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Main ACS AEM Commons OSGi Bundle. Includes commons utilities.
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/*
 * ACS AEM Commons
 *
 * Copyright (C) 2013 - 2023 Adobe
 *
 * 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 com.adobe.acs.commons.util.impl;

import com.adobe.acs.commons.cqsearch.QueryUtil;
import com.adobe.acs.commons.util.ParameterUtil;
import com.adobe.acs.commons.util.QueryHelper;
import com.day.cq.search.PredicateGroup;
import com.day.cq.search.QueryBuilder;
import com.day.cq.search.result.Hit;
import org.apache.commons.lang.StringUtils;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;

import javax.jcr.NodeIterator;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.jcr.query.Query;
import javax.jcr.query.QueryManager;
import javax.jcr.query.QueryResult;
import javax.jcr.query.Row;
import javax.jcr.query.RowIterator;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

@Component
@Service
public class QueryHelperImpl implements QueryHelper {

    @Reference
    private QueryBuilder queryBuilder;

    public static final String QUERY_BUILDER = "queryBuilder";

    public static final String LIST = "list";

    /**
     * Find all the resources needed for the package definition.
     *
     * @param resourceResolver the resource resolver to find the resources
     * @param language         the Query language
     * @param statement        the Query statement
     * @param relPath          the relative path to resolve against query result nodes for package resources
     * @return a unique set of paths to include in the package
     * @throws RepositoryException
     */
    public List findResources(final ResourceResolver resourceResolver,
                                        final String language,
                                        final String statement,
                                        final String relPath) throws RepositoryException {
        if (StringUtils.isEmpty(statement)) {
            return Collections.emptyList();
        }
        
        final String[] lines = statement.split("\\r?\\n");

        if (QUERY_BUILDER.equalsIgnoreCase(language)) {
            return getResourcesFromQueryBuilder(resourceResolver, lines, relPath);
        } else if (LIST.equalsIgnoreCase(language)) {
            return getResourcesFromList(resourceResolver, lines, relPath);
        } else {
            return getResourcesFromQuery(resourceResolver, language, statement, relPath);
        }
    }

    private List getResourcesFromQuery(ResourceResolver resourceResolver, String language, String statement, String relPath) throws RepositoryException {
        final List resources = new ArrayList<>();
        QueryManager queryManager = resourceResolver.adaptTo(Session.class).getWorkspace().getQueryManager();
        NodeIterator nodeIter = queryManager.createQuery(statement, language).execute().getNodes();

        while (nodeIter.hasNext()) {
            Resource resource = resourceResolver.getResource(nodeIter.nextNode().getPath());
            final Resource relativeAwareResource = getRelativeAwareResource(resource, relPath);

            if (relativeAwareResource != null) {
                resources.add(relativeAwareResource);
            }
        }

        return resources;
    }

    private List getResourcesFromList(ResourceResolver resourceResolver, String[] lines, String relPath) {
        final List resources = new ArrayList<>();
        for (String line : lines) {
            if (StringUtils.isNotBlank(line)) {
                final Resource resource = resourceResolver.getResource(line);
                final Resource relativeAwareResource = getRelativeAwareResource(resource, relPath);

                if (relativeAwareResource != null) {
                    resources.add(relativeAwareResource);
                }
            }
        }

        return resources;
    }

    private List getResourcesFromQueryBuilder(ResourceResolver resourceResolver, String[] lines, String relPath) throws RepositoryException {
        final List resources = new ArrayList<>();
        final Map params = ParameterUtil.toMap(lines, "=", false, null, true);

        // ensure all results are returned
        if (!params.containsKey("p.limit")) {
            params.put("p.limit", "-1");
        }

        com.day.cq.search.Query query = queryBuilder.createQuery(PredicateGroup.create(params), resourceResolver.adaptTo(Session.class));
        QueryUtil.setResourceResolverOn(resourceResolver, query);
        final List hits = query.getResult().getHits();
        for (final Hit hit : hits) {
            final Resource resource = resourceResolver.getResource(hit.getPath());
            final Resource relativeAwareResource = getRelativeAwareResource(resource, relPath);

            if (relativeAwareResource != null) {
                resources.add(relativeAwareResource);
            }
        }

        return resources;
    }

    @Override
    public boolean isTraversal(ResourceResolver resourceResolver, String language, String statement) throws RepositoryException {
        final QueryManager queryManager = resourceResolver.adaptTo(Session.class).getWorkspace().getQueryManager();

        final Query query = queryManager.createQuery("explain " + statement, language);
        final QueryResult queryResult = query.execute();

        final RowIterator rows = queryResult.getRows();
        final Row firstRow = rows.nextRow();

        final String plan = firstRow.getValue("plan").getString();
        return StringUtils.contains(plan, " /* traverse ");
    }

    @Override
    @SuppressWarnings("deprecation") // XPATH is dead, long live XPATH
    public boolean isTraversal(ResourceResolver resourceResolver, Map queryBuilderParams) throws RepositoryException {
        com.day.cq.search.Query query = queryBuilder.createQuery(PredicateGroup.create(queryBuilderParams), resourceResolver.adaptTo(Session.class));
        QueryUtil.setResourceResolverOn(resourceResolver, query);
        return isTraversal(resourceResolver, Query.XPATH, query.getResult().getQueryStatement());
    }

    /**
     * Get the relative resource of the given resource if it resolves otherwise
     * the provided resource.
     *
     * @param resource the resource
     * @param relPath  the relative path to resolve against the resource
     * @return the relative resource if it resolves otherwise the resource
     */
    private Resource getRelativeAwareResource(final Resource resource, final String relPath) {
        if (resource != null && StringUtils.isNotBlank(relPath)) {
            final Resource relResource = resource.getChild(relPath);

            if (relResource != null) {
                return relResource;
            }
        }

        return resource;
    }
}