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Subject: git commit: CLEREZZA-856: some first playing on a sparql storage
 backend
Date: Thu, 19 Dec 2013 10:28:56 +0000 (UTC)

Updated Branches:
  refs/heads/CLEREZZA-856 [created] ea6a70ce0


 CLEREZZA-856: some first playing on a sparql storage backend


Project: http://git-wip-us.apache.org/repos/asf/clerezza/repo
Commit: http://git-wip-us.apache.org/repos/asf/clerezza/commit/ea6a70ce
Tree: http://git-wip-us.apache.org/repos/asf/clerezza/tree/ea6a70ce
Diff: http://git-wip-us.apache.org/repos/asf/clerezza/diff/ea6a70ce

Branch: refs/heads/CLEREZZA-856
Commit: ea6a70ce0849116337687ed7fab1808d492741af
Parents: 0627f04
Author: Reto Bachmann-Gmür <reto@apache.org>
Authored: Thu Dec 19 11:28:13 2013 +0100
Committer: Reto Bachmann-Gmür <reto@apache.org>
Committed: Thu Dec 19 11:28:13 2013 +0100

----------------------------------------------------------------------
 rdf.storage.sparql/LICENSE                      | 201 +++++++++++++++
 rdf.storage.sparql/nb-configuration.xml         |  18 ++
 rdf.storage.sparql/nbactions.xml                |  22 ++
 rdf.storage.sparql/pom.xml                      | 124 +++++++++
 .../storage/sparql/SparqlStorageProvider.scala  | 252 +++++++++++++++++++
 5 files changed, 617 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/clerezza/blob/ea6a70ce/rdf.storage.sparql/LICENSE
----------------------------------------------------------------------
diff --git a/rdf.storage.sparql/LICENSE b/rdf.storage.sparql/LICENSE
new file mode 100644
index 0000000..261eeb9
--- /dev/null
+++ b/rdf.storage.sparql/LICENSE
@@ -0,0 +1,201 @@
+                                 Apache License
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+   Unless required by applicable law or agreed to in writing, software
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http://git-wip-us.apache.org/repos/asf/clerezza/blob/ea6a70ce/rdf.storage.sparql/nb-configuration.xml
----------------------------------------------------------------------
diff --git a/rdf.storage.sparql/nb-configuration.xml b/rdf.storage.sparql/nb-configuration.xml
new file mode 100644
index 0000000..ec4540c
--- /dev/null
+++ b/rdf.storage.sparql/nb-configuration.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project-shared-configuration>
+    <!--
+This file contains additional configuration written by modules in the NetBeans IDE.
+The configuration is intended to be shared among all the users of project and
+therefore it is assumed to be part of version control checkout.
+Without this configuration present, some functionality in the IDE may be limited or fail altogether.
+-->
+    <properties xmlns="http://www.netbeans.org/ns/maven-properties-data/1">
+        <!--
+Properties that influence various parts of the IDE, especially code formatting and the like. 
+You can copy and paste the single properties, into the pom.xml file and the IDE will pick them up.
+That way multiple projects can share the same settings (useful for formatting rules for example).
+Any value defined here will override the pom.xml file value but is only applicable to the current project.
+-->
+        <netbeans.compile.on.save>none</netbeans.compile.on.save>
+    </properties>
+</project-shared-configuration>

http://git-wip-us.apache.org/repos/asf/clerezza/blob/ea6a70ce/rdf.storage.sparql/nbactions.xml
----------------------------------------------------------------------
diff --git a/rdf.storage.sparql/nbactions.xml b/rdf.storage.sparql/nbactions.xml
new file mode 100644
index 0000000..ffd7a0f
--- /dev/null
+++ b/rdf.storage.sparql/nbactions.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<actions>
+  <action>
+    <actionName>CUSTOM-deploy to localhost:8080</actionName>
+    <displayName>deploy to localhost:8080</displayName>
+    <goals>
+      <goal>install</goal>
+      <goal>org.apache.sling:maven-sling-plugin:install</goal>
+    </goals>
+  </action>
+  <action>
+            <actionName>CUSTOM-fusepool-info</actionName>
+            <displayName>fusepool-info</displayName>
+            <goals>
+                <goal>install</goal>
+                <goal>org.apache.sling:maven-sling-plugin:install</goal>
+            </goals>
+            <properties>
+                <sling.url>http://platform.fusepool.info/system/console</sling.url>
+            </properties>
+        </action>
+</actions>

