org.eclipse.opencert.elastic/src/org/eclipse/opencert/elastic/search/ElasticFinderImpl.java

/*******************************************************************************
 * Copyright (C) 2018 ANSYS medini Technologies AG
 * 
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 * 
 * SPDX-License-Identifier: EPL-2.0
 * 
 * Contributors: 
 * 	ANSYS medini Technologies AG - initial API and implementation
 ******************************************************************************/
package org.eclipse.opencert.elastic.search;

import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.eclipse.opencert.elastic.ElasticClient;
import org.eclipse.opencert.elastic.ElasticClientImpl;

/**
 * Factory for the {@link ElasticFinder}.
 *
 * @author mauersberger
 */
public class ElasticFinderImpl implements ElasticFinder {

	// XXX hack to get some API tests running
	private Collection<Object> dummyData = null;

	private ElasticClient client;
	
	/**
	 * Factory method to create a new {@link ElasticFinder}. XXX This is an
	 * intermediate feature.
	 * 
	 * @param data
	 * @return
	 */
	public static ElasticFinder onDummy(Object data) {
		ElasticFinderImpl impl = new ElasticFinderImpl();
		impl.dummyData = DummyData.INSTANCE.convert(data);
		return impl;
	}

	public static ElasticFinder onDefaultClient() {
		ElasticClient client = ElasticClientImpl.on("localhost", 9200, "http");
		return onClient(client);
	}

	public static ElasticFinder onClient(ElasticClient client) {
		ElasticFinderImpl impl = new ElasticFinderImpl();
		impl.client = client;
		return impl;
	}

	/*
	 * Intentionally private.
	 */
	private ElasticFinderImpl() {
		// just to avoid instantiation, force using the factory API
	}

	@Override
	public Set<Hit> search(String query, Map<String, Object> filters) {
		if (dummyData != null) {
			return searchInDummyData(query, filters);
		}
		
		try {
			this.client.search("_all", query, filters);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		return Collections.emptySet();
	}

	/*
	 * XXX Hack
	 */
	private Set<Hit> searchInDummyData(String query, Map<String, Object> filters) {
		Set<Hit> hits = new HashSet<>();
		for (Object data : dummyData) {
			String document = DummyData.INSTANCE.asDocument(data);
			if ((document.contains(query) || document.matches(query)) && matchFilters(document, filters)) {
				matchFilters(document, filters);
				Hit hit = new Hit();
				// we count 1 for string match + number of filters
				hit.score = 1 + (filters != null ? filters.size() : 0);
				hit.objectId = DummyData.INSTANCE.getId(document);
				hits.add(hit);
				System.out.println(document);
			}
		}
		return hits;
	}

	/*
	 * XXX Hack
	 */
	private boolean matchFilters(String document, Map<String, Object> filters) {
		// check filters
		if (filters == null || filters.isEmpty()) {
			return true;
		}

		for (String name : filters.keySet()) {
			String filter = name + ": " + filters.get(name).toString();
			if (!document.contains(filter)) {
				return false;
			}
		}
		// all filters passed
		return true;
	}
}