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/*
* 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.qpid.amqp_1_0.codec;
import org.apache.qpid.amqp_1_0.type.AmqpErrorException;
import org.apache.qpid.amqp_1_0.type.transport.ConnectionError;
import java.math.BigDecimal;
import java.nio.ByteBuffer;
public abstract class DecimalConstructor implements TypeConstructor<BigDecimal>
{
private static final DecimalConstructor DECIMAL_32 = new DecimalConstructor()
{
public BigDecimal construct(final ByteBuffer in, final ValueHandler handler) throws AmqpErrorException
{
int val;
if(in.remaining()>=4)
{
val = in.getInt();
}
else
{
throw new AmqpErrorException(ConnectionError.FRAMING_ERROR, "Cannot construct decimal32: insufficient input data");
}
return constructFrom32(val);}
};
private static final DecimalConstructor DECIMAL_64 = new DecimalConstructor()
{
public BigDecimal construct(final ByteBuffer in, final ValueHandler handler) throws AmqpErrorException
{
long val;
if(in.remaining()>=8)
{
val = in.getLong();
}
else
{
throw new AmqpErrorException(ConnectionError.FRAMING_ERROR, "Cannot construct decimal64: insufficient input data");
}
return constructFrom64(val);
}
};
private static final DecimalConstructor DECIMAL_128 = new DecimalConstructor()
{
public BigDecimal construct(final ByteBuffer in, final ValueHandler handler) throws AmqpErrorException
{
long high;
long low;
if(in.remaining()>=16)
{
high = in.getLong();
low = in.getLong();
}
else
{
throw new AmqpErrorException(ConnectionError.FRAMING_ERROR, "Cannot construct decimal128: insufficient input data");
}
return constructFrom128(high, low);
}
};
private static final BigDecimal TWO_TO_THE_SIXTY_FOUR = new BigDecimal(2).pow(64);
private static BigDecimal constructFrom128(long high, long low)
{
int sign = ((high & 0x8000000000000000l) == 0) ? 1 : -1;
int exponent = 0;
long significand = high;
if((high & 0x6000000000000000l) != 0x6000000000000000l)
{
exponent = ((int) ((high & 0x7FFE000000000000l) >> 49)) - 6176;
significand = high & 0x0001ffffffffffffl;
}
else if((high & 0x7800000000000000l) != 0x7800000000000000l)
{
exponent = ((int)((high & 0x1fff800000000000l)>>47)) - 6176;
significand = (0x00007fffffffffffl & high) | 0x0004000000000000l;
}
else
{
// NaN or infinite
return null;
}
BigDecimal bigDecimal = new BigDecimal(significand).multiply(TWO_TO_THE_SIXTY_FOUR);
if(low >=0)
{
bigDecimal = bigDecimal.add(new BigDecimal(low));
}
else
{
bigDecimal = bigDecimal.add(TWO_TO_THE_SIXTY_FOUR.add(new BigDecimal(low)));
}
if(((high & 0x8000000000000000l) != 0))
{
bigDecimal = bigDecimal.negate();
}
bigDecimal = bigDecimal.scaleByPowerOfTen(exponent);
return bigDecimal;
}
private static BigDecimal constructFrom64(final long val)
{
int sign = ((val & 0x8000000000000000l) == 0) ? 1 : -1;
int exponent = 0;
long significand = val;
if((val & 0x6000000000000000l) != 0x6000000000000000l)
{
exponent = ((int) ((val & 0x7FE0000000000000l) >> 53)) - 398;
significand = val & 0x001fffffffffffffl;
}
else if((val & 0x7800000000000000l) != 0x7800000000000000l)
{
exponent = ((int)((val & 0x1ff8000000000000l)>>51)) - 398;
significand = (0x0007ffffffffffffl & val) | 0x0020000000000000l;
}
else
{
// NaN or infinite
return null;
}
BigDecimal bigDecimal = new BigDecimal(sign * significand);
bigDecimal = bigDecimal.scaleByPowerOfTen(exponent);
return bigDecimal;
}
private static BigDecimal constructFrom32(final int val)
{
int sign = ((val & 0x80000000) == 0) ? 1 : -1;
int exponent = 0;
int significand = val;
if((val & 0x60000000) != 0x60000000)
{
exponent = ((int) ((val & 0x7F800000) >> 23)) - 101;
significand = val & 0x007fffffff;
}
else if((val & 0x78000000) != 0x78000000)
{
exponent = ((int)((val & 0x1fe00000)>>21)) - 101;
significand = (0x001fffff & val) | 0x00800000;
}
else
{
// NaN or infinite
return null;
}
BigDecimal bigDecimal = new BigDecimal(sign * significand);
bigDecimal = bigDecimal.scaleByPowerOfTen(exponent);
return bigDecimal;
}
/*
public static void main(String[] args)
{
System.out.println(constructFrom128(0l,0l));
System.out.println(constructFrom128(0x3041ED09BEAD87C0l,0x378D8E63FFFFFFFFl));
System.out.println(constructFrom64(0l));
System.out.println(constructFrom64(0x5fe0000000000001l));
System.out.println(constructFrom64(0xec7386F26FC0FFFFl));
System.out.println(constructFrom32(0));
System.out.println(constructFrom32(0x6cb8967f));
}
*/
public static TypeConstructor getDecimal32Instance()
{
return DECIMAL_32;
}
public static TypeConstructor getDecimal64Instance()
{
return DECIMAL_64;
}
public static TypeConstructor getDecimal128Instance()
{
return DECIMAL_128;
}
}
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