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Olaf Hartig
committed
separated non-Jena data related stuff out of TriplePatternFragmentImpl into TriplePatternFragmentBase
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+142
-91
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2 files changed

+142
-91
lines changed

‎src/org/linkeddatafragments/fragments/tpf/TriplePatternFragmentBase.java

Lines changed: 136 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,136 @@
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package org.linkeddatafragments.fragments.tpf;
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import java.util.NoSuchElementException;
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import org.linkeddatafragments.fragments.LinkedDataFragmentBase;
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import org.linkeddatafragments.util.CommonResources;
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import com.hp.hpl.jena.datatypes.xsd.XSDDatatype;
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import com.hp.hpl.jena.rdf.model.Literal;
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import com.hp.hpl.jena.rdf.model.Model;
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import com.hp.hpl.jena.rdf.model.Resource;
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import com.hp.hpl.jena.rdf.model.Statement;
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import com.hp.hpl.jena.rdf.model.StmtIterator;
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import com.hp.hpl.jena.util.iterator.NiceIterator;
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/**
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* Base class for implementations of {@link TriplePatternFragment}.
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*
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* @author Ruben Verborgh
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* @author <a href="http://olafhartig.de">Olaf Hartig</a>
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*/
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abstract public class TriplePatternFragmentBase extends LinkedDataFragmentBase
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implements TriplePatternFragment
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{
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private final long totalSize;
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/**
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* Creates an empty Triple Pattern Fragment.
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*/
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public TriplePatternFragmentBase( final String fragmentURL,
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final String datasetURL ) {
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this( 0L, fragmentURL, datasetURL, 1, true );
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}
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/**
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* Creates an empty Triple Pattern Fragment page.
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*/
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public TriplePatternFragmentBase( final String fragmentURL,
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final String datasetURL,
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final long pageNumber,
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final boolean isLastPage ) {
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this( 0L, fragmentURL, datasetURL, pageNumber, isLastPage );
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}
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/**
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* Creates a new Triple Pattern Fragment.
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* @param totalSize the total size
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*/
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public TriplePatternFragmentBase( long totalSize,
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final String fragmentURL,
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final String datasetURL,
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final long pageNumber,
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final boolean isLastPage ) {
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super( fragmentURL, datasetURL, pageNumber, isLastPage );
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this.totalSize = totalSize < 0L ? 0L : totalSize;
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}
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@Override
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public StmtIterator getTriples() {
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if ( totalSize == 0L )
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return emptyStmtIterator;
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else
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return getNonEmptyStmtIterator();
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}
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abstract protected StmtIterator getNonEmptyStmtIterator();
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@Override
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public long getTotalSize() {
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return totalSize;
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}
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@Override
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public void addMetadata( final Model model )
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{
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super.addMetadata( model );
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final Resource fragmentId = model.createResource( fragmentURL );
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final Literal totalTyped = model.createTypedLiteral( totalSize,
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XSDDatatype.XSDinteger );
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final Literal limitTyped = model.createTypedLiteral( getMaxPageSize(),
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XSDDatatype.XSDinteger );
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fragmentId.addLiteral( CommonResources.VOID_TRIPLES, totalTyped );
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fragmentId.addLiteral( CommonResources.HYDRA_TOTALITEMS, totalTyped );
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fragmentId.addLiteral( CommonResources.HYDRA_ITEMSPERPAGE, limitTyped );
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}
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@Override
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public void addControls( final Model model )
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{
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super.addControls( model );
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final Resource datasetId = model.createResource( getDatasetURI() );
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final Resource triplePattern = model.createResource();
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final Resource subjectMapping = model.createResource();
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final Resource predicateMapping = model.createResource();
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final Resource objectMapping = model.createResource();
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datasetId.addProperty( CommonResources.HYDRA_SEARCH, triplePattern );
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triplePattern.addProperty( CommonResources.HYDRA_TEMPLATE, getTemplate() );
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triplePattern.addProperty( CommonResources.HYDRA_MAPPING, subjectMapping );
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triplePattern.addProperty( CommonResources.HYDRA_MAPPING, predicateMapping );
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triplePattern.addProperty( CommonResources.HYDRA_MAPPING, objectMapping );
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subjectMapping.addProperty( CommonResources.HYDRA_VARIABLE, TriplePatternFragmentRequest.PARAMETERNAME_SUBJ );
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subjectMapping.addProperty( CommonResources.HYDRA_PROPERTY, CommonResources.RDF_SUBJECT );
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predicateMapping.addProperty( CommonResources.HYDRA_VARIABLE, TriplePatternFragmentRequest.PARAMETERNAME_PRED );
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predicateMapping.addProperty( CommonResources.HYDRA_PROPERTY, CommonResources.RDF_PREDICATE );
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objectMapping.addProperty( CommonResources.HYDRA_VARIABLE, TriplePatternFragmentRequest.PARAMETERNAME_OBJ );
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objectMapping.addProperty( CommonResources.HYDRA_PROPERTY, CommonResources.RDF_OBJECT );
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}
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public String getTemplate() {
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return datasetURL + "{?" +
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TriplePatternFragmentRequest.PARAMETERNAME_SUBJ + "," +
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TriplePatternFragmentRequest.PARAMETERNAME_PRED + "," +
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TriplePatternFragmentRequest.PARAMETERNAME_OBJ + "}";
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}
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public static final StmtIterator emptyStmtIterator = new EmptyStmtIterator();
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public static class EmptyStmtIterator
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extends NiceIterator<Statement>
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implements StmtIterator
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{
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public Statement nextStatement() { throw new NoSuchElementException(); }
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}
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}

