New entailment service and endpoint

acrepo-exts-entailment/README.md

+Repository PCDM object extension
+================================
+
+This extension operates on LDP resources, performing 
+RDFS entailment for the specified ontologies and returns
+the entailed triples for the resource. 
+
+For example:
+
+    curl http://localhost:9109/entailment?context=http://localhost:8080/fcrepo/rest/a/b/c
+
+Building
+--------
+
+To build this project use
+
+    gradle install
+
+Deploying in OSGi
+-----------------
+
+This projects can be deployed in an OSGi container. For example using
+[Apache Karaf](http://karaf.apache.org) version 4.x or better, you can run the following
+command from its shell:
+
+    feature:repo-add mvn:edu.amherst.acdc/acrepo-karaf/LATEST/xml/features
+    feature:install acrepo-exts-entailment
+    feature:install acrepo-services-entailment
+
+Configuration
+-------------
+
+The application can be configured by creating the following configuration
+file `$KARAF_HOME/etc/edu.amherst.acdc.exts.entailment.cfg`. The following values
+are available for configuration:
+
+The base url of the fedora repository
+
+    fcrepo.baseUrl=localhost:8080/fcrepo/rest
+
+The port on which the service is made availalbe
+
+    rest.port=9109
+
+The hostname for the service
+
+    rest.host=localhost
+
+The REST prefix
+
+    rest.prefix=/entailment
+
+By editing this file, any currently running routes will be immediately redeployed
+with the new values.
+
+For more help see the [Apache Camel](http://camel.apache.org) documentation
+

acrepo-exts-entailment/build.gradle

+apply plugin: 'osgi'
+
+description = 'Entailed Triple Builder'
+dependencies {
+    compile group: 'org.apache.camel', name: 'camel-core', version: camelVersion
+    compile group: 'org.apache.camel', name: 'camel-blueprint', version: camelVersion
+    compile group: 'org.apache.camel', name: 'camel-jetty9', version: camelVersion
+    compile(group: 'org.fcrepo.camel', name: 'fcrepo-camel', version: fcrepoCamelVersion) {
+        exclude(module: 'slf4j-log4j12')
+    }
+    compile group: 'org.apache.jena', name: 'jena-osgi', version: jenaVersion
+    compile project(':acrepo-services-entailment')
+    testCompile group: 'junit', name: 'junit', version: junitVersion
+    testCompile group: 'org.apache.camel', name: 'camel-test-blueprint', version: camelVersion
+    testCompile group: 'ch.qos.logback', name: 'logback-classic', version: logbackVersion
+}
+
+jar {
+    manifest {
+        description project.description
+        docURL project.docURL
+        vendor project.vendor
+        license project.license
+
+        instruction 'Import-Package', "org.apache.camel,org.fcrepo.camel,edu.amherst.acdc.services.entailment,${defaultOsgiImports}"
+        instruction 'Export-Package', "edu.amherst.acdc.exts.entailment;version=${projectOsgiVersion}"
+    }
+}
+
+artifacts {
+    archives (file('build/cfg/main/edu.amherst.acdc.exts.entailment.cfg')) {
+        classifier 'configuration'
+        type 'cfg'
+    }
+}

acrepo-exts-entailment/src/main/cfg/edu.amherst.acdc.exts.entailment.cfg

+# HTTP Port
+rest.host=localhost
+rest.port=9109
+rest.prefix=/entailment
+
+# Concurrency level (this MUST be > 1)
+entailment.concurrency=10
+
+# Repository Base URL (it MUST start with http:// or https://)
+fcrepo.baseUrl=http://localhost:8080/fcrepo/rest
+fcrepo.authUsername=
+fcrepo.authPassword=
+
+# API-X configuration
+extension.load=false
+extension.load.uri=http://apix/services//apix:load
+extension.load.maximumRedeliveries=60

acrepo-exts-entailment/src/main/java/edu/amherst/acdc/exts/entailment/EntailmentRouter.java

