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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; 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.camunda.bpm.engine.rest.impl;

import java.util.List;

import javax.ws.rs.core.Request;
import javax.ws.rs.core.UriInfo;

import org.camunda.bpm.engine.management.SchemaLogEntry;
import org.camunda.bpm.engine.management.SchemaLogQuery;
import org.camunda.bpm.engine.rest.SchemaLogRestService;
import org.camunda.bpm.engine.rest.dto.SchemaLogEntryDto;
import org.camunda.bpm.engine.rest.dto.SchemaLogQueryDto;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * @author Miklas Boskamp
 *
 */
public class SchemaLogRestServiceImpl extends AbstractRestProcessEngineAware implements SchemaLogRestService {

  public SchemaLogRestServiceImpl(String engineName, ObjectMapper objectMapper) {
    super(engineName, objectMapper);
  }

  @Override
  public List getSchemaLog(Request request, UriInfo uriInfo, Integer firstResult, Integer maxResults) {
    return querySchemaLog(new SchemaLogQueryDto(getObjectMapper(), uriInfo.getQueryParameters()), firstResult, maxResults);
  }

  @Override
  public List querySchemaLog(SchemaLogQueryDto dto, Integer firstResult, Integer maxResults) {
    SchemaLogQuery query = dto.toQuery(processEngine);
    List schemaLogEntries;
    if (firstResult != null || maxResults != null) {
      schemaLogEntries = executePaginatedQuery(query, firstResult, maxResults);
    } else {
      schemaLogEntries = query.list();
    }
    return SchemaLogEntryDto.fromSchemaLogEntries(schemaLogEntries);
  }

  protected List executePaginatedQuery(SchemaLogQuery query, Integer firstResult, Integer maxResults) {
    if (firstResult == null) {
      firstResult = 0;
    }
    if (maxResults == null) {
      maxResults = Integer.MAX_VALUE;
    }
    return query.listPage(firstResult, maxResults);
  }
}