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https://issues.apache.org/jira/browse/GORA-664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17344702#comment-17344702
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ASF GitHub Bot commented on GORA-664:
-------------------------------------
kamaci commented on a change in pull request #234:
URL: https://github.com/apache/gora/pull/234#discussion_r632649046
##########
File path:
gora-elasticsearch/src/main/java/org/apache/gora/elasticsearch/mapping/ElasticsearchMappingBuilder.java
##########
@@ -0,0 +1,212 @@
+/*
+ * 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
+ *
+ * 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.apache.gora.elasticsearch.mapping;
+
+import com.google.inject.ConfigurationException;
+import org.apache.commons.io.IOUtils;
+import org.apache.gora.elasticsearch.store.ElasticsearchStore;
+import org.apache.gora.persistency.impl.PersistentBase;
+import org.apache.gora.util.GoraException;
+import org.jdom.Document;
+import org.jdom.Element;
+import org.jdom.JDOMException;
+import org.jdom.input.SAXBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.xml.sax.SAXException;
+
+import javax.xml.XMLConstants;
+import javax.xml.transform.Source;
+import javax.xml.transform.stream.StreamSource;
+import javax.xml.validation.Schema;
+import javax.xml.validation.SchemaFactory;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.Charset;
+import java.util.List;
+import java.util.Locale;
+
+/**
+ * Builder for Mapping definitions of Elasticsearch.
+ */
+public class ElasticsearchMappingBuilder<K, T extends PersistentBase> {
+
+ private static final Logger LOG =
LoggerFactory.getLogger(ElasticsearchMappingBuilder.class);
+
+ /**
+ * XSD validation file for the XML mapping.
+ */
+ private static final String XSD_MAPPING_FILE = "gora-elasticsearch.xsd";
+
+ // Index description
+ static final String ATT_NAME = "name";
+
+ static final String ATT_TYPE = "type";
+
+ // Class description
+ static final String TAG_CLASS = "class";
+
+ static final String ATT_KEYCLASS = "keyClass";
+
+ static final String ATT_INDEX = "index";
+
+ static final String TAG_FIELD = "field";
+
+ static final String ATT_DOCFIELD = "docfield";
+
+ static final String ATT_SCALINGFACTOR = "scalingFactor";
+
+ /**
+ * Mapping instance being built.
+ */
+ private ElasticsearchMapping elasticsearchMapping;
+
+ private final ElasticsearchStore<K, T> dataStore;
+
+ /**
+ * Constructor for ElasticsearchMappingBuilder.
+ *
+ * @param store ElasticsearchStore instance
+ */
+ public ElasticsearchMappingBuilder(final ElasticsearchStore<K, T> store) {
+ this.elasticsearchMapping = new ElasticsearchMapping();
+ this.dataStore = store;
+ }
+
+ /**
+ * Returns the Elasticsearch Mapping being built.
+ *
+ * @return Elasticsearch Mapping instance
+ */
+ public ElasticsearchMapping getElasticsearchMapping() {
+ return elasticsearchMapping;
+ }
+
+ /**
+ * Sets the Elasticsearch Mapping.
+ *
+ * @param elasticsearchMapping Elasticsearch Mapping instance
+ */
+ public void setElasticsearchMapping(ElasticsearchMapping
elasticsearchMapping) {
+ this.elasticsearchMapping = elasticsearchMapping;
+ }
+
+ /**
+ * Reads Elasticsearch mappings from file.
+ *
+ * @param inputStream Mapping input stream
+ * @param xsdValidation Parameter for enabling XSD validation
+ */
+ public void readMappingFile(InputStream inputStream, boolean
xsdValidation) {
+ try {
+ SAXBuilder saxBuilder = new SAXBuilder();
+ if (inputStream == null) {
+ LOG.error("The mapping input stream is null!");
+ throw new GoraException("The mapping input stream is null!");
+ }
+
+ // Convert input stream to a string to use it a few times
+ String mappingStream = IOUtils.toString(inputStream,
Charset.defaultCharset());
+
+ // XSD validation for XML file
+ if (xsdValidation) {
+ Source xmlSource = new
StreamSource(IOUtils.toInputStream(mappingStream, Charset.defaultCharset()));
+ Schema schema =
SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI)
+ .newSchema(new
StreamSource(getClass().getClassLoader().getResourceAsStream(XSD_MAPPING_FILE)));
+ schema.newValidator().validate(xmlSource);
+ LOG.info("Mapping file is valid.");
+ }
+
+ Document document =
saxBuilder.build(IOUtils.toInputStream(mappingStream,
Charset.defaultCharset()));
+ if (document == null) {
+ LOG.error("The mapping document is null!");
+ throw new GoraException("The mapping document is null!");
+ }
+
+ Element root = document.getRootElement();
+ // Extract class descriptions
+ @SuppressWarnings("unchecked")
+ List<Element> classElements = root.getChildren(TAG_CLASS);
+ for (Element classElement : classElements) {
+ final Class<T> persistentClass =
dataStore.getPersistentClass();
+ final Class<K> keyClass = dataStore.getKeyClass();
+ if (haveKeyClass(keyClass, classElement)
+ && havePersistentClass(persistentClass, classElement))
{
+ loadPersistentClass(classElement, persistentClass);
+ break;
+ }
+ }
+
Review comment:
You can remove extra spaces.
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us...@infra.apache.org
> Add datastore for Elasticsearch
> -------------------------------
>
> Key: GORA-664
> URL: https://issues.apache.org/jira/browse/GORA-664
> Project: Apache Gora
> Issue Type: New Feature
> Reporter: Carlos Muñoz
> Assignee: Mariia Podorvanova
> Priority: Major
> Labels: outreachy2020
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Elasticsearch is a Lucene-based search engine that primarily focuses on
> distribution and availability. It could be a good alternative for the
> gora-solr module.
>
> [https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html]
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