dk.dma.ais.packet

Class AisPacketFiltersBase

java.lang.Object

dk.dma.ais.packet.AisPacketFiltersBase

All Implemented Interfaces:

FilterPredicateFactory

Direct Known Subclasses:

AisPacketFilters, AisPacketFiltersStateful

public abstract class AisPacketFiltersBase
extends Object
implements FilterPredicateFactory

This class provides shared behaviour for different types of AisPacketFilters.

Constructor Summary

Constructors

Constructor and Description
AisPacketFiltersBase()

Method Summary

Modifier and Type	Method and Description
protected static boolean	compare(float lhs, float rhs, CompareToOperator operator) Compare the left-hand side value to the right-hand side value using the specified operator.
protected static boolean	compare(int lhs, int rhs, CompareToOperator operator) Compare the left-hand side value to the right-hand side value using the specified operator.
protected static boolean	compare(String lhs, String rhs, CompareToOperator operator) Lexically compare the left-hand side value to the right-hand side value using the specified operator.
protected static boolean	inRange(float min, float max, float value) Test if the floating point value is in the closed range between min and max.
protected static boolean	inRange(int min, int max, int value) Test if the integer value is in the closed range between min and max.
protected static <T> boolean	matchesGlob(T value, String glob) Test of the string representation of the supplied value matches the given glob expression.
protected static String	preprocessAisString(String aisString) Convert an AIS string to a Java string.
protected static String	preprocessExpressionString(String string) Remove an optional pair of apostrophes around the string.
protected static String[]	preprocessExpressionStrings(String[] strings) Remove an optional pair of apostrophes around each string in an array of strings.

Methods inherited from class java.lang.Object

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

Constructor Detail

AisPacketFiltersBase

public AisPacketFiltersBase()

Method Detail

preprocessAisString

protected static final String preprocessAisString(String aisString)

Convert an AIS string to a Java string. I.e. convert '@' to space and remove leading and trailing spaces.

Parameters:

aisString - the AIS string

Returns:

the Java string

preprocessExpressionString

protected static final String preprocessExpressionString(String string)

Remove an optional pair of apostrophes around the string.

Parameters:

string - the string

Returns:

string string

preprocessExpressionStrings

protected static final String[] preprocessExpressionStrings(String[] strings)

Remove an optional pair of apostrophes around each string in an array of strings.

Parameters:

strings - the strings

Returns:

string [ ]

compare

protected static final boolean compare(String lhs,
                                       String rhs,
                                       CompareToOperator operator)

Lexically compare the left-hand side value to the right-hand side value using the specified operator.

Parameters:

lhs - the value of the left-hand side.

rhs - the value of the right-hand side.

operator - the binary operator to apply for the comparison.

Returns:

true if the left-hand side compares true to the right-hand side. False otherwise.

compare

protected static final boolean compare(int lhs,
                                       int rhs,
                                       CompareToOperator operator)

Compare the left-hand side value to the right-hand side value using the specified operator.

Parameters:

lhs - the value of the left-hand side.

rhs - the value of the right-hand side.

operator - the binary operator to apply for the comparison.

Returns:

true if the left-hand side compares true to the right-hand side. False otherwise.

compare

protected static final boolean compare(float lhs,
                                       float rhs,
                                       CompareToOperator operator)

Compare the left-hand side value to the right-hand side value using the specified operator.

Parameters:

lhs - the value of the left-hand side.

rhs - the value of the right-hand side.

operator - the binary operator to apply for the comparison.

Returns:

true if the left-hand side compares true to the right-hand side. False otherwise.

inRange

protected static final boolean inRange(int min,
                                       int max,
                                       int value)

Test if the integer value is in the closed range between min and max.

Parameters:

min - the min

max - the max

value - the value

Returns:

boolean boolean

inRange

protected static final boolean inRange(float min,
                                       float max,
                                       float value)

Test if the floating point value is in the closed range between min and max.

Parameters:

min - the min

max - the max

value - the value

Returns:

boolean boolean

matchesGlob

protected static final <T> boolean matchesGlob(T value,
                                               String glob)

Test of the string representation of the supplied value matches the given glob expression.

Type Parameters:

T - the type parameter

Parameters:

value - the value

glob - the glob

Returns:

true if the value matches the glob.

See Also:

Wikipedia on Glob expressions.