http://git-wip-us.apache.org/repos/asf/clerezza/blob/ea6a70ce/rdf.storage.sparql/pom.xml
----------------------------------------------------------------------
diff --git a/rdf.storage.sparql/pom.xml b/rdf.storage.sparql/pom.xml
new file mode 100644
index 0000000..cbe1614
--- /dev/null
+++ b/rdf.storage.sparql/pom.xml
@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+<!--
+
+ 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.
+
+    -->
+
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.apache.clerezza</groupId>
+        <artifactId>clerezza</artifactId>
+        <version>0.5-SNAPSHOT</version>
+        <relativePath>../parent</relativePath>
+    </parent>
+    <artifactId>rdf.storage.sparql</artifactId>
+    <version>0.1-SNAPSHOT</version>
+    <packaging>bundle</packaging>
+    <name>Clerezza - SCB Sparql Storage Provider</name>
+    <description>A storage provider backed by a SPARQL endpoint.</description>
+    <dependencies>
+        <dependency>
+            <groupId>org.osgi</groupId>
+            <artifactId>org.osgi.compendium</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.osgi</groupId>
+            <artifactId>org.osgi.core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.clerezza</groupId>
+            <artifactId>rdf.ontologies</artifactId>
+            <version>0.12-SNAPSHOT</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.clerezza</groupId>
+            <artifactId>rdf.utils</artifactId>
+            <version>0.14-SNAPSHOT</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.clerezza</groupId>
+            <artifactId>rdf.scala.utils</artifactId>
+            <version>0.4-SNAPSHOT</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.clerezza</groupId>
+            <artifactId>osgi.services</artifactId>
+            <version>0.2-SNAPSHOT</version>
+        </dependency>
+        <dependency>
+            <groupId>org.scala-lang</groupId>
+            <artifactId>scala-library</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>javax.ws.rs</groupId>
+            <artifactId>jsr311-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.felix</groupId>
+            <artifactId>org.apache.felix.scr.annotations</artifactId>
+            <version>1.9.6</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.clerezza.ext</groupId>
+            <artifactId>slf4j-scala-api</artifactId>
+            <version>1.6.3-SNAPSHOT</version>
+        </dependency>
+    </dependencies>
+    <build>
+        <sourceDirectory>src/main/scala</sourceDirectory>
+        <testSourceDirectory>src/test/scala</testSourceDirectory>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-bundle-plugin</artifactId>
+                <version>2.4.0</version>
+                <extensions>true</extensions>
+                <configuration>
+                    <instructions>
+                        <Import-Package>org.osgi.*; version="[1,2)",javax.ws.rs.*; version="[1,3)",
+                            org.apache.stanbol.commons.security.*; version="[0,3)",
+                            !org.apache.felix.scr.annotations.*,*</Import-Package>
+                            <Bundle-SymbolicName>${project.groupId}.${project.artifactId}</Bundle-SymbolicName>
+                        <_nodefaultversion />
+                    </instructions>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-scr-plugin</artifactId>
+                <version>1.14.0</version>
+                <executions>
+                    <execution>
+                        <id>generate-scr-scrdescriptor</id>
+                        <goals>
+                            <goal>scr</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <scanClasses>true</scanClasses> 
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.scala-tools</groupId>
+                <artifactId>maven-scala-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/clerezza/blob/ea6a70ce/rdf.storage.sparql/src/main/scala/org/apache/clerezza/rdf/storage/sparql/SparqlStorageProvider.scala
----------------------------------------------------------------------
diff --git a/rdf.storage.sparql/src/main/scala/org/apache/clerezza/rdf/storage/sparql/SparqlStorageProvider.scala b/rdf.storage.sparql/src/main/scala/org/apache/clerezza/rdf/storage/sparql/SparqlStorageProvider.scala
