig()
                 .withId(entityClass.getName())
                 .withEntityClass(entityClass);
         return deduceEntitySortManner(configPolicy, entityDescriptor, entitySelectorConfig);
@@ -44,15 +43,15 @@ public static <Solution_> EntitySelectorConfig deduceEntitySortManner(HeuristicC
 
     protected EntityDescriptor<Solution_> deduceEntityDescriptor(HeuristicConfigPolicy<Solution_> configPolicy,
             Class<?> entityClass) {
-        SolutionDescriptor<Solution_> solutionDescriptor = configPolicy.getSolutionDescriptor();
+        var solutionDescriptor = configPolicy.getSolutionDescriptor();
         return entityClass == null
                 ? getTheOnlyEntityDescriptor(solutionDescriptor)
                 : getEntityDescriptorForClass(solutionDescriptor, entityClass);
     }
 
     private EntityDescriptor<Solution_> getEntityDescriptorForClass(SolutionDescriptor<Solution_> solutionDescriptor,
             Class<?> entityClass) {
-        EntityDescriptor<Solution_> entityDescriptor = solutionDescriptor.getEntityDescriptorStrict(entityClass);
+        var entityDescriptor = solutionDescriptor.getEntityDescriptorStrict(entityClass);
         if (entityDescriptor == null) {
             throw new IllegalArgumentException(
                     """
@@ -65,7 +64,7 @@ Check your solver configuration. If that class (%s) is not in the entityClassSet
     }
 
     protected EntityDescriptor<Solution_> getTheOnlyEntityDescriptor(SolutionDescriptor<Solution_> solutionDescriptor) {
-        Collection<EntityDescriptor<Solution_>> entityDescriptors = solutionDescriptor.getGenuineEntityDescriptors();
+        var entityDescriptors = solutionDescriptor.getGenuineEntityDescriptors();
         if (entityDescriptors.size() != 1) {
             throw new IllegalArgumentException(
                     "The config (%s) has no entityClass configured and because there are multiple in the entityClassSet (%s), it cannot be deduced automatically."
@@ -76,7 +75,7 @@ protected EntityDescriptor<Solution_> getTheOnlyEntityDescriptor(SolutionDescrip
 
     protected EntityDescriptor<Solution_>
             getTheOnlyEntityDescriptorWithBasicVariables(SolutionDescriptor<Solution_> solutionDescriptor) {
-        Collection<EntityDescriptor<Solution_>> entityDescriptors = solutionDescriptor.getGenuineEntityDescriptors()
+        var entityDescriptors = solutionDescriptor.getGenuineEntityDescriptors()
                 .stream()
                 .filter(EntityDescriptor::hasAnyGenuineBasicVariables)
                 .toList();
@@ -88,6 +87,20 @@ protected EntityDescriptor<Solution_> getTheOnlyEntityDescriptor(SolutionDescrip
         return entityDescriptors.iterator().next();
     }
 
+    protected EntityDescriptor<Solution_>
+            getTheOnlyEntityDescriptorWithListVariable(SolutionDescriptor<Solution_> solutionDescriptor) {
+        var entityDescriptors = solutionDescriptor.getGenuineEntityDescriptors()
+                .stream()
+                .filter(EntityDescriptor::hasAnyGenuineListVariables)
+                .toList();
+        if (entityDescriptors.size() != 1) {
+            throw new IllegalArgumentException(
+                    "Impossible state: the config (%s) has no entityClass configured and because there are multiple in the entityClassSet (%s), it cannot be deduced automatically."
+                            .formatted(config, solutionDescriptor.getEntityClassSet()));
+        }
+        return entityDescriptors.iterator().next();
+    }
+
     protected GenuineVariableDescriptor<Solution_> deduceGenuineVariableDescriptor(EntityDescriptor<Solution_> entityDescriptor,
             String variableName) {
         return variableName == null
@@ -97,7 +110,7 @@ protected GenuineVariableDescriptor<Solution_> deduceGenuineVariableDescriptor(E
 
     protected GenuineVariableDescriptor<Solution_> getVariableDescriptorForName(EntityDescriptor<Solution_> entityDescriptor,
             String variableName) {
-        GenuineVariableDescriptor<Solution_> variableDescriptor = entityDescriptor.getGenuineVariableDescriptor(variableName);
+        var variableDescriptor = entityDescriptor.getGenuineVariableDescriptor(variableName);
         if (variableDescriptor == null) {
             throw new IllegalArgumentException(
                     """
@@ -109,8 +122,7 @@ The config (%s) has a variableName (%s) which is not a valid planning variable o
     }
 
     protected GenuineVariableDescriptor<Solution_> getTheOnlyVariableDescriptor(EntityDescriptor<Solution_> entityDescriptor) {
-        List<GenuineVariableDescriptor<Solution_>> variableDescriptorList =
-                entityDescriptor.getGenuineVariableDescriptorList();
+        var variableDescriptorList = entityDescriptor.getGenuineVariableDescriptorList();
         if (variableDescriptorList.size() != 1) {
             throw new IllegalArgumentException(
                     "The config (%s) has no configured variableName for entityClass (%s) and because there are multiple variableNames (%s), it cannot be deduced automatically."
@@ -123,8 +135,26 @@ protected GenuineVariableDescriptor<Solution_> getTheOnlyVariableDescriptor(Enti
     protected List<GenuineVariableDescriptor<Solution_>> deduceVariableDescriptorList(
             EntityDescriptor<Solution_> entityDescriptor, List<String> variableNameIncludeList) {
         Objects.requireNonNull(entityDescriptor);
-        List<GenuineVariableDescriptor<Solution_>> variableDescriptorList =
-                entityDescriptor.getGenuineVariableDescriptorList();
+        var variableDescriptorList = entityDescriptor.getGenuineVariableDescriptorList();
+        if (variableNameIncludeList == null) {
+            return variableDescriptorList;
+        }
+
+        return variableNameIncludeList.stream()
+                .map(variableNameInclude -> variableDescriptorList.stream()
+                        .filter(variableDescriptor -> variableDescriptor.getVariableName().equals(variableNameInclude))
+                        .findFirst()
+                        .orElseThrow(() -> new IllegalArgumentException(
+                                "The config (%s) has a variableNameInclude (%s) which does not exist in the entity (%s)'s variableDescriptorList (%s)."
+                                        .formatted(config, variableNameInclude, entityDescriptor.getEntityClass(),
+                                                variableDescriptorList))))
+                .toList();
+    }
+
+    protected List<GenuineVariableDescriptor<Solution_>> deduceBasicVariableDescriptorList(
+            EntityDescriptor<Solution_> entityDescriptor, List<String> variableNameIncludeList) {
+        Objects.requireNonNull(entityDescriptor);
+        var variableDescriptorList = entityDescriptor.getGenuineBasicVariableDescriptorList();
         if (variableNameIncludeList == null) {
             return variableDescriptorList;
         }

core/src/main/java/ai/timefold/solver/core/impl/constructionheuristic/DefaultConstructionHeuristicPhase.java

@@ -57,7 +57,7 @@ public void solve(SolverScope<Solution_> solverScope) {
         phaseStarted(phaseScope);
 
         var solutionDescriptor = solverScope.getSolutionDescriptor();
-        var hasListVariable = solutionDescriptor.hasListVariable();
+        var hasListVariable = moveRepository.hasListVariable();
         var maxStepCount = -1;
         if (hasListVariable) {
             // In case of list variable with support for unassigned values, the placer will iterate indefinitely.