com.pega.pegarules.pub.generator
Interface Expression

All Known Subinterfaces:

StringExpression

public interface Expression

The Expression interface is the basis for identifying values that are encountered during Java generation. Both compile time literals and expressions to be evaluated at run time can be represented.

Actual instances of Expression implement interfaces that extend it, specific to the value type represented. In addition to the methods described here, these extending interfaces should also define:

• methods representing the basic operations appropriate to the value type
• a toTypeName method that returns the value identified by the expression when isLiteral() returns true

Instances of these interfaces are supplied by methods of the FirstUseAssembler interface.

Version:

$Revision: 31 $ $Date: 2009-06-24 09:38:04 -0400 (Wed, 24 Jun 2009) $

Author:

John van der Meer

Field Summary

static java.lang.String	COPYRIGHT
static byte	EXPR_BOOLEAN The value of the expression is a boolean.
static byte	EXPR_INTEGER The value of the expression is an int.
static byte	EXPR_PROPERTY The value of the expression is a ClipboardProperty.
static byte	EXPR_STRING The value of the expression is a java.lang.String.
static java.lang.String	VERSION

Method Summary

void	addExpression(boolean aToPrimary, boolean aClosed) Adds a Java representation of this expression to the code being generated.
byte	getType() Identifies the value type represented by this instance.
boolean	isExpression() Indicates whether the value of this expression depends on information that is only available at runtime.
boolean	isLiteral() Indicates whether the value of this expression is known at assembly time.

Field Detail

COPYRIGHT

static final java.lang.String COPYRIGHT

See Also:

Constant Field Values

VERSION

static final java.lang.String VERSION

See Also:

Constant Field Values

EXPR_STRING

static final byte EXPR_STRING

The value of the expression is a java.lang.String.

See Also:

Constant Field Values

EXPR_BOOLEAN

static final byte EXPR_BOOLEAN

The value of the expression is a boolean.

See Also:

Constant Field Values

EXPR_INTEGER

static final byte EXPR_INTEGER

The value of the expression is an int.

See Also:

Constant Field Values

EXPR_PROPERTY

static final byte EXPR_PROPERTY

The value of the expression is a ClipboardProperty.

See Also:

Constant Field Values

Method Detail

getType

byte getType()

Identifies the value type represented by this instance.

Returns:

One of the EXPR_* values, representing the value type of the expression.

addExpression

void addExpression(boolean aToPrimary,
                   boolean aClosed)

Adds a Java representation of this expression to the code being generated.

Parameters:

aToPrimary - true if code should be added to the Primary Code path; false if it should be added to the Support Code

aClosed - true if the code must be syntactically distinct (because it is being used as part of a larger expression); false if the context establishes the distinctness of the expression

isLiteral

boolean isLiteral()

Indicates whether the value of this expression is known at assembly time.

Returns:

true if this value is known at assembly time; false if the value requires runtime evaluation

See Also:

isExpression()

isExpression

boolean isExpression()

Indicates whether the value of this expression depends on information that is only available at runtime.

Returns:

true if this value requires runtime evaluation; false if the value is known at assembly time

See Also:

isLiteral()