+/*
+ * Copyright 2016 Amherst College
+ *
+ * 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 edu.amherst.acdc.exts.entailment;
+
+//import static java.util.Optional.ofNullable;
+import static org.apache.camel.Exchange.CONTENT_TYPE;
+import static org.apache.camel.Exchange.HTTP_METHOD;
+//import static org.apache.camel.Exchange.HTTP_RESPONSE_CODE;
+import static org.fcrepo.camel.FcrepoHeaders.FCREPO_BASE_URL;
+import static org.fcrepo.camel.FcrepoHeaders.FCREPO_URI;
+
+//import java.util.Optional;
+
+import org.apache.camel.builder.RouteBuilder;
+//import org.apache.jena.riot.Lang;
+//import org.apache.jena.riot.RDFLanguages;
+
+/**
+ * A content router for handling ORE extension requests
+ *
+ * @author Bethany Seeger
+ */
+public class EntailmentRouter extends RouteBuilder {
+
+    private final static String DEFAULT_CONTENT_TYPE = "text/turtle";
+    private final static String HTTP_QUERY_CONTEXT = "context";
+
+    /**
+     * Configure the message route workflow.
+     */
+    public void configure() throws Exception {
+
+        from("jetty:http://{{rest.host}}:{{rest.port}}{{rest.prefix}}?" +
+              "sendServerVersion=false&httpMethodRestrict=GET,OPTIONS")
+          .routeId("EntailmentRouter")
+          .removeHeader("User-Agent")
+          .process(e -> e.getIn().setHeader(FCREPO_URI,
+                      e.getIn().getHeader(HTTP_QUERY_CONTEXT,
+                          e.getIn().getHeader("Apix-Ldp-Resource"))))
+          .setHeader(FCREPO_BASE_URL).simple("{{fcrepo.baseUrl}}")
+          .choice()
+            .when(header(HTTP_METHOD).isEqualTo("OPTIONS"))
+              .setHeader(CONTENT_TYPE).constant("text/turtle")
+              .setHeader("Allow").constant("GET,OPTIONS")
+              .to("language:simple:resource:classpath:options.ttl")
+            .when(header(HTTP_QUERY_CONTEXT).startsWith(header(FCREPO_BASE_URL)))
+              .to("direct:get");
+
+        // first get resource
+        // then pass it to getTriples... which is defined in the blueprint script.
+        //
+        from("direct:get").routeId("EntailementGetTriples")
+          .log("Building RDFS Entailment Info ${body}")
+          .to("fcrepo:{{fcrepo.baseUrl}}?throwExceptionOnFailure=false")
+          .to("direct:getTriples");
+    }
+ }