‎src/org/linkeddatafragments/fragments/tpf/TriplePatternFragmentImpl.java

Lines changed: 6 additions & 91 deletions
Original file line numberDiff line numberDiff line change
@@ -1,29 +1,16 @@
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package org.linkeddatafragments.fragments.tpf;
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import java.util.NoSuchElementException;
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import org.linkeddatafragments.fragments.LinkedDataFragmentBase;
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import org.linkeddatafragments.util.CommonResources;
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import com.hp.hpl.jena.datatypes.xsd.XSDDatatype;
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import com.hp.hpl.jena.rdf.model.Literal;
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import com.hp.hpl.jena.rdf.model.Model;
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import com.hp.hpl.jena.rdf.model.Resource;
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import com.hp.hpl.jena.rdf.model.Statement;
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import com.hp.hpl.jena.rdf.model.StmtIterator;
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import com.hp.hpl.jena.util.iterator.NiceIterator;
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/**
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* Implementation of {@link TriplePatternFragment}.
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*
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* @author Ruben Verborgh
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* @author <a href="http://olafhartig.de">Olaf Hartig</a>
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*/
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public class TriplePatternFragmentImpl extends LinkedDataFragmentBase
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implements TriplePatternFragment
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public class TriplePatternFragmentImpl extends TriplePatternFragmentBase
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{
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private final Model triples;
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private final long totalSize;
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protected final Model triples;
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/**
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* Creates an empty Triple Pattern Fragment.
@@ -48,91 +35,19 @@ public TriplePatternFragmentImpl( final String fragmentURL,
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* @param triples the triples (possibly partial)
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* @param totalSize the total size
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*/
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public TriplePatternFragmentImpl( Model triples,
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public TriplePatternFragmentImpl( final Model triples,
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long totalSize,
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final String fragmentURL,
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final String datasetURL,
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final long pageNumber,
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final boolean isLastPage ) {
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super( fragmentURL, datasetURL, pageNumber, isLastPage );
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super( totalSize, fragmentURL, datasetURL, pageNumber, isLastPage );
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this.triples = triples;
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this.totalSize = totalSize < 0 ? 0 : totalSize;
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}
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@Override
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public StmtIterator getTriples() {
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if ( triples != null )
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return triples.listStatements();
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else
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return emptyStmtIterator;
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}
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@Override
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public long getTotalSize() {
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return totalSize;
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}
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@Override
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public void addMetadata( final Model model )
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{
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super.addMetadata( model );
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final Resource fragmentId = model.createResource( fragmentURL );
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final Literal totalTyped = model.createTypedLiteral( totalSize,
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XSDDatatype.XSDinteger );
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final Literal limitTyped = model.createTypedLiteral( getMaxPageSize(),
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XSDDatatype.XSDinteger );
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fragmentId.addLiteral( CommonResources.VOID_TRIPLES, totalTyped );
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fragmentId.addLiteral( CommonResources.HYDRA_TOTALITEMS, totalTyped );
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fragmentId.addLiteral( CommonResources.HYDRA_ITEMSPERPAGE, limitTyped );
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}
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@Override
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public void addControls( final Model model )
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{
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super.addControls( model );
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final Resource datasetId = model.createResource( getDatasetURI() );
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final Resource triplePattern = model.createResource();
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final Resource subjectMapping = model.createResource();
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final Resource predicateMapping = model.createResource();
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final Resource objectMapping = model.createResource();
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datasetId.addProperty( CommonResources.HYDRA_SEARCH, triplePattern );
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triplePattern.addProperty( CommonResources.HYDRA_TEMPLATE, getTemplate() );
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triplePattern.addProperty( CommonResources.HYDRA_MAPPING, subjectMapping );
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triplePattern.addProperty( CommonResources.HYDRA_MAPPING, predicateMapping );
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triplePattern.addProperty( CommonResources.HYDRA_MAPPING, objectMapping );
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subjectMapping.addProperty( CommonResources.HYDRA_VARIABLE, TriplePatternFragmentRequest.PARAMETERNAME_SUBJ );
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subjectMapping.addProperty( CommonResources.HYDRA_PROPERTY, CommonResources.RDF_SUBJECT );
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predicateMapping.addProperty( CommonResources.HYDRA_VARIABLE, TriplePatternFragmentRequest.PARAMETERNAME_PRED );
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predicateMapping.addProperty( CommonResources.HYDRA_PROPERTY, CommonResources.RDF_PREDICATE );
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objectMapping.addProperty( CommonResources.HYDRA_VARIABLE, TriplePatternFragmentRequest.PARAMETERNAME_OBJ );
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objectMapping.addProperty( CommonResources.HYDRA_PROPERTY, CommonResources.RDF_OBJECT );
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}
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public String getTemplate() {
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return datasetURL + "{?" +
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TriplePatternFragmentRequest.PARAMETERNAME_SUBJ + "," +
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TriplePatternFragmentRequest.PARAMETERNAME_PRED + "," +
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TriplePatternFragmentRequest.PARAMETERNAME_OBJ + "}";
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}
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public static final StmtIterator emptyStmtIterator = new EmptyStmtIterator();
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public static class EmptyStmtIterator
132-
extends NiceIterator<Statement>
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implements StmtIterator
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{
135-
public Statement nextStatement() { throw new NoSuchElementException(); }
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protected StmtIterator getNonEmptyStmtIterator() {
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return triples.listStatements();
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}
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}

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