| /* |
| * Copyright 2009-2011 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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 edu.uci.ics.asterix.runtime.evaluators.constructors; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import edu.uci.ics.asterix.common.functions.FunctionConstants; |
| import edu.uci.ics.asterix.formats.nontagged.AqlBinaryComparatorFactoryProvider; |
| import edu.uci.ics.asterix.formats.nontagged.AqlSerializerDeserializerProvider; |
| import edu.uci.ics.asterix.om.base.AFloat; |
| import edu.uci.ics.asterix.om.base.AMutableFloat; |
| import edu.uci.ics.asterix.om.base.ANull; |
| import edu.uci.ics.asterix.om.functions.IFunctionDescriptor; |
| import edu.uci.ics.asterix.om.functions.IFunctionDescriptorFactory; |
| import edu.uci.ics.asterix.om.types.ATypeTag; |
| import edu.uci.ics.asterix.om.types.BuiltinType; |
| import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory; |
| import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator; |
| import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer; |
| import edu.uci.ics.hyracks.data.std.api.IDataOutputProvider; |
| import edu.uci.ics.hyracks.data.std.util.ArrayBackedValueStorage; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference; |
| |
| public class AFloatConstructorDescriptor extends AbstractScalarFunctionDynamicDescriptor { |
| |
| private static final long serialVersionUID = 1L; |
| public final static FunctionIdentifier FID = new FunctionIdentifier(FunctionConstants.ASTERIX_NS, "float", 1); |
| private final static byte SER_STRING_TYPE_TAG = ATypeTag.STRING.serialize(); |
| private final static byte SER_NULL_TYPE_TAG = ATypeTag.NULL.serialize(); |
| public static final IFunctionDescriptorFactory FACTORY = new IFunctionDescriptorFactory() { |
| public IFunctionDescriptor createFunctionDescriptor() { |
| return new AFloatConstructorDescriptor(); |
| } |
| }; |
| |
| @Override |
| public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) { |
| return new ICopyEvaluatorFactory() { |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException { |
| return new ICopyEvaluator() { |
| |
| private DataOutput out = output.getDataOutput(); |
| private ArrayBackedValueStorage outInput = new ArrayBackedValueStorage(); |
| private ICopyEvaluator eval = args[0].createEvaluator(outInput); |
| private String errorMessage = "This can not be an instance of float"; |
| private final byte[] POSITIVE_INF = { 0, 3, 'I', 'N', 'F' }; |
| private final byte[] NEGATIVE_INF = { 0, 4, '-', 'I', 'N', 'F' }; |
| private final byte[] NAN = { 0, 3, 'N', 'a', 'N' }; |
| // private int offset = 3, value = 0, pointIndex = 0, eIndex |
| // = 1; |
| // private int integerPart = 0, fractionPart = 0, |
| // exponentPart = 0; |
| // float floatValue = 0; |
| // boolean positiveInteger = true, positiveExponent = true, |
| // expectingInteger = true, |
| // expectingFraction = false, expectingExponent = false; |
| IBinaryComparator utf8BinaryComparator = AqlBinaryComparatorFactoryProvider.UTF8STRING_POINTABLE_INSTANCE |
| .createBinaryComparator(); |
| private AMutableFloat aFloat = new AMutableFloat(0); |
| @SuppressWarnings("unchecked") |
| private ISerializerDeserializer<AFloat> floatSerde = AqlSerializerDeserializerProvider.INSTANCE |
| .getSerializerDeserializer(BuiltinType.AFLOAT); |
| @SuppressWarnings("unchecked") |
| private ISerializerDeserializer<ANull> nullSerde = AqlSerializerDeserializerProvider.INSTANCE |
| .getSerializerDeserializer(BuiltinType.ANULL); |
| |
| @Override |
| public void evaluate(IFrameTupleReference tuple) throws AlgebricksException { |
| |
| try { |
| outInput.reset(); |
| eval.evaluate(tuple); |
| byte[] serString = outInput.getByteArray(); |
| if (serString[0] == SER_STRING_TYPE_TAG) { |
| if (utf8BinaryComparator |
| .compare(serString, 1, outInput.getLength(), POSITIVE_INF, 0, 5) == 0) { |
