public class KeyExtractor<T,E> extends AbstractExtractor<T,E> implements ExternalizableLite, PortableObject
ReflectionExtractor is that when used in various
EntryFilter implementations it forces
the evaluation of entry keys rather than entry values.
For example, consider a key object that consists of two properties: "FirstName" and "LastName". To retrieve all keys that have a value of the "LastName" property equal to "Smith", the following query could be used:
ValueExtractor extractor = new KeyExtractor("getLastName");
Set setKeys = cache.keySet(new EqualsFilter(extractor, "Smith"));
As of Coherence 3.5, the same effect can be achieved for subclasses of the
AbstractExtractor, for example:
ValueExtractor extractor = new ReflectionExtractor("getLastName", null,
AbstractExtractor.KEY);
Set setKeys = cache.keySet(new EqualsFilter(extractor, "Smith"));
Note: This class does not function with
PofExtractor and the mechanism
described above is recommended.ExternalizableHelper.DecoratedMultiBufferReadBuffer, ExternalizableHelper.DefaultObjectStreamFactory, ExternalizableHelper.FormatAwareCompressor, ExternalizableHelper.IntDecoratedObject, ExternalizableHelper.Shielded, ExternalizableHelper.ShieldedDataOutputStream, ExternalizableHelper.ShieldedInputStream, ExternalizableHelper.ShieldedObjectOutputStream, ExternalizableHelper.ShieldedOutputStream, ExternalizableHelper.SimpleXmlBeanClassCache, ExternalizableHelper.Stats, ExternalizableHelper.XmlBeanClassCacheBase.LoggingWriter, Base.StackFrame| Modifier and Type | Field and Description |
|---|---|
protected ValueExtractor<? super T,? extends E> |
m_extractor
The underlying ValueExtractor.
|
KEY, m_nTarget, m_sNameCanon, VALUECONVERTER_FROM_BINARY, CONVERTER_STRIP_INTDECO, CONVERTER_TO_BINARY, DECO_APP_1, DECO_APP_2, DECO_APP_3, DECO_CUSTOM, DECO_EXPIRY, DECO_ID_MAX, DECO_ID_MIN, DECO_JCACHE, DECO_JCACHE_SYNTHETIC, DECO_MEMCACHED, DECO_PUSHREP, DECO_QUEUE_METADATA, DECO_RSVD_1, DECO_RSVD_2, DECO_STORE, DECO_TX, DECO_VALUE, DECO_WLS, EMPTY_BINARY_ARRAY, FMT_B_ARRAY, FMT_BIN_DECO, FMT_BIN_EXT_DECO, FMT_BINARY, FMT_BOOLEAN, FMT_BYTE, FMT_DECIMAL, FMT_DOUBLE, FMT_EXT, FMT_FLOAT, FMT_IDO, FMT_INT, FMT_INTEGER, FMT_LONG, FMT_NONE, FMT_NULL, FMT_OBJ_EXT, FMT_OBJ_SER, FMT_OPT, FMT_OPT_DOUBLE, FMT_OPT_INT, FMT_OPT_LONG, FMT_SHORT, FMT_STRING, FMT_UNKNOWN, FMT_XML_BEAN, FMT_XML_SER, FORCE_RESOLVING_STREAMS, MAX_DECO_HEADER_BYTES, PROPERTY_CONFIG, s_streamfactory, TRINT_DOMAIN_SPAN, TRINT_MAX_VALUE, TRINT_MAX_VARIANCE, USE_POF_STREAMS, USE_XMLBEAN_CLASS_CACHE, XMLBEAN_CLASS_CACHE| Constructor and Description |
|---|
KeyExtractor()
Default constructor (necessary for the ExternalizableLite
and PortableObject interfaces).
|
KeyExtractor(String sMethod)
Construct a KeyExtractor for a specified method name.
|
KeyExtractor(ValueExtractor<? super T,? extends E> extractor)
Construct a KeyExtractor based on a specified ValueExtractor.
