/**
 * 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.repository.store.graph.v2;

import org.apache.atlas.entitytransform.BaseEntityHandler;
import org.apache.atlas.exception.AtlasBaseException;
import org.apache.atlas.model.impexp.AtlasExportResult;
import org.apache.atlas.model.instance.AtlasEntity;
import org.apache.atlas.model.instance.AtlasEntity.AtlasEntityWithExtInfo;
import org.apache.atlas.model.typedef.AtlasTypesDef;
import org.apache.atlas.repository.impexp.ImportTransforms;

import java.util.List;

public class AtlasEntityStreamForImport extends AtlasEntityStream implements EntityImportStream {
    private int currentPosition;

    public AtlasEntityStreamForImport(AtlasEntityWithExtInfo entityWithExtInfo, EntityStream entityStream) {
        super(entityWithExtInfo, entityStream);
    }

    @Override
    public AtlasEntity getByGuid(String guid) {
        AtlasEntity ent = super.entitiesWithExtInfo.getEntity(guid);

        if (ent == null && entityStream != null) {
            return entityStream.getByGuid(guid);
        }

        return ent;
    }

    @Override
    public int size() {
        return 1;
    }

    @Override
    public int getPosition() {
        return currentPosition;
    }

    @Override
    public void setPosition(int position) {
        // not applicable for a single entity stream
    }

    @Override
    public void setPositionUsingEntityGuid(String guid) {
    }

    @Override
    public AtlasEntityWithExtInfo getNextEntityWithExtInfo() {
        currentPosition++;

        AtlasEntity entity = next();

        return entity != null ? new AtlasEntityWithExtInfo(entity, super.entitiesWithExtInfo) : null;
    }

    @Override
    public AtlasEntityWithExtInfo getEntityWithExtInfo(String guid) {
        return null;
    }

    @Override
    public void onImportComplete(String guid) {
    }

    @Override
    public ImportTransforms getImportTransform() {
        return null;
    }

    @Override
    public void setImportTransform(ImportTransforms importTransform) {
    }

    @Override
    public List<BaseEntityHandler> getEntityHandlers() {
        return null;
    }

    @Override
    public void setEntityHandlers(List<BaseEntityHandler> entityHandlers) {
    }

    @Override
    public AtlasTypesDef getTypesDef() throws AtlasBaseException {
        return null;
    }

    @Override
    public AtlasExportResult getExportResult() throws AtlasBaseException {
        return null;
    }

    @Override
    public List<String> getCreationOrder() {
        return null;
    }

    @Override
    public void close() {
    }

    @Override
    public String getMd5Hash() {
        return null;
    }
}