| aFloat.setValue(Float.POSITIVE_INFINITY); |
| } else if (utf8BinaryComparator.compare(serString, 1, outInput.getLength(), |
| NEGATIVE_INF, 0, 6) == 0) { |
| aFloat.setValue(Float.NEGATIVE_INFINITY); |
| } else if (utf8BinaryComparator.compare(serString, 1, outInput.getLength(), NAN, 0, 5) == 0) { |
| aFloat.setValue(Float.NaN); |
| } else |
| aFloat.setValue(Float.parseFloat(new String(serString, 3, outInput.getLength() - 3, |
| "UTF-8"))); |
| floatSerde.serialize(aFloat, out); |
| |
| } else if (serString[0] == SER_NULL_TYPE_TAG) |
| nullSerde.serialize(ANull.NULL, out); |
| else |
| throw new AlgebricksException(errorMessage); |
| } catch (IOException e1) { |
| throw new AlgebricksException(errorMessage); |
| } |
| } |
| |
| // private float parseFloat(byte[] serString) throws |
| // AlgebricksException { |
| // |
| // if (serString[offset] == '+') |
| // offset++; |
| // else if (serString[offset] == '-') { |
| // offset++; |
| // positiveInteger = false; |
| // } |
| // |
| // if ((serString[offset] == '.') || (serString[offset] == |
| // 'e') || (serString[offset] == 'E') |
| // || (serString[outInput.getLength() - 1] == '.') |
| // || (serString[outInput.getLength() - 1] == 'E') |
| // || (serString[outInput.getLength() - 1] == 'e')) |
| // throw new AlgebricksException(errorMessage); |
| // |
| // for (; offset < outInput.getLength(); offset++) { |
| // if (serString[offset] >= '0' && serString[offset] <= '9') |
| // { |
| // value = value * 10 + serString[offset] - '0'; |
| // } else |
| // switch (serString[offset]) { |
| // case '.': |
| // if (expectingInteger) { |
| // if (serString[offset + 1] < '0' || serString[offset + 1] |
| // > '9') |
| // throw new AlgebricksException(errorMessage); |
| // expectingInteger = false; |
| // expectingFraction = true; |
| // integerPart = value; |
| // value = 0; |
| // pointIndex = offset; |
| // eIndex = outInput.getLength(); |
| // } else |
| // throw new AlgebricksException(errorMessage); |
| // break; |
| // case 'e': |
| // case 'E': |
| // if (expectingInteger) { |
| // expectingInteger = false; |
| // integerPart = value; |
| // pointIndex = offset - 1; |
| // eIndex = offset; |
| // value = 0; |
| // expectingExponent = true; |
| // } else if (expectingFraction) { |
| // |
| // expectingFraction = false; |
| // fractionPart = value; |
| // eIndex = offset; |
| // value = 0; |
| // expectingExponent = true; |
| // } else |
| // throw new AlgebricksException(); |
| // |
| // if (serString[offset + 1] == '+') |
| // offset++; |
| // else if (serString[offset + 1] == '-') { |
| // offset++; |
| // positiveExponent = false; |
| // } else if (serString[offset + 1] < '0' || |
| // serString[offset + 1] > '9') |
| // throw new AlgebricksException(errorMessage); |
| // break; |
| // default: |
| // throw new AlgebricksException(errorMessage); |
| // } |
| // } |
| // |
| // if (expectingInteger) |
| // integerPart = value; |
| // else if (expectingFraction) |
| // fractionPart = value; |
| // else if (expectingExponent) |
| // exponentPart = value * (positiveExponent ? 1 : -1); |
| // |
| // // floatValue = (float) ( integerPart + ( fractionPart * |
| // (1.0f / Math.pow(10.0f, eIndex - pointIndex - 1)))); |
| // // floatValue *= (float) Math.pow(10.0f, exponentPart); |
| // |
| // floatValue = Float.parseFloat(integerPart+"."+ |
| // fractionPart+"e"+ exponentPart); |
| // |
| // if (integerPart != 0 |
| // && (floatValue == Float.POSITIVE_INFINITY || floatValue |
| // == Float.NEGATIVE_INFINITY || floatValue == 0)) |
| // throw new AlgebricksException(errorMessage); |
| // |
| // if (floatValue > 0 && !positiveInteger) |
| // floatValue *= -1; |
| // |
| // return floatValue; |
| // } |
| }; |
| } |
| }; |
| } |
| |
| @Override |
| public FunctionIdentifier getIdentifier() { |
| return FID; |
| } |
| } |
