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/*
 * SonarQube
 * Copyright (C) 2009-2017 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.server.measure.ws;

import com.google.common.base.Joiner;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.HashBasedTable;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import com.google.common.collect.Table;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Stream;
import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.sonar.api.resources.Qualifiers;
import org.sonar.api.resources.ResourceTypes;
import org.sonar.api.web.UserRole;
import org.sonar.core.util.stream.MoreCollectors;
import org.sonar.db.DbClient;
import org.sonar.db.DbSession;
import org.sonar.db.component.ComponentDto;
import org.sonar.db.component.ComponentTreeQuery;
import org.sonar.db.component.SnapshotDto;
import org.sonar.db.measure.MeasureDto;
import org.sonar.db.measure.MeasureTreeQuery;
import org.sonar.db.metric.MetricDto;
import org.sonar.db.metric.MetricDtoFunctions;
import org.sonar.server.component.ComponentFinder;
import org.sonar.server.exceptions.NotFoundException;
import org.sonar.server.measure.ws.ComponentTreeData.Measure;
import org.sonar.server.user.UserSession;
import org.sonarqube.ws.client.measure.ComponentTreeWsRequest;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import static java.lang.String.format;
import static java.util.Collections.emptyMap;
import static java.util.Objects.requireNonNull;
import static org.sonar.api.utils.Paging.offset;
import static org.sonar.server.component.ComponentFinder.ParamNames.BASE_COMPONENT_ID_AND_KEY;
import static org.sonar.server.component.ComponentFinder.ParamNames.DEVELOPER_ID_AND_KEY;
import static org.sonar.server.measure.ws.ComponentTreeAction.LEAVES_STRATEGY;
import static org.sonar.server.measure.ws.ComponentTreeAction.STRATEGIES;
import static org.sonar.server.measure.ws.ComponentTreeAction.WITH_MEASURES_ONLY_METRIC_SORT_FILTER;
import static org.sonar.server.measure.ws.SnapshotDtoToWsPeriods.snapshotToWsPeriods;
import static org.sonarqube.ws.client.measure.MeasuresWsParameters.DEPRECATED_PARAM_BASE_COMPONENT_ID;
import static org.sonarqube.ws.client.measure.MeasuresWsParameters.PARAM_BRANCH;

public class ComponentTreeDataLoader {
  private static final Set QUALIFIERS_ELIGIBLE_FOR_BEST_VALUE = ImmutableSet.of(Qualifiers.FILE, Qualifiers.UNIT_TEST_FILE);
  private static final Joiner COMA_JOINER = Joiner.on(", ");

  private final DbClient dbClient;
  private final ComponentFinder componentFinder;
  private final UserSession userSession;
  private final ResourceTypes resourceTypes;

  public ComponentTreeDataLoader(DbClient dbClient, ComponentFinder componentFinder, UserSession userSession, ResourceTypes resourceTypes) {
    this.dbClient = dbClient;
    this.componentFinder = componentFinder;
    this.userSession = userSession;
    this.resourceTypes = resourceTypes;
  }

  ComponentTreeData load(ComponentTreeWsRequest wsRequest) {
    try (DbSession dbSession = dbClient.openSession(false)) {
      ComponentDto baseComponent = loadComponent(dbSession, wsRequest);
      checkPermissions(baseComponent);
      Optional baseSnapshot = dbClient.snapshotDao().selectLastAnalysisByRootComponentUuid(dbSession, baseComponent.projectUuid());
      if (!baseSnapshot.isPresent()) {
        return ComponentTreeData.builder()
          .setBaseComponent(baseComponent)
          .build();
      }
      Long developerId = searchDeveloperId(dbSession, wsRequest);

      ComponentTreeQuery componentTreeQuery = toComponentTreeQuery(wsRequest, baseComponent);
      List components = searchComponents(dbSession, componentTreeQuery);
      List metrics = searchMetrics(dbSession, wsRequest);
      Table measuresByComponentUuidAndMetric = searchMeasuresByComponentUuidAndMetric(dbSession, baseComponent, componentTreeQuery,
        components,
        metrics, developerId);

      components = filterComponents(components, measuresByComponentUuidAndMetric, metrics, wsRequest);
      components = sortComponents(components, wsRequest, metrics, measuresByComponentUuidAndMetric);

      int componentCount = components.size();
      components = paginateComponents(components, wsRequest);

      return ComponentTreeData.builder()
        .setBaseComponent(baseComponent)
        .setComponentsFromDb(components)
        .setComponentCount(componentCount)
        .setMeasuresByComponentUuidAndMetric(measuresByComponentUuidAndMetric)
        .setMetrics(metrics)
        .setPeriods(snapshotToWsPeriods(baseSnapshot.get()))
        .setReferenceComponentsByUuid(searchReferenceComponentsById(dbSession, components))
        .build();
    }
  }

