org.eclipse.equinox.internal.p2.metadata.expression

Class Expression

java.lang.Object

org.eclipse.equinox.internal.p2.metadata.expression.Expression

All Implemented Interfaces:

java.lang.Comparable<Expression>, IExpressionConstants, IExpression

Direct Known Subclasses:

Binary, Literal, NAry, Parameter, Unary, Variable

public abstract class Expression
extends java.lang.Object
implements IExpression, java.lang.Comparable<Expression>, IExpressionConstants

The base class of the expression tree.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Expression.VariableFinder

Field Summary

Fields inherited from interface org.eclipse.equinox.p2.metadata.expression.IExpression

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

Fields inherited from interface org.eclipse.equinox.internal.p2.metadata.expression.IExpressionConstants

KEYWORD_ALL, KEYWORD_BOOLEAN, KEYWORD_CLASS, KEYWORD_COLLECT, KEYWORD_EXISTS, KEYWORD_FALSE, KEYWORD_FILTER, KEYWORD_FIRST, KEYWORD_FLATTEN, KEYWORD_INTERSECT, KEYWORD_IQUERY, KEYWORD_LATEST, KEYWORD_LIMIT, KEYWORD_LOCALIZED_KEYS, KEYWORD_LOCALIZED_MAP, KEYWORD_LOCALIZED_PROPERTY, KEYWORD_NULL, KEYWORD_RANGE, KEYWORD_SATISFIES_ALL, KEYWORD_SATISFIES_ANY, KEYWORD_SELECT, KEYWORD_SET, KEYWORD_TRAVERSE, KEYWORD_TRUE, KEYWORD_UNION, KEYWORD_UNIQUE, KEYWORD_VERSION, OPERATOR_AND, OPERATOR_ARRAY, OPERATOR_ASSIGN, OPERATOR_AT, OPERATOR_EACH, OPERATOR_ELSE, OPERATOR_EQUALS, OPERATOR_GT, OPERATOR_GT_EQUAL, OPERATOR_IF, OPERATOR_LT, OPERATOR_LT_EQUAL, OPERATOR_MATCHES, OPERATOR_MEMBER, OPERATOR_NOT, OPERATOR_NOT_EQUALS, OPERATOR_OR, OPERATOR_PARAMETER, PRIORITY_AND, PRIORITY_ASSIGNMENT, PRIORITY_BINARY, PRIORITY_COLLECTION, PRIORITY_COMMA, PRIORITY_CONDITION, PRIORITY_FUNCTION, PRIORITY_LAMBDA, PRIORITY_LITERAL, PRIORITY_MAX, PRIORITY_MEMBER, PRIORITY_NOT, PRIORITY_OR, PRIORITY_VARIABLE, VARIABLE_EVERYTHING, VARIABLE_THIS

Constructor Summary

Constructors

Constructor and Description
Expression()

Method Summary

Modifier and Type	Method and Description
boolean	accept(IExpressionVisitor visitor) Let the visitor visit this instance and all expressions that this instance contains.
static void	appendOperand(java.lang.StringBuffer bld, Variable rootVariable, Expression operand, int priority)
static Expression[]	assertLength(Expression[] operands, int minLength, int maxLength, java.lang.String operand)
static Expression[]	assertLength(Expression[] operands, int length, java.lang.String operand)
static int	compare(Expression[] arr1, Expression[] arr2)
int	compareTo(Expression e)
static void	elementsToString(java.lang.StringBuffer bld, Variable rootVariable, Expression[] elements)
static boolean	equals(Expression[] arr1, Expression[] arr2)
boolean	equals(java.lang.Object e)
abstract java.lang.Object	evaluate(IEvaluationContext context) Evaluate this expression with given context and variables.
java.util.Iterator<?>	evaluateAsIterator(IEvaluationContext context)
static java.util.List<java.lang.String>	getIndexCandidateMembers(java.lang.Class<?> elementClass, Variable itemVariable, Expression operand)
abstract java.lang.String	getOperator()
abstract int	getPriority()
static int	hashCode(Expression[] arr)
boolean	isReferenceTo(Variable variable)
boolean	needsTranslationSupport() Checks if the expression will make repeated requests for the 'everything' iterator.
java.lang.String	toLDAPString()
void	toLDAPString(java.lang.StringBuffer buf) Appends the an LDAP filter representation of this expression to the collector.
java.lang.String	toString()
void	toString(java.lang.StringBuffer bld) Appends the string representation of this expression to the collector collector.
abstract void	toString(java.lang.StringBuffer bld, Variable rootVariable)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.equinox.p2.metadata.expression.IExpression

getExpressionType

Constructor Detail

Expression

public Expression()

Method Detail

appendOperand

public static void appendOperand(java.lang.StringBuffer bld,
                                 Variable rootVariable,
                                 Expression operand,
                                 int priority)

assertLength

public static Expression[] assertLength(Expression[] operands,
                                        int minLength,
                                        int maxLength,
                                        java.lang.String operand)

assertLength

public static Expression[] assertLength(Expression[] operands,
                                        int length,
                                        java.lang.String operand)

compare

public static int compare(Expression[] arr1,
                          Expression[] arr2)

equals

public static boolean equals(Expression[] arr1,
                             Expression[] arr2)

hashCode

public static int hashCode(Expression[] arr)

elementsToString

public static void elementsToString(java.lang.StringBuffer bld,
                                    Variable rootVariable,
                                    Expression[] elements)

getIndexCandidateMembers

public static java.util.List<java.lang.String> getIndexCandidateMembers(java.lang.Class<?> elementClass,
                                                                        Variable itemVariable,
                                                                        Expression operand)

accept

public boolean accept(IExpressionVisitor visitor)

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

Specified by:

accept in interface IExpression

Parameters:

visitor - The visiting visitor.

Returns:

true if the visitor should continue visiting, false otherwise.

compareTo

public int compareTo(Expression e)

Specified by:

compareTo in interface java.lang.Comparable<Expression>

equals

public boolean equals(java.lang.Object e)

Overrides:

equals in class java.lang.Object

evaluate

public abstract java.lang.Object evaluate(IEvaluationContext context)

Evaluate this expression with given context and variables.

Specified by:

evaluate in interface IExpression

Parameters:

context - The evaluation context

Returns:

The result of the evaluation.

evaluateAsIterator

public java.util.Iterator<?> evaluateAsIterator(IEvaluationContext context)

getOperator

public abstract java.lang.String getOperator()

getPriority

public abstract int getPriority()

isReferenceTo

public boolean isReferenceTo(Variable variable)

toLDAPString

public final java.lang.String toLDAPString()

toLDAPString

public void toLDAPString(java.lang.StringBuffer buf)

Description copied from interface: IExpression

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

Specified by:

toLDAPString in interface IExpression

toString

public final java.lang.String toString()

Overrides:

toString in class java.lang.Object

toString

public void toString(java.lang.StringBuffer bld)

Description copied from interface: IExpression

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

Specified by:

toString in interface IExpression

toString

public abstract void toString(java.lang.StringBuffer bld,
                              Variable rootVariable)

needsTranslationSupport

public boolean needsTranslationSupport()

Checks if the expression will make repeated requests for the 'everything' iterator.

Returns:

true if repeated requests will be made, false if not.