/// <summary>
/// Incorporate one aggregatable value into the result.
/// </summary>
/// <remarks>
/// If the <paramref name="isFinal"/> parameter is <b>true</b>, the
/// given object is a partial result (returned by an individual
/// parallel aggregator) that should be incorporated into the final
/// result; otherwise, the object is a value extracted from an
/// <see cref="IInvocableCacheEntry"/>.
/// </remarks>
/// <param name="o">
/// The value to incorporate into the aggregated result.
/// </param>
/// <param name="isFinal">
/// <b>true</b> to indicate that the given object is a partial
/// result returned by a parallel aggregator.
/// </param>
protected override void Process(object o, bool isFinal)
{
if (o != null)
{
Object result = m_result;
if (result == null ||
SafeComparer.CompareSafe(m_comparer, result, o) < 0)
{
m_result = o;
}
m_count++;
}
}
public void TestUnitComparisonValueExtractor()
{
IValueExtractor exByte = new ReflectionExtractor("ByteValue");
IValueExtractor exShort = new ReflectionExtractor("ShortValue");
IValueExtractor exInt = new ReflectionExtractor("IntValue");
IValueExtractor exLong = new ReflectionExtractor("LongValue");
IValueExtractor exFloat = new ReflectionExtractor("FloatValue");
IValueExtractor exDouble = new ReflectionExtractor("DoubleValue");
IValueExtractor exDecimal = new ReflectionExtractor("DecimalValue");
IValueExtractor exInt128 = new ReflectionExtractor("RawInt128Value");
IValueExtractor[] extractors = new IValueExtractor[] { exDouble, exInt };
//different ways to instantiate same extractor
ComparisonValueExtractor cve1 = new ComparisonValueExtractor(extractors);
ComparisonValueExtractor cve2 = new ComparisonValueExtractor(exDouble, exInt);
ComparisonValueExtractor cve3 = new ComparisonValueExtractor(exDouble, exInt, null);
ComparisonValueExtractor cve4 = new ComparisonValueExtractor("DoubleValue", "IntValue");
ComparisonValueExtractor cve5 = new ComparisonValueExtractor("DoubleValue", "IntValue", null);
Assert.IsNotNull(cve1);
Assert.IsNotNull(cve2);
Assert.IsNotNull(cve3);
Assert.IsNotNull(cve4);
Assert.IsNotNull(cve5);
Assert.IsTrue(cve1.Equals(cve2));
Assert.IsTrue(cve1.Equals(cve3));
Assert.IsTrue(cve1.Equals(cve4));
Assert.IsTrue(cve1.Equals(cve5));
Assert.IsNull(cve1.Comparer);
Assert.AreEqual(cve1.Extractors.Length, 2);
Score score = new Score(1, 1, 126, 10000L, 1.24f, 1432.55, new decimal(11223344), new RawInt128(new byte[] { 1 }), 1);
Assert.AreEqual(cve1.Extract(score), score.DoubleValue - Convert.ToDouble(score.IntValue));
cve1 = new ComparisonValueExtractor(exByte, exShort);
Assert.AreEqual(cve1.Extract(score), Convert.ToInt32(score.ByteValue) - Convert.ToInt32(score.ShortValue));
cve1 = new ComparisonValueExtractor(exLong, exInt);
Assert.AreEqual(cve1.Extract(score), score.LongValue - Convert.ToInt64(score.IntValue));
cve1 = new ComparisonValueExtractor(exLong, exFloat);
Assert.AreEqual(cve1.Extract(score), Convert.ToDouble(score.LongValue) - Convert.ToDouble(score.FloatValue));
cve1 = new ComparisonValueExtractor(exDecimal, exDouble);
Assert.AreEqual(cve1.Extract(score), Decimal.Subtract(score.DecimalValue, Convert.ToDecimal(score.DoubleValue)));
ComparisonValueExtractor cve6 = new ComparisonValueExtractor("ShortValue", "ShortValue", Comparer.Default);
Assert.AreEqual(cve6.Extract(score),
SafeComparer.CompareSafe(Comparer.Default, score.ShortValue, score.ShortValue));
}
/// <summary>
/// Compare two entries based on the rules specified by
/// <b>IComparer</b>.
/// </summary>
/// <remarks>
/// <p>
/// If possible, use the <see cref="IQueryCacheEntry.Extract"/>
/// method to optimize the value extraction process.</p>
/// <p>
/// This method is expected to be implemented by <b>IComparer</b>
/// wrappers, which simply pass on this invocation to the wrapped
/// <b>IComparer</b> objects if they too implement this interface, or
/// to invoke their default compare method passing the actual objects
/// (not the extracted values) obtained from the extractor using the
/// passed entries.</p>
/// <p>
/// This interface is also expected to be implemented by
/// <see cref="IValueExtractor"/> implementations that implement the
/// <b>IComparer</b> interface. It is expected that in most cases,
/// the <b>IComparer</b> wrappers will eventually terminate at (i.e.
/// delegate to) <b>IValueExtractors</b> that also implement this
/// interface.</p>
/// </remarks>
/// <param name="entry1">
/// The first entry to compare values from; read-only.
/// </param>
/// <param name="entry2">
/// The second entry to compare values from; read-only.
/// </param>
/// <returns>
/// A negative integer, zero, or a positive integer as the first
/// entry denotes a value that is is less than, equal to, or greater
/// than the value denoted by the second entry.
/// </returns>
/// <exception cref="InvalidCastException">
/// If the arguments' types prevent them from being compared by this
/// <b>IComparer</b>.
