svn commit: r908983 - /incubator/clerezza/trunk/org.apache.clerezza.parent/org.apache.clerezza.rdf.utils/src/main/java/org/apache/clerezza/rdf/utils/UriMutatingTripleCollection.java

[re...@apache.org]

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.");
+		}
+
+	}
+}