acrepo-exts-entailment/src/main/resources/OSGI-INF/blueprint/blueprint.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
+       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.1.0"
+       xsi:schemaLocation="
+       http://www.osgi.org/xmlns/blueprint/v1.0.0 http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd
+       http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.1.0 http://aries.apache.org/schemas/blueprint-cm/blueprint-cm-1.1.0.xsd
+       http://camel.apache.org/schema/blueprint http://camel.apache.org/schema/blueprint/camel-blueprint.xsd">
+
+   <!-- OSGI blueprint property placeholder -->
+   <cm:property-placeholder persistent-id="edu.amherst.acdc.exts.entailment" update-strategy="reload">
+     <cm:default-properties>
+       <cm:property name="rest.port" value="9109"/>
+       <cm:property name="rest.prefix" value="/entailment"/>
+       <cm:property name="rest.host" value="localhost"/>
+       <cm:property name="entailment.concurrency" value="10"/>
+       <cm:property name="fcrepo.baseUrl" value="http://localhost:8080/fcrepo/rest"/>
+       <cm:property name="fcrepo.authUsername" value=""/>
+       <cm:property name="fcrepo.authPassword" value=""/>
+       <cm:property name="extension.load" value="false" />
+       <cm:property name="extension.load.uri" value="http://apix/services//apix:load" />
+       <cm:property name="extension.load.maximumRedeliveries" value="60" />
+     </cm:default-properties>
+   </cm:property-placeholder>
+
+   <reference id="entailmentService" interface="edu.amherst.acdc.services.entailment.EntailmentService" filter="(osgi.jndi.service.name=acrepo/Entailment)" />
+
+   <bean id="fcrepo" class="org.fcrepo.camel.FcrepoComponent">
+     <property name="authUsername" value="${fcrepo.authUsername}"/>
+     <property name="authPassword" value="${fcrepo.authPassword}"/>
+     <property name="baseUrl" value="${fcrepo.baseUrl}"/>
+   </bean>
+
+  <camelContext id="AcrepoExtEntailment" xmlns="http://camel.apache.org/schema/blueprint">
+    <package>edu.amherst.acdc.exts.entailment</package>
+
+    <route id="EntailmentTriples">
+      <from uri="direct:getTriples"/>
+      <setBody>
+        <method ref="entailmentService" method="getEntailedTriples(${header[CamelFcrepoUri]}, ${body}, ${header[Content-Type]})"/>
+      </setBody>
+    </route>
+
+    <!-- Self-register the loader service as an extension -->
+    <route id="load-extension">
+      <from uri="timer:register?repeatCount=1" />
+      <onException>
+        <exception>java.lang.Exception</exception>
+        <redeliveryPolicy maximumRedeliveries="{{extension.load.maximumRedeliveries}}"
+          logRetryAttempted="true" retryAttemptedLogLevel="INFO" />
+      </onException>
+      <setHeader headerName="Content-Type">
+        <constant>text/plain</constant>
+      </setHeader>
+      <setHeader headerName="CamelHttpMethod">
+        <constant>POST</constant>
+      </setHeader>
+      <setBody>
+        <simple>http://{{rest.host}}:{{rest.port}}{{rest.prefix}}</simple>
+      </setBody>
+      <choice>
+        <when>
+          <simple>{{extension.load}}</simple>
+          <to
+            uri="jetty:{{extension.load.uri}}?okStatusCodeRange=200-399" />
+        </when>
+      </choice>
+    </route>
+
+  </camelContext>
+
+</blueprint>

acrepo-exts-entailment/src/main/resources/options.ttl

+@prefix owl:<http://www.w3.org/2002/07/owl#> .
+@prefix rdfs:<http://www.w3.org/2000/01/rdf-schema#> .
+@prefix registry:<http://acdc.amherst.edu/ns/registry#> .
+@prefix apix:<http://fedora.info/definitions/v4/api-extension#> .
+@prefix ldp: <http://www.w3.org/ns/ldp#> .
+<> a apix:Extension;
+    rdfs:label "RDFS Entailment extension";
+    rdfs:comment "An extension that returns RDFS entailed triples for a resource";
+    apix:exposesService registry:EntailmentService
+    apix:exposesServiceAt "svc:entailment";
+    apix:bindsTo ldp:RDFSource .

acrepo-exts-entailment/src/test/resources/file.ttl

+@prefix premis: <http://www.loc.gov/premis/rdf/v1#> .
+@prefix pcdm: <http://pcdm.org/models#> .
+@prefix fedora: <http://fedora.info/definitions/v4/repository#> .
+@prefix ebucore: <http://www.ebu.ch/metadata/ontologies/ebucore/ebucore#> .
+@prefix ldp: <http://www.w3.org/ns/ldp#> .
+@prefix iana: <http://www.iana.org/assignments/relation/> .
+
+<http://localhost:8080/fcrepo/rest/pcdm/members/page1/files/file1> a fedora:Binary , fedora:Resource , ldp:NonRDFSource , pcdm:File ;
+    ebucore:filename "IMG_0107.jpg" ;
+    ebucore:hasMimeType "image/jpeg" ;
+    premis:hasSize "1565421"^^<http://www.w3.org/2001/XMLSchema#long> ;
+    premis:hasMessageDigest <urn:sha1:c9790c378f3589bfcfe092f834d212685f44fff9> ;
+    iana:describedby <http://localhost:8080/fcrepo/rest/pcdm/members/page1/files/file1/fcr:metadata> ;
+    fedora:lastModifiedBy "bypassAdmin" ;
+    fedora:createdBy "bypassAdmin" ;
+    fedora:created "2016-06-28T00:21:22.621Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
+    fedora:lastModified "2016-06-28T00:21:22.621Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
+    fedora:writable "true"^^<http://www.w3.org/2001/XMLSchema#boolean> ;
+    fedora:hasParent <http://localhost:8080/fcrepo/rest/pcdm/members/page1/files> ;
+    fedora:numberOfChildren "0"^^<http://www.w3.org/2001/XMLSchema#long> ;
+    fedora:hasFixityService <http://localhost:8080/fcrepo/rest/pcdm/members/page1/files/file1/fcr:fixity> .