/// </exception>
/// <exception cref="ArgumentException">
/// If the extractor cannot handle the passed objects for any other
/// reason; an implementor should include a descriptive message.
/// </exception>
/// <since>Coherence 3.2</since>
public override int CompareEntries(IQueryCacheEntry entry1, IQueryCacheEntry entry2)
{
IValueExtractor[] extractors = Extractors;
for (int i = 0, c = extractors.Length; i < c; i++)
{
IValueExtractor extractor = extractors[i];
int result = SafeComparer.CompareSafe(null, entry1.Extract(extractor), entry2.Extract(extractor));
if (result != 0)
{
return(result);
}
}
return(0);
}
/// <summary>
/// Extract the value from the passed object.
/// </summary>
/// <remarks>
/// The returned value may be <c>null</c>.
/// </remarks>
/// <param name="obj">
/// An object to retrieve the value from.
/// </param>
/// <returns>
/// The extracted value as an object; <c>null</c> is an acceptable
/// value.
/// </returns>
/// <exception cref="InvalidCastException">
/// If this IValueExtractor is incompatible with the passed object to
/// extract a value from and the implementation <b>requires</b> the
/// passed object to be of a certain type.
/// </exception>
/// <exception cref="ArgumentException">
/// If this AbstractExtractor cannot handle the passed object for any
/// other reason; an implementor should include a descriptive
/// message.
/// </exception>
public override object Extract(object obj)
{
IValueExtractor[] extractors = Extractors;
IComparer comparer = Comparer;
object o1 = extractors[0].Extract(obj);
object o2 = extractors[1].Extract(obj);
if (NumberUtils.IsNumber(o1) && NumberUtils.IsNumber(o2) && comparer == null)
{
StreamFormat type;
if (o1.GetType() == o2.GetType())
{
// most common case; same types
type = GetStreamFormat(o1);
}
else
{
StreamFormat[] types = new StreamFormat[] {
StreamFormat.Byte, // 0
StreamFormat.Short, // 1
StreamFormat.Int, // 2
StreamFormat.Long, // 3
StreamFormat.Float, // 4
StreamFormat.Double, // 5
StreamFormat.RawInt128, // 6
StreamFormat.Decimal // 7
};
StreamFormat type1 = GetStreamFormat(o1);
StreamFormat type2 = GetStreamFormat(o2);
int typesCount, ix1, ix2;
ix1 = ix2 = typesCount = types.Length;
for (int i = 0; i < typesCount; i++)
{
StreamFormat t = types[i];
if (t == type1)
{
ix1 = i;
}
if (t == type2)
{
ix2 = i;
}
}
switch (Math.Max(ix1, ix2))
{
case 0:
case 1:
case 2:
type = StreamFormat.Int;
break;
case 3:
type = StreamFormat.Long;
break;
case 4:
case 5:
type = StreamFormat.Double;
break;
case 6:
case 7:
type = StreamFormat.Decimal;
o1 = EnsureDecimal(o1);
o2 = EnsureDecimal(o2);
break;
default:
type = StreamFormat.None;
break;
}
}
switch (type)
{
case StreamFormat.Byte:
case StreamFormat.Short:
case StreamFormat.Int:
return(Convert.ToInt32(o1) - Convert.ToInt32(o2));
case StreamFormat.Long:
return(Convert.ToInt64(o1) - Convert.ToInt64(o2));
case StreamFormat.Float:
return(Convert.ToSingle(o1) - Convert.ToSingle(o2));
case StreamFormat.Double:
return(Convert.ToDouble(o1) - Convert.ToDouble(o2));
case StreamFormat.RawInt128:
return(NumberUtils.DecimalToRawInt128(Decimal.Subtract(((RawInt128)o1).ToDecimal(), ((RawInt128)o2).ToDecimal())));
case StreamFormat.Decimal:
return(Decimal.Subtract(Convert.ToDecimal(o1), Convert.ToDecimal(o2)));
}
}
return(SafeComparer.CompareSafe(comparer, o1, o2));
}
/// <summary>
/// Compare two entries.
/// </summary>
/// <param name="entry1">
/// The first entry to compare values from; read-only.
/// </param>
/// <param name="entry2">
/// The second entry to compare values from; read-only.
/// </param>
/// <returns>
/// A negative integer, zero, or a positive integer as the first
/// entry denotes a value that is is less than, equal to, or greater
/// than the value denoted by the second entry
/// </returns>
/// <exception cref="InvalidCastException">
/// If the arguments' types prevent them from being compared by this
/// <b>IComparer</b>.
/// </exception>
/// <exception cref="ArgumentException">
/// If the extractor cannot handle the passed objects for any other
/// reason; an implementor should include a descriptive message.
/// </exception>
public virtual int CompareEntries(IQueryCacheEntry entry1, IQueryCacheEntry entry2)
{
return(SafeComparer.CompareSafe(null, entry1.Extract(this), entry2.Extract(this)));
}
/// <summary>
/// Compares its two arguments for order.
/// </summary>
/// <remarks>
/// Returns a negative integer, zero, or a positive integer as the
/// first argument is less than, equal to, or greater than the
/// second. <c>null</c> values are evaluated as "less then" any
/// non-null value.
/// </remarks>
/// <param name="o1">
/// The first object to be compared.
/// </param>
/// <param name="o2">
/// The second object to be compared.
/// </param>
/// <returns>
/// A negative integer, zero, or a positive integer as the first
/// argument is less than, equal to, or greater than the second.
/// </returns>
public virtual int Compare(object o1, object o2)
{
return(SafeComparer.CompareSafe(null, Extract(o1), Extract(o2)));
}