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
equals(Object o)
Equivalence by canonical name and target.
|
E |
extract(T oTarget)
Extract the value from the passed object.
|
String |
getCanonicalName()
Return the canonical name for this extractor.
|
ValueExtractor<? super T,? extends E> |
getExtractor()
Obtain the underlying ValueExtractor.
|
int |
hashCode()
Compute hashCode from underlying
ValueExtractor. |
static <T,E> ValueExtractor<T,E> |
of(ValueExtractor<T,E> extractor)
Factory method for key extractor.
|
void |
readExternal(DataInput in)
Restore the contents of this object by loading the object's state from
the passed DataInput object.
|
void |
readExternal(PofReader in)
Restore the contents of a user type instance by reading its state using
the specified PofReader object.
|
String |
toString()
Return a human-readable description for this KeyExtractor.
|
void |
writeExternal(DataOutput out)
Save the contents of this object by storing the object's state into
the passed DataOutput object.
|
void |
writeExternal(PofWriter out)
Save the contents of a POF user type instance by writing its state using
the specified PofWriter object.
|
compare, compareEntries, extractFromEntry, extractOriginalFromEntry, getTarget, isCanonicallyEquatableasBinary, calculatePackedLength, calculatePackedLength, checkObjectInputFilter, convertUTF, decodeExpiry, decorate, decorate, decorate, decorate, decorate, decorateBinary, encodeExpiry, ensureSerializer, extractIntDecoration, fromBinary, fromBinary, fromBinary, fromBinary, fromBinary, fromBinary, fromByteArray, fromByteArray, getClass, getDecoration, getDecoration, getDecorations, getDeltaCompressor, getInputStream, getNewObjectInput, getObjectInput, getObjectOutput, getObjectStreamFactory, getOutputStream, getShieldedOutputStream, getStreamFormat, getUndecorated, getUndecorated, isDecorated, isDecorated, isIntDecorated, isIntDecorated, isResolving, isSerializable, isSerializerCompatible, isVersionCompatible, isVersionCompatible, loadClass, loadResource, main, makeTrint, readBigDecimal, readBigInteger, readBooleanArray, readByteArray, readCollection, readDate, readDoubleArray, readExternalizableLite, readExternalizableLite, readFloatArray, readInt, readInt, readIntArray2d, readLong, readLong, readMap, readMap, readObject, readObject, readSafeUTF, readSafeUTF, readSerializable, readSerializable, readStringArray, readTime, readTimestamp, readTrint, readUnsignedTrint, readUTF, readXmlBean, readXmlSerializable, readXmlSerializable, realize, removeIntDecoration, removeIntDecoration, replace, reportIncompatibleSerializers, setObjectStreamFactory, toBinary, toBinary, toByteArray, toByteArray, toByteArray, toLiteBinary, toLong, undecorate, undecorate, validateBufferSize, writeBigDecimal, writeBigInteger, writeBooleanArray, writeByteArray, writeCollection, writeDate, writeDoubleArray, writeExternalizableLite, writeFloatArray, writeInt, writeInt, writeIntArray2d, writeLong, writeLong, writeMap, writeObject, writeSafeUTF, writeSafeUTF, writeSerializable, writeStringArray, writeTime, writeTimestamp, writeTrint, writeTrint, writeUTF, writeXmlBean, writeXmlSerializablecountBits, countBits, countBits, indexOfLSB, indexOfLSB, indexOfLSB, indexOfMSB, indexOfMSB, indexOfMSB, rotateLeft, rotateLeft, rotateLeft, rotateRight, rotateRight, rotateRight, toBitString, toBitString, toBitString, toBytes, toBytes, toBytes, toBytes, toInt, toInt, toLongazzert, azzert, azzert, azzertFailed, breakLines, breakLines, capitalize, checkNotEmpty, checkNotNull, checkRange, computeSafeWaitTime, decimalValue, dup, dup, ensureBigDecimal, ensureClassLoader, ensureRuntimeException, ensureRuntimeException, equals, equalsDeep, err, err, err, err, err, escape, formatDateTime, getCallerStackFrame, getCommonMonitor, getCommonMonitor, getCommonMonitor, getContextClassLoader, getContextClassLoader, getDeepMessage, getErr, getLastSafeTimeMillis, getLog, getMaxDecDigits, getMaxHexDigits, getOriginalException, getOut, getProcessRandom, getRandom, getRandomBinary, getRandomBinary, getRandomString, getSafeTimeMillis, getStackFrame, getStackFrames, getStackTrace, getStackTrace, getThreadFactory, getTimeZone, getUpTimeMillis, hashCode, hexValue, indentString, indentString, isDecimal, isHex, isLogEcho, isOctal, log, log, log, log, log, makeInteger, makeLong, makeThread, mod, mod, octalValue, out, out, out, out, out, pad, parseBandwidth, parseBandwidth, parseDelimitedString, parseHex, parseHex, parseMemorySize, parseMemorySize, parsePercentage, parseTime, parseTime, parseTimeNanos, parseTimeNanos, printStackTrace, randomize, randomize, randomize, randomize, read, read, read, read, read, read, read, replace, setErr, setLog, setLogEcho, setOut, sleep, toBandwidthString, toBandwidthString, toCharEscape, toCrc, toCrc, toCrc, toCrc, toCrc, toDecString, toDelimitedString, toDelimitedString, toDelimitedString, toDelimitedString, toHex, toHex, toHexDump, toHexEscape, toHexEscape, toHexEscape, toHexEscape, toHexString, toMemorySizeString, toMemorySizeString, toQuotedCharEscape, toQuotedStringEscape, toSqlString, toString, toString, toStringEscape, toUnicodeEscape, trace, trace, trace, trace, trace, trace, trace, trace, trace, truncateString, truncateString, waitclone, finalize, getClass, notify, notifyAll, wait, wait, waitandThen, apply, applyAsDouble, applyAsInt, applyAsLong, compose, fromKey, identity, identityCastandThen, composecomparing, comparing, comparingDouble, comparingInt, comparingLong, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLongprotected ValueExtractor<? super T,? extends E> m_extractor
public KeyExtractor()
public KeyExtractor(ValueExtractor<? super T,? extends E> extractor)
extractor - the underlying ValueExtractorpublic KeyExtractor(String sMethod)
sMethod - a method name to construct an underlying
ReflectionExtractor for;
this parameter can also be a dot-delimited sequence
of method names which would result in a KeyExtractor
based on the ChainedExtractor that is based on
an array of corresponding ReflectionExtractor objectspublic E extract(T oTarget)
extract in interface ValueExtractor<T,E>extract in class AbstractExtractor<T,E>oTarget - the object to extract the value frompublic String getCanonicalName()
ValueExtractorA canonical name uniquely identifies what is to be extracted, but not how it is to be extracted. Thus two different extractor implementations with the same non-null canonical name are considered to be equal, and should reflect this in their implementations of hashCode and equals.
Canonical names for properties are designated by their property name in camel case,
for instance a Java Bean with method getFooBar would have a property named fooBar,
and would have fooBar as its canonical name.
Canonical names for zero-arg method invocations are the method name followed by ().
Dots in a canonical name delimit one or more property/method accesses represented by a chaining
ValueExtractor such as ChainedExtractor or
PofExtractor(Class, PofNavigator, String).
There is currently no canonical name format for methods which take parameters and
as such they must return a canonical name of null.
getCanonicalName in interface com.oracle.coherence.common.base.CanonicallyNamedgetCanonicalName in interface ValueExtractor<T,E>getCanonicalName in class AbstractExtractor<T,E>nullpublic ValueExtractor<? super T,? extends E> getExtractor()
public static <T,E> ValueExtractor<T,E> of(ValueExtractor<T,E> extractor)
of in interface ValueExtractor<T,E>T - the type of the value to extract fromE - the type of value that will be extractedextractor - an extractor to convert to key extractorpublic boolean equals(Object o)
AbstractExtractor
When precondition AbstractExtractor.isCanonicallyEquatable(Object) is false,
fall back to implementation specific equals implementation.
equals in interface ValueExtractor<T,E>equals in interface Comparatorequals in class AbstractExtractor<T,E>o - the reference object with which to comparetrue if canonical name match and no target mismatchpublic int hashCode()
ValueExtractor.hashCode in interface ValueExtractor<T,E>hashCode in class AbstractExtractor<T,E>public String toString()
public void readExternal(DataInput in) throws IOException
readExternal in interface ExternalizableLitein - the DataInput stream to read data from in order to restore
the state of this objectIOException - if an I/O exception occursNotActiveException - if the object is not in its initial
state, and therefore cannot be deserialized intopublic void writeExternal(DataOutput out) throws IOException
writeExternal in interface ExternalizableLiteout - the DataOutput stream to write the state of this object toIOException - if an I/O exception occurspublic void readExternal(PofReader in) throws IOException
readExternal in interface PortableObjectin - the PofReader from which to read the object's stateIOException - if an I/O error occurspublic void writeExternal(PofWriter out) throws IOException
writeExternal in interface PortableObjectout - the PofWriter to which to write the object's stateIOException - if an I/O error occurs