acrepo-exts-entailment/src/test/resources/logback-test.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE configuration>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%p %d{HH:mm:ss.SSS} \(%c{0}\) %m%n</pattern>
+        </encoder>
+    </appender>
+
+  <logger name="edu.amherst.acdc.exts.pcdm" additivity="false" level="INFO">
+    <appender-ref ref="STDOUT"/>
+  </logger>
+  <logger name="org.apache.camel" additivity="false" level="INFO">
+    <appender-ref ref="STDOUT"/>
+  </logger>
+  <logger name="org.fcrepo.camel" additivity="false" level="INFO">
+    <appender-ref ref="STDOUT"/>
+  </logger>
+  <root additivity="false" level="INFO">
+    <appender-ref ref="STDOUT"/>
+  </root>
+</configuration>

acrepo-exts-entailment/src/test/resources/object.ttl

+@prefix pcdm: <http://pcdm.org/models#> .
+@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
+@prefix fedora: <http://fedora.info/definitions/v4/repository#> .
+@prefix ldp: <http://www.w3.org/ns/ldp#> .
+
+<http://localhost:8080/fcrepo/rest/pcdm> a fedora:Container , fedora:Resource , ldp:RDFSource , ldp:Container, pcdm:Object ;
+    skos:prefLabel "Top level pcdm:Object"@en ;
+    fedora:lastModifiedBy "bypassAdmin" ;
+    fedora:createdBy "bypassAdmin" ;
+    fedora:created "2016-06-28T00:14:06.677Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
+    fedora:lastModified "2016-06-28T00:16:25.55Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
+    fedora:writable "true"^^<http://www.w3.org/2001/XMLSchema#boolean> ;
+    fedora:hasParent <http://localhost:8080/fcrepo/rest/> ;
+    fedora:numberOfChildren "1"^^<http://www.w3.org/2001/XMLSchema#long> ;
+    ldp:contains <http://localhost:8080/fcrepo/rest/pcdm/members> ;
+    pcdm:hasMember <http://localhost:8080/fcrepo/rest/pcdm/members/page1> .

acrepo-exts-entailment/src/test/resources/page1.ttl

+@prefix pcdm: <http://pcdm.org/models#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix fedora: <http://fedora.info/definitions/v4/repository#> .
+@prefix ldp: <http://www.w3.org/ns/ldp#> .
+
+<http://localhost:8080/fcrepo/rest/pcdm/members/page1> a fedora:Container , fedora:Resource , ldp:RDFSource , ldp:Container , pcdm:Object ;
+    rdfs:label "Page 1" ;
+    fedora:lastModifiedBy "bypassAdmin" ;
+    fedora:createdBy "bypassAdmin" ;
+    fedora:created "2016-06-28T00:16:25.552Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
+    fedora:lastModified "2016-06-28T00:56:43.618Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
+    fedora:writable "true"^^<http://www.w3.org/2001/XMLSchema#boolean> ;
+    fedora:hasParent <http://localhost:8080/fcrepo/rest/pcdm/members> ;
+    fedora:numberOfChildren "1"^^<http://www.w3.org/2001/XMLSchema#long> ;
+    ldp:contains <http://localhost:8080/fcrepo/rest/pcdm/members/page1/files> ;
+    pcdm:hasFile <http://localhost:8080/fcrepo/rest/pcdm/members/page1/files/file1> .

