/*
 * 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.numeric;

import java.io.DataOutput;
import java.io.IOException;

import org.apache.vxquery.datamodel.accessors.atomic.XSDecimalPointable;
import org.apache.vxquery.datamodel.values.ValueTag;
import org.apache.vxquery.exceptions.SystemException;

import org.apache.hyracks.data.std.primitive.DoublePointable;
import org.apache.hyracks.data.std.primitive.FloatPointable;
import org.apache.hyracks.data.std.primitive.LongPointable;

public class FnRoundOperation extends AbstractNumericOperation {

    @Override
    public void operateDecimal(XSDecimalPointable decp, DataOutput dOut) throws SystemException, IOException {
        dOut.write(ValueTag.XS_DECIMAL_TAG);
        dOut.write(0);
        dOut.writeLong((long) (decp.getBeforeDecimalPlaceRounded()));
    }

    @Override
    public void operateDouble(DoublePointable doublep, DataOutput dOut) throws SystemException, IOException {
        double value = doublep.getDouble();
        if (value < 0 && value >= -0.5) {
            value = -0.0;
        } else if (!Double.isNaN(value) && !Double.isInfinite(value) && value != 0.0) {
            value = Math.round(value);
        }
        dOut.write(ValueTag.XS_DOUBLE_TAG);
        dOut.writeDouble(value);
    }

    @Override
    public void operateFloat(FloatPointable floatp, DataOutput dOut) throws SystemException, IOException {
        float value = floatp.getFloat();
        if (value < 0 && value >= -0.5f) {
            value = -0.0f;
        } else if (!Float.isNaN(value) && !Float.isInfinite(value) && value != 0.0f) {
            value = Math.round(value);
        }
        dOut.write(ValueTag.XS_FLOAT_TAG);
        dOut.writeFloat(value);
    }

    @Override
    public void operateInteger(LongPointable longp, DataOutput dOut) throws SystemException, IOException {
        dOut.write(ValueTag.XS_INTEGER_TAG);
        dOut.writeLong(longp.getLong());
    }
}