new file mode 100644
index 0000000..14b006e
--- /dev/null
+++ b/rdf.storage.sparql/src/main/scala/org/apache/clerezza/rdf/storage/sparql/SparqlStorageProvider.scala
@@ -0,0 +1,252 @@
+/*
+ * 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.clerezza.rdf.storage.sparql
+
+import org.osgi.service.component.ComponentContext
+import java.io.IOException
+import java.net.{ HttpURLConnection, URL }
+import org.apache.clerezza.rdf.core.serializedform.SupportedFormat
+import org.apache.clerezza.rdf.core.serializedform.Parser
+import java.security.PrivilegedActionException
+import org.slf4j.scala._
+import org.apache.clerezza.rdf.core.access._
+import org.apache.clerezza.rdf.core.impl.AbstractMGraph
+import org.apache.clerezza.rdf.core._
+import scala.collection.JavaConversions.asScalaSet
+import java.util.Collection
+import java.util.Collections
+import org.apache.felix.scr.annotations.Component
+import org.apache.felix.scr.annotations.Service
+import org.apache.felix.scr.annotations.Property
+import java.net.URLEncoder
+import org.apache.clerezza.rdf.core.impl.TripleImpl
+import org.apache.clerezza.rdf.ontologies.RDF
+
+/**
+ * The Web Proxy Service enables applications to request remote (and local) graphs.
+ * It keeps cached version of the remote graphs in store for faster delivery.
+ *
+ */
+@Component
+@Service(Array(classOf[WeightedTcProvider]))
+class SparqlStorageProvider extends WeightedTcProvider with Logging {
+
+  final val queryEndpointKey = "query-endpoint"
+  @Property(name = queryEndpointKey, value = Array("http://localhost:3030/ds/query"))
+  private var queryEndpoint: String = _
+
+  final val updateEndpointKey = "update-endpoint"
+  @Property(name = updateEndpointKey, value = Array("http://localhost:3030/ds/update"))
+  private var updateEndpoint: String = _
+
+  final val metaGraphName = new UriRef("urn:x-internal:/meta")
+  final val mGraphClass = new UriRef("http://clerezza.apache.org/ontologies/storage#MGraph")
+
+  /**OSGI method, called on activation */
+  protected def activate(context: ComponentContext) = {
+    queryEndpoint = context.getProperties.get(queryEndpointKey).toString
+    updateEndpoint = context.getProperties.get(updateEndpointKey).toString
+  }
+
+  private var parser: Parser = null
+
+  protected def bindParser(p: Parser) = {
+    parser = p
+  }
+
+  protected def unbindParser(p: Parser) = {
+    parser = null
+  }
+
+  def getWeight: Int = {
+    return 20000
+  }
+
+  def getMGraph(name: UriRef): MGraph = {
+    checkMGraphExists(name)
+    getMGraphNoExistenceCheck(name)
+  }
+
+  /**
+   * throws NoSuchEntity if not existing
+   */
+  protected def checkMGraphExists(name: UriRef) {
+    val metaGraph = getMGraphNoExistenceCheck(metaGraphName)
+    if (!metaGraph.contains(new TripleImpl(name, RDF.`type`, mGraphClass))) {
+      throw new NoSuchEntityException(name)
+    }
+  }
+
+  protected def getMGraphNoExistenceCheck(name: UriRef): MGraph = {
+    return new AbstractMGraph() {
+      protected def performFilter(subject: NonLiteral, predicate: UriRef, obj: Resource): java.util.Iterator[Triple] = {
+        def ask = {
+          //TODO ask query
+          true
+        }
+        
+        val vars = new collection.mutable.ListBuffer[Char]
+        if (subject == null) vars += 's'
+        if (predicate == null) vars += 'p'
+        if (obj == null) vars += 'o'
+        if (vars.isEmpty() && ask()) {
+          Collections.singletonList(new TripleImpl(subject, predicate, obj)).iterator() 
+        } else {
+          val vs = vars.foldLeft[String]("")(((s,v) => s+" ?"+v+" "))
+        val query = "SELECT "+vs+" WHERE {" + SparqlStorageProvider.tpEncode(subject) +
+          " " + SparqlStorageProvider.tpEncode(predicate) + " " + SparqlStorageProvider.tpEncode(obj) + " } "
+        val url = new URL(queryEndpoint)
+        val con = url.openConnection().asInstanceOf[HttpURLConnection]
+        //not sure
+        System.out.println("DEBUG: doing output...")
+        con.setDoOutput(true)
+        con.setRequestMethod("POST")
+        val out = con.getOutputStream()
+        System.out.println("update:  " + update)