  private ComponentDto loadComponent(DbSession dbSession, ComponentTreeWsRequest request) {
    String componentKey = request.getComponent();
    String componentId = request.getBaseComponentId();
    String branch = request.getBranch();
    checkArgument(componentId == null || branch == null, "'%s' and '%s' parameters cannot be used at the same time", DEPRECATED_PARAM_BASE_COMPONENT_ID, PARAM_BRANCH);
    return branch == null
      ? componentFinder.getByUuidOrKey(dbSession, componentId, componentKey, BASE_COMPONENT_ID_AND_KEY)
      : componentFinder.getByKeyAndBranch(dbSession, componentKey, branch);
  }

  @CheckForNull
  private Long searchDeveloperId(DbSession dbSession, ComponentTreeWsRequest wsRequest) {
    if (wsRequest.getDeveloperId() == null && wsRequest.getDeveloperKey() == null) {
      return null;
    }

    return componentFinder.getByUuidOrKey(dbSession, wsRequest.getDeveloperId(), wsRequest.getDeveloperKey(), DEVELOPER_ID_AND_KEY).getId();
  }

  private Map searchReferenceComponentsById(DbSession dbSession, List components) {
    List referenceComponentUUids = components.stream()
      .map(ComponentDto::getCopyResourceUuid)
      .filter(Objects::nonNull)
      .collect(MoreCollectors.toList(components.size()));
    if (referenceComponentUUids.isEmpty()) {
      return emptyMap();
    }

    return FluentIterable.from(dbClient.componentDao().selectByUuids(dbSession, referenceComponentUUids))
      .uniqueIndex(ComponentDto::uuid);
  }

  private List searchComponents(DbSession dbSession, ComponentTreeQuery componentTreeQuery) {
    Collection qualifiers = componentTreeQuery.getQualifiers();
    if (qualifiers != null && qualifiers.isEmpty()) {
      return Collections.emptyList();
    }
    return dbClient.componentDao().selectDescendants(dbSession, componentTreeQuery);
  }

  private List searchMetrics(DbSession dbSession, ComponentTreeWsRequest request) {
    List metricKeys = requireNonNull(request.getMetricKeys());
    List metrics = dbClient.metricDao().selectByKeys(dbSession, metricKeys);
    if (metrics.size() < metricKeys.size()) {
      List foundMetricKeys = Lists.transform(metrics, MetricDto::getKey);
      Set missingMetricKeys = Sets.difference(
        new LinkedHashSet<>(metricKeys),
        new LinkedHashSet<>(foundMetricKeys));

      throw new NotFoundException(format("The following metric keys are not found: %s", COMA_JOINER.join(missingMetricKeys)));
    }
    String forbiddenMetrics = metrics.stream()
      .filter(metric -> ComponentTreeAction.FORBIDDEN_METRIC_TYPES.contains(metric.getValueType()))
      .map(MetricDto::getKey)
      .sorted()
      .collect(MoreCollectors.join(COMA_JOINER));
    checkArgument(forbiddenMetrics.isEmpty(), "Metrics %s can't be requested in this web service. Please use api/measures/component", forbiddenMetrics);
    return metrics;
  }

  private Table searchMeasuresByComponentUuidAndMetric(DbSession dbSession, ComponentDto baseComponent,
    ComponentTreeQuery componentTreeQuery,
    List components, List metrics, @Nullable Long developerId) {

    Map metricsById = Maps.uniqueIndex(metrics, MetricDto::getId);
    MeasureTreeQuery measureQuery = MeasureTreeQuery.builder()
      .setStrategy(MeasureTreeQuery.Strategy.valueOf(componentTreeQuery.getStrategy().name()))
      .setNameOrKeyQuery(componentTreeQuery.getNameOrKeyQuery())
      .setQualifiers(componentTreeQuery.getQualifiers())
      .setPersonId(developerId)
      .setMetricIds(new ArrayList<>(metricsById.keySet()))
      .build();