acrepo-exts-entailment/src/test/resources/page2.ttl

+@prefix pcdm: <http://pcdm.org/models#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix fedora: <http://fedora.info/definitions/v4/repository#> .
+@prefix ldp: <http://www.w3.org/ns/ldp#> .
+
+<http://localhost:8080/fcrepo/rest/pcdm/members/page2> a fedora:Container , fedora:Resource , ldp:RDFSource , ldp:Container , pcdm:Object ;
+    rdfs:label "Page 2" ;
+    fedora:lastModifiedBy "bypassAdmin" ;
+    fedora:createdBy "bypassAdmin" ;
+    fedora:created "2016-06-28T00:16:25.552Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
+    fedora:lastModified "2016-06-28T00:56:43.618Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
+    fedora:writable "true"^^<http://www.w3.org/2001/XMLSchema#boolean> ;
+    fedora:hasParent <http://localhost:8080/fcrepo/rest/pcdm/members> ;
+    fedora:numberOfChildren "1"^^<http://www.w3.org/2001/XMLSchema#long> ;
+    ldp:contains <http://localhost:8080/fcrepo/rest/pcdm/members/page2/files> ;
+    pcdm:hasFile <http://localhost:8080/fcrepo/rest/pcdm/members/page2/files/file1> .

acrepo-karaf/src/main/resources/features.xml

@@ -46,6 +46,21 @@
     <configfile finalname="/etc/org.ops4j.datasource-idiomatic.cfg">mvn:edu.amherst.acdc/acrepo-connector-idiomatic-pgsql/${project.version}/cfg/configuration</configfile>
   </feature>
 
+  <feature name="acrepo-exts-entailment" version="${project.version}">
+    <details>Installs the RDFS entailment extension</details>
+
+    <feature version="${camelVersionRange}">camel</feature>
+    <feature version="${camelVersionRange}">camel-blueprint</feature>
+    <feature version="${camelVersionRange}">camel-jetty9</feature>
+    <feature version="${fcrepoCamelVersionRange}">fcrepo-camel</feature>
+    <feature version="${project.version}">acrepo-services-entailment</feature>
+    <feature version="${project.version}">acrepo-libs-jena</feature>
+
+    <bundle>mvn:edu.amherst.acdc/acrepo-exts-entailment/${project.version}</bundle>
+
+    <configfile finalname="/etc/edu.amherst.acdc.exts.entailment.cfg">mvn:edu.amherst.acdc/acrepo-exts-entailment/${project.version}/cfg/configuration</configfile>
+  </feature>
+
   <feature name="acrepo-exts-image" version="${project.version}">
     <details>Installs the image service</details>
 
@@ -106,6 +121,16 @@
     <configfile finalname="/etc/edu.amherst.acdc.exts.pcdm.cfg">mvn:edu.amherst.acdc/acrepo-exts-pcdm/${project.version}/cfg/configuration</configfile>
   </feature>
 
+  <feature name="acrepo-services-entailment" version="${project.version}">
+    <details>Installs the RDFS entailment service</details>
+
+    <feature version="${project.version}">acrepo-libs-jena</feature>
+
+    <bundle>mvn:edu.amherst.acdc/acrepo-services-entailment/${project.version}</bundle>
+
+    <configfile finalname="/etc/edu.amherst.acdc.services.entailment.cfg">mvn:edu.amherst.acdc/acrepo-services-entailment/${project.version}/cfg/configuration</configfile>
+  </feature>
+
   <feature name="acrepo-services-mint" version="${project.version}">
     <details>Installs the id minter</details>
 

acrepo-services-entailment/README.md

+Repository Inference Service
+============================
+
+This OSGi service can do object typing of RDF graphs using RDFS entailment.
+
+Building
+--------
+
+To build this project use
+
+    gradle install
+
+Deploying in OSGi
+-----------------
+
+Each of these projects can be deployed in an OSGi container. For example using
+[Apache Karaf](http://karaf.apache.org) version 4.x or better, you can run the following
+command from its shell:
+
+    feature:repo-add mvn:edu.amherst.acdc/acrepo-karaf/LATEST/xml/features
+    feature:install acrepo-services-entailment
+

