content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.
   */
  
  package org.apache.atlas.query;
  
  import org.apache.atlas.exception.AtlasBaseException;
  import org.apache.atlas.model.TypeCategory;
  import org.apache.atlas.model.typedef.AtlasBaseTypeDef;
  import org.apache.atlas.type.AtlasArrayType;
  import org.apache.atlas.type.AtlasBuiltInTypes;
  import org.apache.atlas.type.AtlasClassificationType;
  import org.apache.atlas.type.AtlasEntityType;
  import org.apache.atlas.type.AtlasMapType;
  import org.apache.atlas.type.AtlasStructType;
  import org.apache.atlas.type.AtlasStructType.AtlasAttribute.AtlasRelationshipEdgeDirection;
  import org.apache.atlas.type.AtlasType;
  import org.apache.atlas.type.AtlasTypeRegistry;
  import org.apache.commons.lang.StringUtils;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import static org.apache.atlas.discovery.SearchContext.MATCH_ALL_CLASSIFIED;
  import static org.apache.atlas.discovery.SearchContext.MATCH_ALL_ENTITY_TYPES;
  import static org.apache.atlas.discovery.SearchContext.MATCH_ALL_NOT_CLASSIFIED;
  import static org.apache.atlas.model.discovery.SearchParameters.ALL_CLASSIFICATIONS;
  import static org.apache.atlas.model.discovery.SearchParameters.ALL_ENTITY_TYPES;
  import static org.apache.atlas.model.discovery.SearchParameters.NO_CLASSIFICATIONS;
  
  class RegistryBasedLookup implements Lookup {
      private static final Map<String, String> NUMERIC_ATTRIBUTES = new HashMap<>();
  
      static {
          NUMERIC_ATTRIBUTES.put(AtlasBaseTypeDef.ATLAS_TYPE_BYTE, "");
          NUMERIC_ATTRIBUTES.put(AtlasBaseTypeDef.ATLAS_TYPE_SHORT, "");
          NUMERIC_ATTRIBUTES.put(AtlasBaseTypeDef.ATLAS_TYPE_INT, "");
          NUMERIC_ATTRIBUTES.put(AtlasBaseTypeDef.ATLAS_TYPE_LONG, "L");
          NUMERIC_ATTRIBUTES.put(AtlasBaseTypeDef.ATLAS_TYPE_FLOAT, "f");
          NUMERIC_ATTRIBUTES.put(AtlasBaseTypeDef.ATLAS_TYPE_DOUBLE, "d");
          NUMERIC_ATTRIBUTES.put(AtlasBaseTypeDef.ATLAS_TYPE_BIGINTEGER, "");
          NUMERIC_ATTRIBUTES.put(AtlasBaseTypeDef.ATLAS_TYPE_BIGDECIMAL, "");
      }
  
      private final AtlasTypeRegistry typeRegistry;
  
      public RegistryBasedLookup(AtlasTypeRegistry typeRegistry) {
          this.typeRegistry = typeRegistry;
      }
  
      @Override
      public AtlasType getType(String typeName) throws AtlasBaseException {
          AtlasType ret;
  
          switch (typeName) {
              case ALL_CLASSIFICATIONS:
                  ret = MATCH_ALL_CLASSIFIED;
                  break;
              case NO_CLASSIFICATIONS:
                  ret = MATCH_ALL_NOT_CLASSIFIED;
                  break;
              case ALL_ENTITY_TYPES:
                  ret = MATCH_ALL_ENTITY_TYPES;
                  break;
              default:
                  ret = typeRegistry.getType(typeName);
                  break;
          }
  
          return ret;
      }
  
      @Override
      public String getQualifiedName(GremlinQueryComposer.Context context, String name) throws AtlasBaseException {
          AtlasStructType et = context.getActiveEntityType();
  
          if (et == null && isClassificationType(context)) {
              et = (AtlasClassificationType) context.getActiveType();
          }
  
