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

TYPE_ALL

static final int TYPE_ALL

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TYPE_AND

static final int TYPE_AND

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TYPE_AT

static final int TYPE_AT

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TYPE_EQUALS

static final int TYPE_EQUALS

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TYPE_EXISTS

static final int TYPE_EXISTS

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TYPE_GREATER

static final int TYPE_GREATER

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TYPE_GREATER_EQUAL

static final int TYPE_GREATER_EQUAL

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TYPE_LAMBDA

static final int TYPE_LAMBDA

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TYPE_LESS

static final int TYPE_LESS

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TYPE_LESS_EQUAL

static final int TYPE_LESS_EQUAL

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TYPE_LITERAL

static final int TYPE_LITERAL

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TYPE_MATCHES

static final int TYPE_MATCHES

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TYPE_MEMBER

static final int TYPE_MEMBER

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TYPE_NOT

static final int TYPE_NOT

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TYPE_NOT_EQUALS

static final int TYPE_NOT_EQUALS

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TYPE_OR

static final int TYPE_OR

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TYPE_PARAMETER

static final int TYPE_PARAMETER

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TYPE_VARIABLE

static final int TYPE_VARIABLE

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TYPE_ARRAY

static final int TYPE_ARRAY

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TYPE_ASSIGNMENT

static final int TYPE_ASSIGNMENT

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TYPE_COLLECT

static final int TYPE_COLLECT

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TYPE_CONDITION

static final int TYPE_CONDITION

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TYPE_FIRST

static final int TYPE_FIRST

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TYPE_FLATTEN

static final int TYPE_FLATTEN

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TYPE_FUNCTION

static final int TYPE_FUNCTION

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TYPE_INTERSECT

static final int TYPE_INTERSECT

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TYPE_LATEST

static final int TYPE_LATEST

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TYPE_LIMIT

static final int TYPE_LIMIT

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TYPE_PIPE

static final int TYPE_PIPE

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TYPE_SELECT

static final int TYPE_SELECT

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TYPE_TRAVERSE

static final int TYPE_TRAVERSE

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TYPE_UNION

static final int TYPE_UNION

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TYPE_UNIQUE

static final int TYPE_UNIQUE

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Method Detail

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