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A Java library for transforming Google Transit Feed Spec feeds
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/**
 * Copyright (C) 2012 Google, Inc.
 *
 * 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.
 */
package org.onebusaway.gtfs_transformer.deferred;

import java.util.HashMap;
import java.util.Map;

import org.onebusaway.csv_entities.schema.EntitySchema;
import org.onebusaway.csv_entities.schema.EntitySchemaFactory;
import org.onebusaway.csv_entities.schema.FieldMapping;
import org.onebusaway.csv_entities.schema.SingleFieldMapping;
import org.onebusaway.gtfs.serialization.GtfsReader;

public class EntitySchemaCache {

  private Map _entitySchemasByFileName = new HashMap();

  private Map, EntitySchema> _entitySchemasByEntityType = new HashMap, EntitySchema>();

  private Map, Map> _mappingsByTypeAndCsvFieldName = new HashMap, Map>();

  private Map, Map> _mappingsByTypeAndObjectFieldName = new HashMap, Map>();

  public void addEntitySchemasFromGtfsReader(GtfsReader reader) {
    EntitySchemaFactory factory = reader.getEntitySchemaFactory();
    for (Class entityType : reader.getEntityClasses()) {
      EntitySchema schema = factory.getSchema(entityType);
      addEntitySchema(schema);
    }
  }

  public void addEntitySchema(EntitySchema schema) {
    _entitySchemasByEntityType.put(schema.getEntityClass(), schema);
    if (schema.getFilename() != null) {
      _entitySchemasByFileName.put(schema.getFilename(), schema);
    }
    for (FieldMapping mapping : schema.getFields()) {
      if (mapping instanceof SingleFieldMapping) {
        SingleFieldMapping single = (SingleFieldMapping) mapping;
        putMappingForEntityTypeAndName(_mappingsByTypeAndCsvFieldName,
            schema.getEntityClass(), single.getCsvFieldName(), single);
        putMappingForEntityTypeAndName(_mappingsByTypeAndObjectFieldName,
            schema.getEntityClass(), single.getObjFieldName(), single);
      }
    }
  }

  public SingleFieldMapping getFieldMappingForCsvFieldName(Class entityType,
      String csvFieldName) {
    Map mappings = _mappingsByTypeAndCsvFieldName.get(entityType);
    if (mappings == null) {
      return null;
    }
    return mappings.get(csvFieldName);
  }

  public SingleFieldMapping getFieldMappingForObjectFieldName(
      Class entityType, String objFieldName) {
    Map mappings = _mappingsByTypeAndObjectFieldName.get(entityType);
    if (mappings == null) {
      return null;
    }
    return mappings.get(objFieldName);
  }

  public EntitySchema getSchemaForFileName(String fileName) {
    return _entitySchemasByFileName.get(fileName);
  }

  public EntitySchema getSchemaForEntityType(Class entityType) {
    return _entitySchemasByEntityType.get(entityType);
  }

  private static void putMappingForEntityTypeAndName(
      Map, Map> mappingsByEntityType,
      Class entityType, String name, SingleFieldMapping mapping) {
    Map mappings = mappingsByEntityType.get(entityType);
    if (mappings == null) {
      mappings = new HashMap();
      mappingsByEntityType.put(entityType, mappings);
    }
    mappings.put(name, mapping);
  }
}