Blazegraph 中的詞匯創建

Question

我需要創建一個自定義地理空間數據類型來表示 Blazegraph 中的多邊形，但我不能這樣做，因為它需要為此定義一個詞匯表。 您能否寫信給我有關如何在 Blazegraph 中創建詞匯表的具體步驟？

Answer 1

在同事的幫助下，我設法定義了一個詞匯表，用於在 Blazegraph 中創建自定義地理空間數據類型。 我從此處https://github.com/blazegraph/database克隆了 Blazegraph 代碼，創建了以下 class 並構建（使用 mvn clean install -DskipTests）數據庫和 blazegraph-jar 項目。 最后，使用重命名的 blazegraph-jar...jar 文件作為 blazegraph.jar 並運行此命令：java -server -Xmx4g -Dbigdata.propertyFile=RWStore.properties -jar blazegraph.jar。

package com.bigdata.rdf.vocab;

import com.bigdata.rdf.store.AbstractTripleStore;
import com.bigdata.rdf.vocab.BaseVocabularyDecl;
import com.bigdata.rdf.vocab.Vocabulary;
import com.bigdata.rdf.vocab.core.BigdataCoreVocabulary_v20160317;
import org.openrdf.model.impl.URIImpl;

/**
* 
* A {@link Vocabulary} covering the land use code (LUCODE) data.
* Use the vocabulary by adding a property to the configuration file (RWStore.properties) per below.
* 
* <code>
* 
 com.bigdata.rdf.store.AbstractTripleStore.vocabularyClass=
 com.bigdata.rdf.vocab.LucodeKGVocabulary
* </code>
*
* @author <a href="mailto:msff2@cam.ac.uk">Feroz Farazi</a>
* @version $Id$
* 
*/
public class LucodeKGVocabulary extends BigdataCoreVocabulary_v20160317 {

private String[] uris = {"http://polygon-1-7",
        "http://my-lat-lon-starttime-endtime-dt"};

/**
 * De-serialization ctor.
 */
public LucodeKGVocabulary() {
    
    super();
    
}

/**
 * Used by {@link AbstractTripleStore#create()}.
 *
 * @param namespace
 *            The namespace of the KB instance.
 */
public LucodeKGVocabulary(final String namespace) {

    super( namespace );

}

@Override
protected void addValues() {
    
    super.addValues();

    for (String uri: uris) {
        URIImpl impl = new URIImpl(uri);
        BaseVocabularyDecl decl = new BaseVocabularyDecl(impl);
        addDecl(decl);
    }

  }

}

我將以下配置參數放在 RWStore.properties 文件中：

# Sets journal parameters.
com.bigdata.journal.AbstractJournal.file=bigdata.jnl
com.bigdata.journal.AbstractJournal.initialExtent=209715200
com.bigdata.journal.AbstractJournal.maximumExtent=209715200
# Sets the textIndex parameter
com.bigdata.rdf.store.AbstractTripleStore.textIndex=false
com.bigdata.rdf.store.AbstractTripleStore.axiomsClass=
com.bigdata.rdf.axioms.NoAxioms
com.bigdata.rdf.sail.isolatableIndices=false
com.bigdata.rdf.sail.truthMaintenance=false
com.bigdata.rdf.store.AbstractTripleStore.justify=false
# Use our private vocabularies
com.bigdata.rdf.store.AbstractTripleStore.vocabularyClass=
com.bigdata.rdf.vocab.LucodeKGVocabulary
# Assigns the namespace or repository name
com.bigdata.rdf.sail.namespace=testgeospatialdb
com.bigdata.namespace.geospatialdata.spo.com.bigdata.btree.BTree.
branchingFactor=1024
com.bigdata.rdf.store.AbstractTripleStore.quads=false
com.bigdata.namespace.geospatialdata.lex.com.bigdata.btree.BTree.
branchingFactor=400
com.bigdata.rdf.store.AbstractTripleStore.geoSpatial=true
com.bigdata.rdf.store.AbstractTripleStore.statementIdentifiers=false
com.bigdata.rdf.store.AbstractTripleStore.geoSpatialDatatypeConfig.1={ 
"config": { "uri": "http://polygon-1-7", "fields": [ { "valueType": 
"DOUBLE", 
"multiplier": "100000", "serviceMapping": "LATITUDE" }, { "valueType": 
"DOUBLE", "multiplier": "100000", "serviceMapping": "LONGITUDE" }, { 
"valueType": "LONG", "serviceMapping": "starttime" }, { "valueType": 
"LONG", 
"serviceMapping": "endtime" }{ "valueType": "DOUBLE", "multiplier": 
"100000", 
"serviceMapping": "LATITUDE" }, { "valueType": "DOUBLE", "multiplier": 
"100000", "serviceMapping": "LONGITUDE" }, { "valueType": "LONG", 
"serviceMapping": "starttime" }, { "valueType": "LONG", "serviceMapping": 
"endtime" }{ "valueType": "DOUBLE", "multiplier": "100000", 
"serviceMapping": 
"LATITUDE" }, { "valueType": "DOUBLE", "multiplier": "100000", 
"serviceMapping": "LONGITUDE" }, { "valueType": "LONG", "serviceMapping": 
"starttime" }, { "valueType": "LONG", "serviceMapping": "endtime" }{ 
"valueType": "DOUBLE", "multiplier": "100000", "serviceMapping": 
"LATITUDE" 
}, { "valueType": "DOUBLE", "multiplier": "100000", "serviceMapping": 
"LONGITUDE" }, { "valueType": "LONG", "serviceMapping": "starttime" }, { 
"valueType": "LONG", "serviceMapping": "endtime" }{ "valueType": "DOUBLE", 
"multiplier": "100000", "serviceMapping": "LATITUDE" }, { "valueType": 
"DOUBLE", "multiplier": "100000", "serviceMapping": "LONGITUDE" }, { 
"valueType": "LONG", "serviceMapping": "starttime" }, { "valueType": 
"LONG", 
"serviceMapping": "endtime" }{ "valueType": "DOUBLE", "multiplier": 
"100000", 
"serviceMapping": "LATITUDE" }, { "valueType": "DOUBLE", "multiplier": 
"100000", "serviceMapping": "LONGITUDE" }, { "valueType": "LONG", 
"serviceMapping": "starttime" }, { "valueType": "LONG", "serviceMapping": 
"endtime" }{ "valueType": "DOUBLE", "multiplier": "100000", 
"serviceMapping": 
"LATITUDE" }, { "valueType": "DOUBLE", "multiplier": "100000", 
"serviceMapping": "LONGITUDE" }, { "valueType": "LONG", "serviceMapping": 
"starttime" }, { "valueType": "LONG", "serviceMapping": "endtime" } ] } }