          if (et == null) {
              return "";
          }
  
          return et.getVertexPropertyName(name);
      }
  
      @Override
      public boolean isPrimitive(GremlinQueryComposer.Context context, String attributeName) {
          AtlasStructType et = context.getActiveEntityType();
  
          if (et == null && isClassificationType(context)) {
              et = (AtlasClassificationType) context.getActiveType();
          }
  
          if (et == null) {
              return false;
          }
  
          AtlasType at = getAttributeType(et, attributeName);
  
          if (at == null) {
              return false;
          }
  
          TypeCategory tc = at.getTypeCategory();
  
          if (isPrimitiveUsingTypeCategory(tc)) {
              return true;
          }
  
          if (tc == TypeCategory.ARRAY) {
              AtlasArrayType ct = ((AtlasArrayType) at);
  
              return isPrimitiveUsingTypeCategory(ct.getElementType().getTypeCategory());
          }
  
          if (tc == TypeCategory.MAP) {
              AtlasMapType ct = ((AtlasMapType) at);
  
              return isPrimitiveUsingTypeCategory(ct.getValueType().getTypeCategory());
          }
  
          return false;
      }
  
      @Override
      public String getRelationshipEdgeLabel(GremlinQueryComposer.Context context, String attributeName) {
          AtlasEntityType et = context.getActiveEntityType();
  
          if (et == null) {
              return "";
          }
  
          AtlasStructType.AtlasAttribute attr = getAttribute(et, attributeName);
  
          return (attr != null) ? attr.getRelationshipEdgeLabel() : "";
      }
  
      @Override
      public AtlasRelationshipEdgeDirection getRelationshipEdgeDirection(GremlinQueryComposer.Context context, String attributeName) {
          AtlasEntityType                entityType = context.getActiveEntityType();
          AtlasRelationshipEdgeDirection ret        = null;
  
          if (entityType != null) {
              AtlasStructType.AtlasAttribute attribute = entityType.getRelationshipAttribute(attributeName, null);
  
              if (attribute != null) {
                  ret = attribute.getRelationshipEdgeDirection();
              }
          }
  
          return ret;
      }
  
      @Override
      public boolean hasAttribute(GremlinQueryComposer.Context context, String typeName) {
          AtlasStructType type = context.getActiveEntityType();
  
          if (type == null && isClassificationType(context)) {
              type = (AtlasClassificationType) context.getActiveType();
          }
  
          return getAttribute(type, typeName) != null;
      }
  
      @Override
      public boolean doesTypeHaveSubTypes(GremlinQueryComposer.Context context) {
          return (context.getActiveEntityType() != null && !context.getActiveEntityType().getAllSubTypes().isEmpty());
      }
  
      @Override
      public String getTypeAndSubTypes(GremlinQueryComposer.Context context) {
          String[] str = context.getActiveEntityType() != null ? context.getActiveEntityType().getTypeAndAllSubTypes().toArray(new String[] {}) : new String[] {};
  
          if (str.length == 0) {
              return null;
          }
  
          String[] quoted = new String[str.length];
  
          for (int i = 0; i < str.length; i++) {
              quoted[i] = IdentifierHelper.getQuoted(str[i]);
          }
  
          return StringUtils.join(quoted, ",");
      }
  
      @Override
      public boolean isTraitType(String typeName) {
          try {
              AtlasType t;
  
              if (typeName.equalsIgnoreCase(ALL_CLASSIFICATIONS)) {
                  t = MATCH_ALL_CLASSIFIED;
              } else if (typeName.equalsIgnoreCase(NO_CLASSIFICATIONS)) {
                  t = MATCH_ALL_NOT_CLASSIFIED;
              } else if (typeName.equalsIgnoreCase(ALL_ENTITY_TYPES)) {
                  t = MATCH_ALL_ENTITY_TYPES;
              } else {
                  t = typeRegistry.getType(typeName);
              }
  
              return isTraitType(t);
          } catch (AtlasBaseException e) {
              return false;
          }
      }
  