    Table measuresByComponentUuidAndMetric = HashBasedTable.create(components.size(), metrics.size());
    dbClient.measureDao().selectTreeByQuery(dbSession, baseComponent, measureQuery, result -> {
      MeasureDto measureDto = result.getResultObject();
      measuresByComponentUuidAndMetric.put(
        measureDto.getComponentUuid(),
        metricsById.get(measureDto.getMetricId()),
        Measure.createFromMeasureDto(measureDto));
    });

    addBestValuesToMeasures(measuresByComponentUuidAndMetric, components, metrics);

    return measuresByComponentUuidAndMetric;
  }

  /**
   * Conditions for best value measure:
   * 
    *
  • component is a production file or test file
  • *
  • metric is optimized for best value
  • *
*/ private static void addBestValuesToMeasures(Table measuresByComponentUuidAndMetric, List components, List metrics) { List metricDtosWithBestValueMeasure = metrics.stream() .filter(MetricDtoFunctions.isOptimizedForBestValue()) .map(new MetricDtoToMetricDtoWithBestValue()) .collect(MoreCollectors.toList(metrics.size())); if (metricDtosWithBestValueMeasure.isEmpty()) { return; } Stream componentsEligibleForBestValue = components.stream().filter(IsFileComponent.INSTANCE); componentsEligibleForBestValue.forEach(component -> { for (MetricDtoWithBestValue metricWithBestValue : metricDtosWithBestValueMeasure) { if (measuresByComponentUuidAndMetric.get(component.uuid(), metricWithBestValue.getMetric()) == null) { measuresByComponentUuidAndMetric.put(component.uuid(), metricWithBestValue.getMetric(), Measure.createFromMeasureDto(metricWithBestValue.getBestValue())); } } }); } private static List filterComponents(List components, Table measuresByComponentUuidAndMetric, List metrics, ComponentTreeWsRequest wsRequest) { if (!componentWithMeasuresOnly(wsRequest)) { return components; } String metricKeyToSort = wsRequest.getMetricSort(); Optional metricToSort = metrics.stream().filter(m -> metricKeyToSort.equals(m.getKey())).findFirst(); checkState(metricToSort.isPresent(), "Metric '%s' not found", metricKeyToSort, wsRequest.getMetricKeys()); return components .stream() .filter(new HasMeasure(measuresByComponentUuidAndMetric, metricToSort.get(), wsRequest)) .collect(MoreCollectors.toList(components.size())); } private static boolean componentWithMeasuresOnly(ComponentTreeWsRequest wsRequest) { return WITH_MEASURES_ONLY_METRIC_SORT_FILTER.equals(wsRequest.getMetricSortFilter()); } private static List sortComponents(List components, ComponentTreeWsRequest wsRequest, List metrics, Table measuresByComponentUuidAndMetric) { return ComponentTreeSort.sortComponents(components, wsRequest, metrics, measuresByComponentUuidAndMetric); } private static List paginateComponents(List components, ComponentTreeWsRequest wsRequest) { return components.stream() .skip(offset(wsRequest.getPage(), wsRequest.getPageSize())) .limit(wsRequest.getPageSize()) .collect(MoreCollectors.toList(wsRequest.getPageSize())); } @CheckForNull private List childrenQualifiers(ComponentTreeWsRequest request, String baseQualifier) { List requestQualifiers = request.getQualifiers(); List childrenQualifiers = null; if (LEAVES_STRATEGY.equals(request.getStrategy())) { childrenQualifiers = resourceTypes.getLeavesQualifiers(baseQualifier); } if (requestQualifiers == null) { return childrenQualifiers; } if (childrenQualifiers == null) { return requestQualifiers; } Sets.SetView qualifiersIntersection = Sets.intersection(new HashSet<>(childrenQualifiers), new HashSet(requestQualifiers)); return new ArrayList<>(qualifiersIntersection); } private ComponentTreeQuery toComponentTreeQuery(ComponentTreeWsRequest wsRequest, ComponentDto baseComponent) { List childrenQualifiers = childrenQualifiers(wsRequest, baseComponent.qualifier()); ComponentTreeQuery.Builder componentTreeQueryBuilder = ComponentTreeQuery.builder() .setBaseUuid(baseComponent.uuid()) .setStrategy(STRATEGIES.get(wsRequest.getStrategy())); if (wsRequest.getQuery() != null) { componentTreeQueryBuilder.setNameOrKeyQuery(wsRequest.getQuery()); } if (childrenQualifiers != null) { componentTreeQueryBuilder.setQualifiers(childrenQualifiers); } return componentTreeQueryBuilder.build(); } private void checkPermissions(ComponentDto baseComponent) { userSession.checkComponentPermission(UserRole.USER, baseComponent); } private enum IsFileComponent implements Predicate { INSTANCE; @Override public boolean test(@Nonnull ComponentDto input) { return QUALIFIERS_ELIGIBLE_FOR_BEST_VALUE.contains(input.qualifier()); } } private static class MetricDtoToMetricDtoWithBestValue implements Function { @Override public MetricDtoWithBestValue apply(@Nonnull MetricDto input) { return new MetricDtoWithBestValue(input); } } }