+        out.write(("update=" + URLEncoder.encode(update)).getBytes())
+        val err = con.getErrorStream()
+        if (err != null) {
+          var che = err.read
+          while (che != -1) {
+            System.out.write(che)
+            che = err.read
+          }
+        } else {
+          val in = con.getInputStream()
+          var ch = in.read
+          while (ch != -1) {
+            System.out.write(ch)
+            ch = in.read
+          }
+        }
+        System.out.flush
+        Collections.emptyList[Triple]().iterator()
+            }
+      }
+      override def add(triple: Triple) = {
+        val update = "INSERT DATA { GRAPH " + name + " {" + SparqlStorageProvider.tpEncode(triple.getSubject) +
+          " " + SparqlStorageProvider.tpEncode(triple.getPredicate) + " " + SparqlStorageProvider.tpEncode(triple.getObject) + " } }"
+        performUpdate(update)
+        true
+      }
+
+      def size = 0
+    }
+  }
+
+  protected def performUpdate(update: String) {
+    val url = new URL(updateEndpoint)
+    val con = url.openConnection().asInstanceOf[HttpURLConnection]
+    //not sure
+    System.out.println("DEBUG: doing output...")
+    con.setDoOutput(true)
+    con.setRequestMethod("POST")
+    val out = con.getOutputStream()
+    System.out.println("update:  " + update)
+    out.write(("update=" + URLEncoder.encode(update)).getBytes())
+    val err = con.getErrorStream()
+    if (err != null) {
+      var che = err.read
+      while (che != -1) {
+        System.out.write(che)
+        che = err.read
+      }
+    } else {
+      val in = con.getInputStream()
+      var ch = in.read
+      while (ch != -1) {
+        System.out.write(ch)
+        ch = in.read
+      }
+    }
+    System.out.flush
+  }
+
+  def getGraph(name: UriRef): Graph = {
+    throw new NoSuchEntityException(name)
+  }
+
+  def getTriples(name: UriRef): TripleCollection = {
+    return getMGraph(name)
+  }
+
+  def createMGraph(name: UriRef): MGraph = {
+    performUpdate("CREATE GRAPH " + name)
+    val metaGraph = getMGraphNoExistenceCheck(metaGraphName)
+    metaGraph.add(new TripleImpl(name, RDF.`type`, mGraphClass))
+    getMGraph(name)
+  }
+
+  def createGraph(name: UriRef, triples: TripleCollection): Graph = {
+    throw new UnsupportedOperationException
+  }
+
+  def deleteTripleCollection(name: UriRef): Unit = {
+    throw new UnsupportedOperationException
+  }
+
+  def getNames(graph: Graph): java.util.Set[UriRef] = {
+    return java.util.Collections.emptySet[UriRef]
+  }
+
+  def listTripleCollections: java.util.Set[UriRef] = {
+    var result: java.util.Set[UriRef] = new java.util.HashSet[UriRef]
+    result.addAll(listGraphs)
+    result.addAll(listMGraphs)
+    return result
+  }
+
+  def listGraphs: java.util.Set[UriRef] = {
+    //or should we list graphs for which we have a cached version?
+    return java.util.Collections.emptySet[UriRef]
+  }
+
+  def listMGraphs: java.util.Set[UriRef] = {
+    var result: java.util.Set[UriRef] = new java.util.HashSet[UriRef]
+    result.add(new UriRef("http://fake/sparql"))
+    result.add(new UriRef(queryEndpoint))
+    result.add(new UriRef(updateEndpoint))
+    return result
+
+  }
+}
+object SparqlStorageProvider {
+  private def tpEncode(res: Resource): String =
+    res match {
+      case l: Literal => tpEncode(l)
+      case u: UriRef => u.toString()
+      case b: BNode => tpEncode(b)
+    }
+
+  private def tpEncode(lit: Literal): String =
+    lit match {
+      case l: PlainLiteral if (l.getLanguage() == null) => "\"\"\"" + l.getLexicalForm() + "\"\"\""
+      case l: PlainLiteral if (l.getLanguage() != null) => "\"\"\"" + l.getLexicalForm() + "\"\"\"@" + l.getLanguage()
+      case l: TypedLiteral => "\"\"\"" + l.getLexicalForm() + "\"\"\"^^" + l.getDataType()
+    }
+
+  private def tpEncode(bNode: BNode): String =
+    //if the bNode has previously been retuned by SPARQL we should add 
+    //TriplePatterns so that the right one is identified
+    //If this is one that is newly added we must make sure the subsequentyl added
+    //statements get added, as long as a newly added bNode doesn't add
+    //new information (would cause a non-lean graph) it is not added to the graph
+    "_:"
+}