      @Override
      public String getTypeFromEdge(GremlinQueryComposer.Context context, String item) {
          AtlasEntityType et = context.getActiveEntityType();
  
          if (et == null) {
              return "";
          }
  
          AtlasStructType.AtlasAttribute attr = getAttribute(et, item);
  
          if (attr == null) {
              return null;
          }
  
          AtlasType at = attr.getAttributeType();
  
          switch (at.getTypeCategory()) {
              case ARRAY:
                  AtlasArrayType arrType = ((AtlasArrayType) at);
  
                  return getCollectionElementType(arrType.getElementType());
  
              case MAP:
                  AtlasMapType mapType = ((AtlasMapType) at);
  
                  return getCollectionElementType(mapType.getValueType());
          }
  
          return getAttribute(context.getActiveEntityType(), item).getTypeName();
      }
  
      @Override
      public boolean isDate(GremlinQueryComposer.Context context, String attributeName) {
          AtlasEntityType et = context.getActiveEntityType();
  
          if (et == null) {
              return false;
          }
  
          AtlasType attr = getAttributeType(et, attributeName);
  
          return attr != null && attr.getTypeName().equals(AtlasBaseTypeDef.ATLAS_TYPE_DATE);
      }
  
      @Override
      public boolean isNumeric(GremlinQueryComposer.Context context, String attrName) {
          AtlasEntityType et = context.getActiveEntityType();
  
          if (et == null) {
              return false;
          }
  
          AtlasType attr = getAttributeType(et, attrName);
          boolean   ret  = attr != null && NUMERIC_ATTRIBUTES.containsKey(attr.getTypeName());
  
          if (ret) {
              context.setNumericTypeFormatter(NUMERIC_ATTRIBUTES.get(attr.getTypeName()));
          }
  
          return ret;
      }
  
      @Override
      public String getVertexPropertyName(String typeName, String attrName) {
          AtlasEntityType entityType = typeRegistry.getEntityTypeByName(typeName);
  
          if (entityType == null && StringUtils.equals(typeName, ALL_ENTITY_TYPES)) {
              entityType = MATCH_ALL_ENTITY_TYPES;
          }
  
          AtlasStructType.AtlasAttribute attribute = getAttribute(entityType, attrName);
  
          if (attribute == null) {
              return null;
          }
  
          return attribute.getVertexPropertyName();
      }
  
      private boolean isPrimitiveUsingTypeCategory(TypeCategory tc) {
          return (tc == TypeCategory.PRIMITIVE || tc == TypeCategory.ENUM);
      }
  
      private boolean isTraitType(AtlasType t) {
          return (t != null && t.getTypeCategory() == TypeCategory.CLASSIFICATION);
      }
  
      private String getCollectionElementType(AtlasType elemType) {
          if (elemType.getTypeCategory() == TypeCategory.OBJECT_ID_TYPE) {
              return ((AtlasBuiltInTypes.AtlasObjectIdType) elemType).getObjectType();
          } else {
              return elemType.getTypeName();
          }
      }
  
      private AtlasStructType.AtlasAttribute getAttribute(AtlasStructType type, String attrName) {
          if (type == null) {
              return null;
          } else if (type instanceof AtlasEntityType) {
              AtlasEntityType entityType = (AtlasEntityType) type;
  
              AtlasStructType.AtlasAttribute ret = entityType.getAttribute(attrName);
  
              if (ret == null) {
                  ret = entityType.getRelationshipAttribute(attrName, null);
              }
  
              return ret;
          } else if (type instanceof AtlasClassificationType) {
              AtlasClassificationType classificationType = (AtlasClassificationType) type;
  
              return classificationType.getAttribute(attrName);
          }
  
          return null;
      }
  
      private AtlasType getAttributeType(AtlasStructType entityType, String attrName) {
          AtlasStructType.AtlasAttribute attribute = getAttribute(entityType, attrName);
  
          return attribute != null ? attribute.getAttributeType() : null;
      }
  
      private boolean isClassificationType(GremlinQueryComposer.Context context) {
          return context.getActiveType() instanceof AtlasClassificationType;
      }
  }
  