Class AbstractStringLayout

java.lang.Object

org.apache.logging.log4j.core.layout.AbstractLayout<String>

org.apache.logging.log4j.core.layout.AbstractStringLayout

All Implemented Interfaces:

LocationAware, Layout<String>, Encoder<LogEvent>, StringLayout

Direct Known Subclasses:

AbstractCsvLayout, AbstractJacksonLayout, GelfLayout, HtmlLayout, Log4j1SyslogLayout, Log4j1XmlLayout, PatternLayout, Rfc5424Layout, SyslogLayout

public abstract class AbstractStringLayout
extends AbstractLayout<String>
implements StringLayout, LocationAware

Abstract base class for Layouts that result in a String.

Since 2.4.1, this class has custom logic to convert ISO-8859-1 or US-ASCII Strings to byte[] arrays to improve performance: all characters are simply cast to bytes.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	AbstractStringLayout.Builder<B extends AbstractStringLayout.Builder<B>>
static interface	AbstractStringLayout.Serializer
static interface	AbstractStringLayout.Serializer2	Variation of AbstractStringLayout.Serializer that avoids allocating temporary objects.

Field Summary

Fields

Modifier and Type	Field	Description
private final Charset	charset	The charset for the formatted message.
protected static final int	DEFAULT_STRING_BUILDER_SIZE	Default length for new StringBuilder instances: 1024 .
private final AbstractStringLayout.Serializer	footerSerializer
private final AbstractStringLayout.Serializer	headerSerializer
protected static final int	MAX_STRING_BUILDER_SIZE
private Encoder<StringBuilder>	textEncoder
private static final ThreadLocal<StringBuilder>	threadLocal

Fields inherited from class AbstractLayout

configuration, eventCount, footer, header, LOGGER

Fields inherited from interface Layout

ELEMENT_TYPE

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractStringLayout(Charset charset)
protected	AbstractStringLayout(Charset aCharset, byte[] header, byte[] footer)	Builds a new layout.
protected	AbstractStringLayout(Configuration config, Charset aCharset, AbstractStringLayout.Serializer headerSerializer, AbstractStringLayout.Serializer footerSerializer)	Builds a new layout.

Method Summary

Modifier and Type	Method	Description
protected byte[]	getBytes(String s)
Charset	getCharset()	Gets the Charset this layout uses to encode Strings into bytes.
String	getContentType()	Returns the content type output by this layout.
byte[]	getFooter()	Returns the footer, if one is available.
AbstractStringLayout.Serializer	getFooterSerializer()
byte[]	getHeader()	Returns the header, if one is available.
AbstractStringLayout.Serializer	getHeaderSerializer()
private DefaultLogEventFactory	getLogEventFactory()
protected static StringBuilder	getStringBuilder()	Returns a StringBuilder that this Layout implementation can use to write the formatted log event to.
protected Encoder<StringBuilder>	getStringBuilderEncoder()	Returns a Encoder<StringBuilder> that this Layout implementation can use for encoding log events.
boolean	requiresLocation()
protected byte[]	serializeToBytes(AbstractStringLayout.Serializer serializer, byte[] defaultValue)
protected String	serializeToString(AbstractStringLayout.Serializer serializer)
private static int	size(String property, int defaultValue)
byte[]	toByteArray(LogEvent event)	Formats the Log Event as a byte array.
protected static void	trimToMaxSize(StringBuilder stringBuilder)

Methods inherited from class AbstractLayout

encode, getConfiguration, getContentFormat, markEvent

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface Encoder

encode

Methods inherited from interface Layout

getContentFormat, toSerializable

Field Details

DEFAULT_STRING_BUILDER_SIZE

protected static final int DEFAULT_STRING_BUILDER_SIZE

Default length for new StringBuilder instances: 1024 .

See Also:

• Constant Field Values

MAX_STRING_BUILDER_SIZE

protected static final int MAX_STRING_BUILDER_SIZE

threadLocal

private static final ThreadLocal<StringBuilder> threadLocal

textEncoder

private Encoder<StringBuilder> textEncoder

charset

private final Charset charset

The charset for the formatted message.

footerSerializer

private final AbstractStringLayout.Serializer footerSerializer

headerSerializer

private final AbstractStringLayout.Serializer headerSerializer

Constructor Details

AbstractStringLayout

protected AbstractStringLayout(Charset charset)

AbstractStringLayout

protected AbstractStringLayout(Charset aCharset,
 byte[] header,
 byte[] footer)

Builds a new layout.

Parameters:

aCharset - the charset used to encode the header bytes, footer bytes and anything else that needs to be converted from strings to bytes.

header - the header bytes

footer - the footer bytes

AbstractStringLayout

protected AbstractStringLayout(Configuration config,
 Charset aCharset,
 AbstractStringLayout.Serializer headerSerializer,
 AbstractStringLayout.Serializer footerSerializer)

Builds a new layout.

Parameters:

config - the configuration. May be null.

aCharset - the charset used to encode the header bytes, footer bytes and anything else that needs to be converted from strings to bytes.

headerSerializer - the header bytes serializer

footerSerializer - the footer bytes serializer

Method Details

requiresLocation

public boolean requiresLocation()

Specified by:

requiresLocation in interface LocationAware

getStringBuilder

protected static StringBuilder getStringBuilder()

Returns a StringBuilder that this Layout implementation can use to write the formatted log event to.

Returns:

a StringBuilder

size

private static int size(String property,
 int defaultValue)

trimToMaxSize

protected static void trimToMaxSize(StringBuilder stringBuilder)

getBytes

protected byte[] getBytes(String s)

getCharset

public Charset getCharset()

Description copied from interface: StringLayout

Gets the Charset this layout uses to encode Strings into bytes.

Specified by:

getCharset in interface StringLayout

Returns:

the Charset this layout uses to encode Strings into bytes.

getContentType

public String getContentType()

Description copied from interface: Layout

Returns the content type output by this layout. The base class returns "text/plain".

Specified by:

getContentType in interface Layout<String>

Returns:

The default content type for Strings.

getFooter

public byte[] getFooter()

Returns the footer, if one is available.

Specified by:

getFooter in interface Layout<String>

Overrides:

getFooter in class AbstractLayout<String>

Returns:

A byte array containing the footer.

getFooterSerializer

public AbstractStringLayout.Serializer getFooterSerializer()

getHeader

public byte[] getHeader()

Returns the header, if one is available.

Specified by:

getHeader in interface Layout<String>

Overrides:

getHeader in class AbstractLayout<String>

Returns:

A byte array containing the header.

getHeaderSerializer

public AbstractStringLayout.Serializer getHeaderSerializer()

getLogEventFactory

private DefaultLogEventFactory getLogEventFactory()

getStringBuilderEncoder

protected Encoder<StringBuilder> getStringBuilderEncoder()

Returns a Encoder<StringBuilder> that this Layout implementation can use for encoding log events.

Returns:

a Encoder<StringBuilder>

serializeToBytes

protected byte[] serializeToBytes(AbstractStringLayout.Serializer serializer,
 byte[] defaultValue)

serializeToString

protected String serializeToString(AbstractStringLayout.Serializer serializer)

toByteArray

public byte[] toByteArray(LogEvent event)

Formats the Log Event as a byte array.

Specified by:

toByteArray in interface Layout<String>

Parameters:

event - The Log Event.

Returns:

The formatted event as a byte array.