/*
* 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.vxquery.runtime.functions.node;
import java.io.DataInputStream;
import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Arrays;
import org.apache.vxquery.datamodel.accessors.TaggedValuePointable;
import org.apache.vxquery.datamodel.builders.sequence.SequenceBuilder;
import org.apache.vxquery.datamodel.values.ValueTag;
import org.apache.vxquery.exceptions.ErrorCode;
import org.apache.vxquery.exceptions.SystemException;
import org.apache.vxquery.runtime.functions.base.AbstractTaggedValueArgumentScalarEvaluator;
import org.apache.vxquery.runtime.functions.base.AbstractTaggedValueArgumentScalarEvaluatorFactory;
import org.apache.vxquery.runtime.functions.util.FunctionHelper;
import org.xml.sax.InputSource;
import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
import edu.uci.ics.hyracks.algebricks.runtime.base.IScalarEvaluator;
import edu.uci.ics.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
import edu.uci.ics.hyracks.data.std.api.IPointable;
import edu.uci.ics.hyracks.data.std.primitive.UTF8StringPointable;
import edu.uci.ics.hyracks.data.std.util.ArrayBackedValueStorage;
import edu.uci.ics.hyracks.dataflow.common.comm.util.ByteBufferInputStream;
public class FnCollectionScalarEvaluatorFactory extends AbstractTaggedValueArgumentScalarEvaluatorFactory {
private static final long serialVersionUID = 1L;
public FnCollectionScalarEvaluatorFactory(IScalarEvaluatorFactory[] args) {
super(args);
}
@Override
protected IScalarEvaluator createEvaluator(IHyracksTaskContext ctx, IScalarEvaluator[] args)
throws AlgebricksException {
final ArrayBackedValueStorage abvs = new ArrayBackedValueStorage();
final UTF8StringPointable stringp = (UTF8StringPointable) UTF8StringPointable.FACTORY.createPointable();
final TaggedValuePointable nodep = (TaggedValuePointable) TaggedValuePointable.FACTORY.createPointable();
final ByteBufferInputStream bbis = new ByteBufferInputStream();
final DataInputStream di = new DataInputStream(bbis);
final SequenceBuilder sb = new SequenceBuilder();
final ArrayBackedValueStorage abvsFileNode = new ArrayBackedValueStorage();
final InputSource in = new InputSource();
return new AbstractTaggedValueArgumentScalarEvaluator(args) {
@Override
protected void evaluate(TaggedValuePointable[] args, IPointable result) throws SystemException {
TaggedValuePointable tvp = args[0];
// TODO add support empty sequence and no argument.
if (tvp.getTag() != ValueTag.XS_STRING_TAG) {
throw new SystemException(ErrorCode.FORG0006);
}
tvp.getValue(stringp);
try {
// Get the list of files.
bbis.setByteBuffer(ByteBuffer.wrap(Arrays.copyOfRange(stringp.getByteArray(),
stringp.getStartOffset(), stringp.getLength() + stringp.getStartOffset())), 0);
String collectionName = di.readUTF();
File collectionDirectory = new File(collectionName);
File[] list = collectionDirectory.listFiles();
abvs.reset();
sb.reset(abvs);
for (int i = 0; i < list.length; ++i) {
// Add the document node to the sequence.
abvsFileNode.reset();
FunctionHelper.readInDocFromString(list[i].getPath(), in, abvsFileNode);
nodep.set(abvsFileNode.getByteArray(), abvsFileNode.getStartOffset(), abvsFileNode.getLength());
sb.addItem(nodep);
}
sb.finish();
result.set(abvs);
} catch (IOException e) {
throw new SystemException(ErrorCode.SYSE0001, e);
}
}
};
}
}