com.bbn.openmap.layer.vpf
Class GeoSymAttExpression

java.lang.Object
  com.bbn.openmap.layer.vpf.GeoSymAttExpression

public class GeoSymAttExpression
extends java.lang.Object

This parser class takes a string representing a logic statement and parses it into objects that can be used for evaluating attributes of features. It's based on expressions specified in the GeoSym Handbook MIL-HDBK-857A.

It can parse the expression given per the specification, such as 42|1|bfc|1|0|1, or the strings specified in the symbol tables in the MIL-DTL-89045A, like bfc=81 AND sta<>0and<>1and<>2and<>3and<>5and<>6and<>11.

Author:

dietrick

Nested Class Summary

static class	GeoSymAttExpression.ColumnExpression A ColumnExpression is the comparison of an FCI column value against another column value.
static class	GeoSymAttExpression.CompareExpression
static class	GeoSymAttExpression.Connector Connector class is the part of the expression that contains the logic operation, AND, OR, and and or.
static class	GeoSymAttExpression.ECDISExpression The ECDISExpression checks the warehouse for user set values when evaluating.
static interface	GeoSymAttExpression.Expression The Expression interface allows for the recursive queries of Connectors and Value/CompareExpressions.
static class	GeoSymAttExpression.StringExpression The ECDISExpression checks the warehouse for user set values when evaluating.
static class	GeoSymAttExpression.ValueExpression The ValueExpression is a comparison of a FCI value to a numerical value.

Field Summary

static int	and_CONN
static int	AND_CONN
static int	EQUALS_OP
protected GeoSymAttExpression.Expression	exp
static int	GREATER_THAN_OP
static int	GT_EQUALS_OP
static int	LESS_THAN_OP
static int	LT_EQUALS_OP
static int	NO_OP
static int	NONE_CONN
static int	NOT_EQUALS_OP
protected static java.lang.String[]	ops The NOOP goes first to preserve the index value of each operator, as specifed in the GeoSym spec.
static int	or_CONN
static int	OR_CONN
protected VPFAutoFeatureGraphicWarehouse	warehouse

Constructor Summary

GeoSymAttExpression(java.lang.String source, VPFAutoFeatureGraphicWarehouse warehouse)
Create the expression object given a text representation of it.

Method Summary

boolean	evaluate(FeatureClassInfo fci, int row) Does the feature in row of fci pass the conditions of this expression.
boolean	evaluate(FeatureClassInfo fci, java.util.List<java.lang.Object> row) This one is used by the CoverageTable.
protected GeoSymAttExpression.Expression	findExpression(java.lang.String source) Recursive parsing statement.
protected GeoSymAttExpression.Expression	findMathOp(java.lang.String source)
protected GeoSymAttExpression.Connector	findMiniOp(java.lang.String source)
protected GeoSymAttExpression.Connector	findOp(java.lang.String source)
static void	main(java.lang.String[] args)
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

NO_OP

public static final int NO_OP

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Constant Field Values

EQUALS_OP

public static final int EQUALS_OP

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Constant Field Values

NOT_EQUALS_OP

public static final int NOT_EQUALS_OP

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Constant Field Values

LESS_THAN_OP

public static final int LESS_THAN_OP

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Constant Field Values

GREATER_THAN_OP

public static final int GREATER_THAN_OP

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Constant Field Values

LT_EQUALS_OP

public static final int LT_EQUALS_OP

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Constant Field Values

GT_EQUALS_OP

public static final int GT_EQUALS_OP

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Constant Field Values

NONE_CONN

public static final int NONE_CONN

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Constant Field Values

or_CONN

public static final int or_CONN

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Constant Field Values

AND_CONN

public static final int AND_CONN

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Constant Field Values

and_CONN

public static final int and_CONN

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Constant Field Values

OR_CONN

public static final int OR_CONN

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Constant Field Values

warehouse

protected VPFAutoFeatureGraphicWarehouse warehouse

exp

protected GeoSymAttExpression.Expression exp

ops

protected static java.lang.String[] ops

The NOOP goes first to preserve the index value of each operator, as specifed in the GeoSym spec.

Constructor Detail

GeoSymAttExpression

public GeoSymAttExpression(java.lang.String source,
                           VPFAutoFeatureGraphicWarehouse warehouse)

Create the expression object given a text representation of it.

Parameters:

source -

warehouse - used to resolve the ECDIS variables.

Method Detail

findOp

protected GeoSymAttExpression.Connector findOp(java.lang.String source)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

findMiniOp

protected GeoSymAttExpression.Connector findMiniOp(java.lang.String source)

findMathOp

protected GeoSymAttExpression.Expression findMathOp(java.lang.String source)

findExpression

protected GeoSymAttExpression.Expression findExpression(java.lang.String source)

Recursive parsing statement. Keys on Connectors (AND, OR) and builds Expressions based on those. Then looks for mini connectors (and, or) and builds on those. Of course, there might just be one expression here, one that is separated by an operator.

Parameters:

source -

Returns:

Expression tree

evaluate

public boolean evaluate(FeatureClassInfo fci,
                        int row)

Does the feature in row of fci pass the conditions of this expression.

Parameters:

fci -

row -

Returns:

true if row contents passes evaluation

evaluate

public boolean evaluate(FeatureClassInfo fci,
                        java.util.List<java.lang.Object> row)

This one is used by the CoverageTable. Does the feature in row of fci pass the conditions of this expression.

Parameters:

fci -

row -

Returns:

true if row passes evaluation

main

public static void main(java.lang.String[] args)