| /* |
| * 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.rya.api.query.strategy.wholerow; |
| |
| import static org.apache.rya.api.RdfCloudTripleStoreConstants.DELIM_BYTES; |
| import static org.apache.rya.api.RdfCloudTripleStoreConstants.LAST_BYTES; |
| import static org.apache.rya.api.RdfCloudTripleStoreConstants.TYPE_DELIM_BYTES; |
| |
| import java.io.IOException; |
| import java.nio.charset.StandardCharsets; |
| import java.util.Map; |
| |
| import org.apache.rya.api.RdfCloudTripleStoreConfiguration; |
| import org.apache.rya.api.RdfCloudTripleStoreConstants; |
| import org.apache.rya.api.RdfCloudTripleStoreUtils; |
| import org.apache.rya.api.domain.RyaRange; |
| import org.apache.rya.api.domain.RyaType; |
| import org.apache.rya.api.domain.RyaIRI; |
| import org.apache.rya.api.query.strategy.AbstractTriplePatternStrategy; |
| import org.apache.rya.api.query.strategy.ByteRange; |
| import org.apache.rya.api.resolver.RyaContext; |
| import org.apache.rya.api.resolver.RyaTypeResolverException; |
| |
| import com.google.common.primitives.Bytes; |
| |
| /** |
| * Date: 7/14/12 |
| * Time: 7:35 AM |
| */ |
| public class PoWholeRowTriplePatternStrategy extends AbstractTriplePatternStrategy { |
| |
| @Override |
| public RdfCloudTripleStoreConstants.TABLE_LAYOUT getLayout() { |
| return RdfCloudTripleStoreConstants.TABLE_LAYOUT.PO; |
| } |
| |
| @Override |
| public Map.Entry<RdfCloudTripleStoreConstants.TABLE_LAYOUT, |
| ByteRange> defineRange(final RyaIRI subject, final RyaIRI predicate, final RyaType object, |
| final RyaIRI context, final RdfCloudTripleStoreConfiguration conf) throws IOException { |
| try { |
| //po(ng) |
| //po_r(s)(ng) |
| //p(ng) |
| //p_r(o)(ng) |
| //r(p)(ng) |
| if (!handles(subject, predicate, object, context)) { |
| return null; |
| } |
| |
| final RyaContext ryaContext = RyaContext.getInstance(); |
| |
| final RdfCloudTripleStoreConstants.TABLE_LAYOUT table_layout = RdfCloudTripleStoreConstants.TABLE_LAYOUT.PO; |
| byte[] start, stop; |
| if (object != null) { |
| if (object instanceof RyaRange) { |
| //p_r(o) |
| RyaRange rv = (RyaRange) object; |
| rv = ryaContext.transformRange(rv); |
| final byte[] objStartBytes = ryaContext.serializeType(rv.getStart())[0]; |
| final byte[] objEndBytes = ryaContext.serializeType(rv.getStop())[0]; |
| final byte[] predBytes = predicate.getData().getBytes(StandardCharsets.UTF_8); |
| start = Bytes.concat(predBytes, DELIM_BYTES, objStartBytes); |
| stop = Bytes.concat(predBytes, DELIM_BYTES, objEndBytes, DELIM_BYTES, LAST_BYTES); |
| } else { |
| if (subject != null && subject instanceof RyaRange) { |
| //po_r(s) |
| RyaRange ru = (RyaRange) subject; |
| ru = ryaContext.transformRange(ru); |
| final byte[] subjStartBytes = ru.getStart().getData().getBytes(StandardCharsets.UTF_8); |
| final byte[] subjStopBytes = ru.getStop().getData().getBytes(StandardCharsets.UTF_8); |
| final byte[] predBytes = predicate.getData().getBytes(StandardCharsets.UTF_8); |
| final byte[] objBytes = ryaContext.serializeType(object)[0]; |
| start = Bytes.concat(predBytes, DELIM_BYTES, objBytes, DELIM_BYTES, subjStartBytes); |
| stop = Bytes.concat(predBytes, DELIM_BYTES, objBytes, DELIM_BYTES, subjStopBytes, TYPE_DELIM_BYTES, LAST_BYTES); |
| } else { |
| //po |
| //TODO: There must be a better way than creating multiple byte[] |
| final byte[] objBytes = ryaContext.serializeType(object)[0]; |
| start = Bytes.concat(predicate.getData().getBytes(StandardCharsets.UTF_8), DELIM_BYTES, objBytes, DELIM_BYTES); |
| stop = Bytes.concat(start, LAST_BYTES); |
| } |
| } |
| } else if (predicate instanceof RyaRange) { |
| //r(p) |
| RyaRange rv = (RyaRange) predicate; |
| rv = ryaContext.transformRange(rv); |
| start = rv.getStart().getData().getBytes(StandardCharsets.UTF_8); |
| stop = Bytes.concat(rv.getStop().getData().getBytes(StandardCharsets.UTF_8), DELIM_BYTES, LAST_BYTES); |
| } else { |
| //p |
| start = Bytes.concat(predicate.getData().getBytes(StandardCharsets.UTF_8), DELIM_BYTES); |
| stop = Bytes.concat(start, LAST_BYTES); |
| } |
| return new RdfCloudTripleStoreUtils.CustomEntry<RdfCloudTripleStoreConstants.TABLE_LAYOUT, |
| ByteRange>(table_layout, new ByteRange(start, stop)); |
| } catch (final RyaTypeResolverException e) { |
| throw new IOException(e); |
| } |
| } |
| |
| @Override |
| public boolean handles(final RyaIRI subject, final RyaIRI predicate, final RyaType object, final RyaIRI context) { |
| //po(ng) |
| //p_r(o)(ng) |
| //po_r(s)(ng) |
| //p(ng) |
| //r(p)(ng) |
| if (predicate == null) { |
| return false; |
| } |
| if (subject != null && !(subject instanceof RyaRange)) { |
| return false; |
| } |
| if (predicate instanceof RyaRange) { |
| return object == null && subject == null; |
| } |
| return subject == null || object != null; |
| } |
| } |