Author: reto
Date: Thu Feb 11 14:13:19 2010
New Revision: 908983
URL: http://svn.apache.org/viewvc?rev=908983&view=rev
Log:
CLEREZZA-117: UriMutatingTripleCollection added
Added:
incubator/clerezza/trunk/org.apache.clerezza.parent/org.apache.clerezza.rdf.utils/src/main/java/org/apache/clerezza/rdf/utils/UriMutatingTripleCollection.java
Added:
incubator/clerezza/trunk/org.apache.clerezza.parent/org.apache.clerezza.rdf.utils/src/main/java/org/apache/clerezza/rdf/utils/UriMutatingTripleCollection.java
URL:
http://svn.apache.org/viewvc/incubator/clerezza/trunk/org.apache.clerezza.parent/org.apache.clerezza.rdf.utils/src/main/java/org/apache/clerezza/rdf/utils/UriMutatingTripleCollection.java?rev=908983&view=auto
==============================================================================
---
incubator/clerezza/trunk/org.apache.clerezza.parent/org.apache.clerezza.rdf.utils/src/main/java/org/apache/clerezza/rdf/utils/UriMutatingTripleCollection.java
(added)
+++
incubator/clerezza/trunk/org.apache.clerezza.parent/org.apache.clerezza.rdf.utils/src/main/java/org/apache/clerezza/rdf/utils/UriMutatingTripleCollection.java
Thu Feb 11 14:13:19 2010
@@ -0,0 +1,222 @@
+/*
+ * 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.utils;
+
+import java.util.Collection;
+import java.util.Iterator;
+import org.apache.clerezza.rdf.core.NonLiteral;
+import org.apache.clerezza.rdf.core.Resource;
+import org.apache.clerezza.rdf.core.Triple;
+import org.apache.clerezza.rdf.core.TripleCollection;
+import org.apache.clerezza.rdf.core.UriRef;
+import org.apache.clerezza.rdf.core.event.FilterTriple;
+import org.apache.clerezza.rdf.core.event.GraphListener;
+import org.apache.clerezza.rdf.core.impl.TripleImpl;
+
+/**
+ * This wrapps a Triplecollection changing a prefix for the UriRefs contained
+ * in subject or object position.
+ *
+ * Currently it only supports read opearations.
+ *
+ * @author reto
+ */
+public class UriMutatingTripleCollection implements TripleCollection {
+
+ private final TripleCollection base;
+ private final String sourcePrefix;
+ private final String targetPrefix;
+ private final int sourcePrefixLength;
+ private final int targetPrefixLength;
+
+ public UriMutatingTripleCollection(TripleCollection base, String
sourcePrefix,
+ String targetPrefix) {
+ this.base = base;
+ this.sourcePrefix = sourcePrefix;
+ sourcePrefixLength= sourcePrefix.length();
+ this.targetPrefix = targetPrefix;
+ targetPrefixLength= targetPrefix.length();
+ }
+
+ private <R extends Resource> R toTargetResource(final R sourceResource)
{
+ if (sourceResource instanceof UriRef) {
+ final UriRef sourceUriRef = (UriRef) sourceResource;
+ if
(sourceUriRef.getUnicodeString().startsWith(sourcePrefix)) {
+ final String uriRest =
sourceUriRef.getUnicodeString()
+ .substring(sourcePrefixLength);
+ return (R) new UriRef(targetPrefix+uriRest);
+ }
+ }
+ return sourceResource;
+ }
+
+ private Triple toTargetTriple(Triple triple) {
+ if (triple == null) {
+ return null;
+ }
+ return new TripleImpl(toTargetResource(triple.getSubject()),
+ triple.getPredicate(),
toTargetResource(triple.getObject()));
+ }
+
+ private <R extends Resource> R toSourceResource(final R targetResource)
{
+ if (targetResource instanceof UriRef) {
+ final UriRef sourceUriRef = (UriRef) targetResource;
+ if
(sourceUriRef.getUnicodeString().startsWith(targetPrefix)) {
+ final String uriRest =
sourceUriRef.getUnicodeString()
+ .substring(targetPrefixLength);
+ return (R) new UriRef(sourcePrefix+uriRest);
+ }
+ }
+ return targetResource;
+ }
+
+ private Triple toSourceTriple(Triple triple) {
+ if (triple == null) {
+ return null;
+ }
+ return new TripleImpl(toSourceResource(triple.getSubject()),
+ triple.getPredicate(),
toSourceResource(triple.getObject()));
+ }
+
+ @Override
+ public Iterator<Triple> filter(NonLiteral subject, UriRef predicate,
Resource object) {
+ final Iterator<Triple> baseIter =
base.filter(toSourceResource(subject),
+ predicate, toSourceResource(object));
+ return new WrappedIteraror(baseIter);
+
+
+ }
+
+ @Override
+ public void addGraphListener(GraphListener listener, FilterTriple
filter, long delay) {
+ }
+
+ @Override
+ public void addGraphListener(GraphListener listener, FilterTriple
filter) {
+ }
+
+ @Override
+ public void removeGraphListener(GraphListener listener) {
+ }
+
+ @Override
+ public int size() {
+ return base.size();
+ }
+
+ @Override
+ public boolean isEmpty() {
+ return base.isEmpty();
+ }
+
+ @Override
+ public boolean contains(Object o) {
+ return base.contains(toSourceTriple((Triple)o));
+ }
+
+ @Override
+ public Iterator<Triple> iterator() {
+ return filter(null, null, null);
+ }
+
+ @Override
+ public Object[] toArray() {
+ Object[] result = base.toArray();
+ for (int i = 0; i < result.length; i++) {
+ Triple triple = (Triple) result[i];
+ result[i] = toTargetTriple(triple);
+ }
+ return result;
+ }
+
+ @Override
+ public <T> T[] toArray(T[] a) {
+ T[] result = base.toArray(a);
+ for (int i = 0; i < result.length; i++) {
+ Triple triple = (Triple) result[i];
+ result[i] = (T) toTargetTriple(triple);
+ }
+ return result;
+ }
+
+ @Override
+ public boolean add(Triple e) {
+ throw new UnsupportedOperationException("Not supported.");
+ }
+
+ @Override
+ public boolean remove(Object o) {
+ throw new UnsupportedOperationException("Not supported.");
+ }
+
+ @Override
+ public boolean containsAll(Collection<?> c) {
+ for (Object object : c) {
+ if (!contains(object)) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ @Override
+ public boolean addAll(Collection<? extends Triple> c) {
+ throw new UnsupportedOperationException("Not supported.");
+ }
+
+ @Override
+ public boolean removeAll(Collection<?> c) {
+ throw new UnsupportedOperationException("Not supported.");
+ }
+
+ @Override
+ public boolean retainAll(Collection<?> c) {
+ throw new UnsupportedOperationException("Not supported.");
+ }
+
+ @Override
+ public void clear() {
+ throw new UnsupportedOperationException("Not supported.");
+ }
+
+ class WrappedIteraror implements Iterator<Triple>{
+ private final Iterator<Triple> baseIter;
+
+ private WrappedIteraror(Iterator<Triple> baseIter) {
+ this.baseIter = baseIter;
+ }
+
+ @Override
+ public boolean hasNext() {
+ return baseIter.hasNext();
+ }
+
+ @Override
+ public Triple next() {
+ return toTargetTriple(baseIter.next());
+ }
+
+ @Override
+ public void remove() {
+ throw new UnsupportedOperationException("Not supported
yet.");
+ }
+
+ }
+}
