| /* |
| * 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.strings; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import org.apache.vxquery.datamodel.accessors.SequencePointable; |
| import org.apache.vxquery.datamodel.accessors.TaggedValuePointable; |
| 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.apache.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator; |
| import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory; |
| import org.apache.hyracks.api.context.IHyracksTaskContext; |
| import org.apache.hyracks.data.std.api.IPointable; |
| import org.apache.hyracks.data.std.primitive.UTF8StringPointable; |
| import org.apache.hyracks.data.std.util.ArrayBackedValueStorage; |
| |
| public class FnStringJoinEvaluatorFactory extends AbstractTaggedValueArgumentScalarEvaluatorFactory { |
| private static final long serialVersionUID = 1L; |
| |
| public FnStringJoinEvaluatorFactory(IScalarEvaluatorFactory[] args) { |
| super(args); |
| } |
| |
| @Override |
| protected IScalarEvaluator createEvaluator(IHyracksTaskContext ctx, IScalarEvaluator[] args) |
| throws AlgebricksException { |
| final TaggedValuePointable tvp = new TaggedValuePointable(); |
| final UTF8StringPointable stringp1 = (UTF8StringPointable) UTF8StringPointable.FACTORY.createPointable(); |
| final UTF8StringPointable stringp2 = (UTF8StringPointable) UTF8StringPointable.FACTORY.createPointable(); |
| final ArrayBackedValueStorage abvs = new ArrayBackedValueStorage(); |
| final SequencePointable seq = (SequencePointable) SequencePointable.FACTORY.createPointable(); |
| |
| return new AbstractTaggedValueArgumentScalarEvaluator(args) { |
| @Override |
| protected void evaluate(TaggedValuePointable[] args, IPointable result) throws SystemException { |
| abvs.reset(); |
| |
| TaggedValuePointable tvp1 = args[0]; |
| TaggedValuePointable tvp2 = args[1]; |
| |
| // Only accept a sequence of strings and a string. |
| if (!FunctionHelper.isDerivedFromString(tvp2.getTag())) { |
| throw new SystemException(ErrorCode.FORG0006); |
| } |
| if (FunctionHelper.isDerivedFromString(tvp1.getTag())) { |
| try { |
| // Return first parameter as a string. |
| DataOutput out = abvs.getDataOutput(); |
| tvp1.getValue(stringp1); |
| out.write(ValueTag.XS_STRING_TAG); |
| out.write(stringp1.getByteArray(), stringp1.getStartOffset(), stringp1.getLength()); |
| result.set(abvs.getByteArray(), abvs.getStartOffset(), abvs.getLength()); |
| } catch (IOException e) { |
| throw new SystemException(ErrorCode.SYSE0001, e); |
| } |
| return; |
| } else if (tvp1.getTag() != ValueTag.SEQUENCE_TAG) { |
| throw new SystemException(ErrorCode.FORG0006); |
| } |
| |
| // Operate on a sequence. |
| tvp1.getValue(seq); |
| tvp2.getValue(stringp2); |
| |
| try { |
| // Byte Format: Type (1 byte) + String Length (2 bytes) + String. |
| DataOutput out = abvs.getDataOutput(); |
| out.write(ValueTag.XS_STRING_TAG); |
| |
| // Default values for the length and update later |
| out.write(0); |
| out.write(0); |
| |
| int seqLen = seq.getEntryCount(); |
| if (seqLen != 0) { |
| for (int j = 0; j < seqLen; ++j) { |
| // Add separator if more than one value. |
| if (j > 0) { |
| out.write(stringp2.getByteArray(), stringp2.getStartOffset() + 2, |
| stringp2.getUTFLength()); |
| } |
| // Get string from sequence. |
| seq.getEntry(j, tvp); |
| if (!FunctionHelper.isDerivedFromString(tvp.getTag())) { |
| throw new SystemException(ErrorCode.FORG0006); |
| } |
| tvp.getValue(stringp1); |
| out.write(stringp1.getByteArray(), stringp1.getStartOffset() + 2, stringp1.getUTFLength()); |
| } |
| |
| // Update the full length string in the byte array. |
| abvs.getByteArray()[1] = (byte) (((abvs.getLength() - 3) >>> 8) & 0xFF); |
| abvs.getByteArray()[2] = (byte) (((abvs.getLength() - 3) >>> 0) & 0xFF); |
| } |
| |
| result.set(abvs.getByteArray(), abvs.getStartOffset(), abvs.getLength()); |
| } catch (IOException e) { |
| throw new SystemException(ErrorCode.SYSE0001, e); |
| } |
| } |
| }; |
| } |
| } |