Package org.eclipse.equinox.p2.metadata.expression

Interface IExpression

All Known Subinterfaces:

IContextExpression<T>, IFilterExpression, IMatchExpression<T>

public interface IExpression

A node in the expression tree

Since:

2.0

Restriction:

This interface is not intended to be implemented directly by clients.

Restriction:

This interface is not intended to be extended directly by clients.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	TYPE_ALL
static final int	TYPE_AND
static final int	TYPE_ARRAY
static final int	TYPE_ASSIGNMENT
static final int	TYPE_AT
static final int	TYPE_COLLECT
static final int	TYPE_CONDITION
static final int	TYPE_EQUALS
static final int	TYPE_EXISTS
static final int	TYPE_FIRST
static final int	TYPE_FLATTEN
static final int	TYPE_FUNCTION
static final int	TYPE_GREATER
static final int	TYPE_GREATER_EQUAL
static final int	TYPE_INTERSECT
static final int	TYPE_LAMBDA
static final int	TYPE_LATEST
static final int	TYPE_LESS
static final int	TYPE_LESS_EQUAL
static final int	TYPE_LIMIT
static final int	TYPE_LITERAL
static final int	TYPE_MATCHES
static final int	TYPE_MEMBER
static final int	TYPE_NOT
static final int	TYPE_NOT_EQUALS
static final int	TYPE_OR
static final int	TYPE_PARAMETER
static final int	TYPE_PIPE
static final int	TYPE_SELECT
static final int	TYPE_TRAVERSE
static final int	TYPE_UNION
static final int	TYPE_UNIQUE
static final int	TYPE_VARIABLE

Method Summary

Modifier and Type	Method	Description
boolean	accept(IExpressionVisitor visitor)	Let the visitor visit this instance and all expressions that this instance contains.
Object	evaluate(IEvaluationContext context)	Evaluate this expression with given context and variables.
int	getExpressionType()	Returns the expression type (see TYPE_xxx constants).
void	toLDAPString(StringBuffer collector)	Appends the an LDAP filter representation of this expression to the collector.
void	toString(StringBuffer collector)	Appends the string representation of this expression to the collector collector.

Field Details

TYPE_ALL

static final int TYPE_ALL

See Also:

• Constant Field Values

TYPE_AND

static final int TYPE_AND

See Also:

• Constant Field Values

TYPE_AT

static final int TYPE_AT

See Also:

• Constant Field Values

TYPE_EQUALS

static final int TYPE_EQUALS

See Also:

• Constant Field Values

TYPE_EXISTS

static final int TYPE_EXISTS

See Also:

• Constant Field Values

TYPE_GREATER

static final int TYPE_GREATER

See Also:

• Constant Field Values

TYPE_GREATER_EQUAL

static final int TYPE_GREATER_EQUAL

See Also:

• Constant Field Values

TYPE_LAMBDA

static final int TYPE_LAMBDA

See Also:

• Constant Field Values

TYPE_LESS

static final int TYPE_LESS

See Also:

• Constant Field Values

TYPE_LESS_EQUAL

static final int TYPE_LESS_EQUAL

See Also:

• Constant Field Values

TYPE_LITERAL

static final int TYPE_LITERAL

See Also:

• Constant Field Values

TYPE_MATCHES

static final int TYPE_MATCHES

See Also:

• Constant Field Values

TYPE_MEMBER

static final int TYPE_MEMBER

See Also:

• Constant Field Values

TYPE_NOT

static final int TYPE_NOT

See Also:

• Constant Field Values

TYPE_NOT_EQUALS

static final int TYPE_NOT_EQUALS

See Also:

• Constant Field Values

TYPE_OR

static final int TYPE_OR

See Also:

• Constant Field Values

TYPE_PARAMETER

static final int TYPE_PARAMETER

See Also:

• Constant Field Values

TYPE_VARIABLE

static final int TYPE_VARIABLE

See Also:

• Constant Field Values

TYPE_ARRAY

static final int TYPE_ARRAY

See Also:

• Constant Field Values

TYPE_ASSIGNMENT

static final int TYPE_ASSIGNMENT

See Also:

• Constant Field Values

TYPE_COLLECT

static final int TYPE_COLLECT

See Also:

• Constant Field Values

TYPE_CONDITION

static final int TYPE_CONDITION

See Also:

• Constant Field Values

TYPE_FIRST

static final int TYPE_FIRST

See Also:

• Constant Field Values

TYPE_FLATTEN

static final int TYPE_FLATTEN

See Also:

• Constant Field Values

TYPE_FUNCTION

static final int TYPE_FUNCTION

See Also:

• Constant Field Values

TYPE_INTERSECT

static final int TYPE_INTERSECT

See Also:

• Constant Field Values

TYPE_LATEST

static final int TYPE_LATEST

See Also:

• Constant Field Values

TYPE_LIMIT

static final int TYPE_LIMIT

See Also:

• Constant Field Values

TYPE_PIPE

static final int TYPE_PIPE

See Also:

• Constant Field Values

TYPE_SELECT

static final int TYPE_SELECT

See Also:

• Constant Field Values

TYPE_TRAVERSE

static final int TYPE_TRAVERSE

See Also:

• Constant Field Values

TYPE_UNION

static final int TYPE_UNION

See Also:

• Constant Field Values

TYPE_UNIQUE

static final int TYPE_UNIQUE

See Also:

• Constant Field Values

Method Details

accept

boolean accept(IExpressionVisitor visitor)

Let the visitor visit this instance and all expressions that this instance contains.

Parameters:

visitor - The visiting visitor.

Returns:

true if the visitor should continue visiting, false otherwise.

evaluate

Object evaluate(IEvaluationContext context)

Evaluate this expression with given context and variables.

Parameters:

context - The evaluation context

Returns:

The result of the evaluation.

getExpressionType

int getExpressionType()

Returns the expression type (see TYPE_xxx constants).

toString

void toString(StringBuffer collector)

Appends the string representation of this expression to the collector collector.

toLDAPString

void toLDAPString(StringBuffer collector)

Appends the an LDAP filter representation of this expression to the collector.

Throws:

UnsupportedOperationException - if the expression contains nodes that cannot be represented in an LDAP filter