Package com.tangosol.config.expression

Class ValueMacroExpression.OffsetLengthSubstringExpansionProcessor

java.lang.Object

com.tangosol.config.expression.ValueMacroExpression.MacroExpansionProcessor

com.tangosol.config.expression.ValueMacroExpression.OffsetLengthSubstringExpansionProcessor

Enclosing class:

ValueMacroExpression

protected static class ValueMacroExpression.OffsetLengthSubstringExpansionProcessor
extends ValueMacroExpression.MacroExpansionProcessor

Process :offset and :length substring expansion.

See Also:

process(String, ParameterResolver, int)

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	OffsetLengthSubstringExpansionProcessor()

Method Summary

Modifier and Type	Method	Description
boolean	canProcess(String sMacro)	Return true iff sMacro contains the delimiter that this processor handles.
String	getDelimiter()	Return delimiter being used by the processor.
String	process(String sMacro, ParameterResolver resolver, int cDepth)	Perform substring expansion on sMacro.

Methods inherited from class com.tangosol.config.expression.ValueMacroExpression.MacroExpansionProcessor

validateMacroExpansion

Methods inherited from class java.lang.Object

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

Constructor Detail

OffsetLengthSubstringExpansionProcessor

protected OffsetLengthSubstringExpansionProcessor()

Method Detail

getDelimiter

public String getDelimiter()

Description copied from class: ValueMacroExpression.MacroExpansionProcessor

Return delimiter being used by the processor.

Overrides:

getDelimiter in class ValueMacroExpression.MacroExpansionProcessor

Returns:

delimiter used by the processor or empty string if processor does not have a delimiter

canProcess

public boolean canProcess(String sMacro)

Description copied from class: ValueMacroExpression.MacroExpansionProcessor

Return true iff sMacro contains the delimiter that this processor handles.

Overrides:

canProcess in class ValueMacroExpression.MacroExpansionProcessor

Parameters:

sMacro - the macro parameter

Returns:

true iff this processor can process sMacro

process

public String process(String sMacro,
                      ParameterResolver resolver,
                      int cDepth)

Perform substring expansion on sMacro.

 ${macro-parameter:offset}
 ${macro-parameter:offset:length}
 Note that length and offset are integer values.
 

Substring expansion expands to up to length characters of the value of macro-parameter starting at the character specified by offset.
If length is omitted, it expands to the substring of the value of macro-parameter starting at the character specified by offset and extending to the end of the value.
If offset evaluates to a number less than zero, the value is used as an offset in characters from the end of the value of macro-parameter.
If length evaluates to a number less than zero, it is interpreted as an offset in characters from the end of the value of macro-parameter. rather than a number of characters, and the expansion is the characters between offset and that result.

Note that a negative offset or length must be separated from the colon by at least one space to avoid being confused with the macro parameter default delimiter :-.

Examples illustrating substring expansion of a parameter:

 Given property parameter of string value 01234567890abcdefgh.

 ${parameter:7} evaluates to 7890abcdefgh
 ${parameter:7:0} evaluates to empty string
 ${parameter:7:2} evaluates to 78
 ${parameter:7: -2} evaluates to 7890abcdef
 ${parameter: -7} evaluates to bcdefgh
 ${parameter: -7:0} evaluates to empty string
 ${parameter: -7:2} evaluates to bc
 ${parameter: -7: -2} evaluates to bcdef
 

Overrides:

process in class ValueMacroExpression.MacroExpansionProcessor

Parameters:

sMacro - a string starting with prefix and ending with suffix

resolver - macro parameter resolver

cDepth - count of current macro parameter expansions

Returns:

the substring expanded value or the original parameter macro if it does not contain substring expansion