acrepo-services-entailment/build.gradle

+apply plugin: 'osgi'
+
+description = 'RDF simple entailment service bundle'
+dependencies {
+    compile group: 'org.apache.jena', name: 'jena-osgi', version: jenaVersion
+    compile group: 'org.slf4j', name: 'slf4j-api', version: slf4jVersion
+    testCompile group: 'xerces', name: 'xercesImpl', version: xercesVersion
+    testCompile group: 'junit', name: 'junit', version: junitVersion
+    testCompile group: 'ch.qos.logback', name: 'logback-classic', version: logbackVersion
+}
+
+jar {
+    manifest {
+        description project.description
+        docURL project.docURL
+        vendor project.vendor
+        license project.license
+
+        instruction 'Import-Package', "org.apache.camel,${defaultOsgiImports}"
+        instruction 'Export-Package', "edu.amherst.acdc.services.entailment;version=${projectOsgiVersion}"
+    }
+}
+
+artifacts {
+    archives (file('build/cfg/main/edu.amherst.acdc.services.entailment.cfg')) {
+        classifier 'configuration'
+        type 'cfg'
+    }
+}
+

acrepo-services-entailment/src/main/cfg/edu.amherst.acdc.services.entailment.cfg

+# Comma separated list of ontologies that should pulled in for entailment to be done on them
+rdfs.ontologies= "http://purl.org/dc/terms/,http://purl.org/dc/elements/1.1/,https://www.w3.org/2009/08/skos-reference/skos.rdf,https://www.w3.org/2000/01/rdf-schema.rdf"
+output.lang="text/turtle"

acrepo-services-entailment/src/main/java/edu/amherst/acdc/services/entailment/EntailmentService.java

+/*
+ * Copyright 2016 Amherst College
+ *
+ * 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 edu.amherst.acdc.services.entailment;
+
+import java.io.InputStream;
+
+/**
+ * @author bseeger
+ * @since 3/23/2017
+ */
+public interface EntailmentService {
+
+    /**
+     * Take in a RDF resource and perform RDFS entailment on it, returning only the new triples
+     * created by entailment.
+     * @param subject Subject of the triples
+     * @param input   Input stream containing the information for the resource
+     * @param contentType The content type of the stream
+     */
+    InputStream getEntailedTriples(final String subject, final InputStream input, final String contentType);
+
+}

acrepo-services-entailment/src/main/java/edu/amherst/acdc/services/entailment/EntailmentServiceImpl.java

+/*
+ * Copyright 2016 Amherst College
+ *
+ * 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 edu.amherst.acdc.services.entailment;
+
+import static java.util.Optional.ofNullable;
+import static org.apache.http.impl.client.HttpClientBuilder.create;
+import static org.apache.jena.rdf.model.ModelFactory.createDefaultModel;
+import static org.apache.jena.rdf.model.ModelFactory.createRDFSModel;
+import static org.apache.jena.riot.RDFDataMgr.read;
+import static org.apache.jena.riot.RDFDataMgr.write;
+import static org.apache.jena.riot.RDFLanguages.contentTypeToLang;
+import static org.apache.jena.riot.Lang.TURTLE;
+import static org.apache.jena.riot.web.HttpOp.setDefaultHttpClient;
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.util.Arrays;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+import java.io.StringWriter;
+
+import org.apache.http.impl.client.LaxRedirectStrategy;
+import org.apache.jena.rdf.model.InfModel;
+import org.apache.jena.rdf.model.Model;
+import org.apache.jena.rdf.model.Resource;
+import org.apache.jena.rdf.model.Statement;
+import org.apache.jena.riot.Lang;
+import org.apache.jena.riot.RDFLanguages;
+import org.slf4j.Logger;
+
+/**
+ * @author bseeger
+ * @since 3/23/2017
+ */
+public class EntailmentServiceImpl implements EntailmentService {
+
+    private static final Logger LOGGER  = getLogger(EntailmentServiceImpl.class);
+
+    private List<String> rdfsOntologies;
+
+    private static final Lang DEFAULT_LANG = TURTLE;
+
+    private InfModel rdfsModel = createRDFSModel(createDefaultModel());
+
+    static {
+        setDefaultHttpClient(create().setRedirectStrategy(new LaxRedirectStrategy()).build());
+    }
+
+    /**
+     * Implementation of an Entailment Service to return the
+     * RDFS entailed triples for a resource.
+     */
+    public EntailmentServiceImpl(final String ontologies) {
+        LOGGER.info("EntailmentServiceImpl: ontologies: {}", ontologies);
+
+        rdfsOntologies = new ArrayList<>(Arrays.asList(ontologies.split(",")));
+        rdfsOntologies.forEach(