ariba.util.expr
Class ExprContext

java.lang.Object
  ariba.util.expr.ExprContext

All Implemented Interfaces:

Map

public class ExprContext
extends Object
implements Map

This class defines the execution context for an AribaExpr expression

Author:

Luke Blanshard (blanshlu@netscape.net), Drew Davidson (drew@ognl.org)

Nested Class Summary

static interface

ExprContext.ExtensibleContext

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Field Summary

static String	CLASS_RESOLVER_CONTEXT_KEY
static String	CONTEXT_CONTEXT_KEY
static ClassResolver	DEFAULT_CLASS_RESOLVER
static MemberAccess	DEFAULT_MEMBER_ACCESS
static TypeConverter	DEFAULT_TYPE_CONVERTER
static String	KEEP_LAST_EVALUATION_CONTEXT_KEY
static String	LAST_EVALUATION_CONTEXT_KEY
static String	LOGIN_USER_CONTEXT_KEY
static String	MEMBER_ACCESS_CONTEXT_KEY
static String	ROOT_CONTEXT_KEY
static String	THIS_CONTEXT_KEY
static String	TRACE_EVALUATIONS_CONTEXT_KEY
static String	TYPE_CONVERTER_CONTEXT_KEY

Constructor Summary

ExprContext()
Constructs a new ExprContext with the default class resolver, type converter and member access.

ExprContext(ClassResolver classResolver, TypeConverter typeConverter, MemberAccess memberAccess)
Constructs a new ExprContext with the given class resolver, type converter and member access.

ExprContext(ClassResolver classResolver, TypeConverter typeConverter, MemberAccess memberAccess, Map values)

ExprContext(Map values)

ExprContext(SymbolTable symbolTable)

Method Summary

void	clear()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Set	entrySet()
boolean	equals(Object o)
Object	get(Object key)
ClassResolver	getClassResolver()
Evaluation	getCurrentEvaluation() Gets the current Evaluation from the top of the stack.
Node	getCurrentNode()
Object	getCurrentObject()
Evaluation	getEvaluation(int relativeIndex) Returns the Evaluation at the relative index given.
static ExprContext.ExtensibleContext	getExtensibleContext()
boolean	getKeepLastEvaluation() Returns true if the last evaluation that was done on this context is retained and available through getLastEvaluation().
Evaluation	getLastEvaluation()
static Object	getLoginUser()
static String	getLoginUserTypeName()
MemberAccess	getMemberAccess()
Object	getRoot()
Evaluation	getRootEvaluation() Gets the root of the evaluation stack.
Integer	getSymbolKind(Symbol symbol)
SymbolTable	getSymbolTable()
TypeInfo	getSymbolType(Symbol symbol)
boolean	getTraceEvaluations()
TypeConverter	getTypeConverter()
Map	getValues()
int	hashCode()
boolean	isEmpty()
Set	keySet()
Evaluation	popEvaluation() Pops the current Evaluation off of the top of the stack.
void	pushEvaluation(Evaluation value) Pushes a new Evaluation onto the stack.
Object	put(Object key, Object value)
void	putAll(Map t)
void	recycleLastEvaluation() This method can be called when the last evaluation has been used and can be returned for reuse in the free pool maintained by the runtime.
Object	remove(Object key)
void	setClassResolver(ClassResolver value)
void	setCurrentEvaluation(Evaluation value)
void	setCurrentNode(Node value)
void	setCurrentObject(Object value)
static void	setExtensibleContext(ExprContext.ExtensibleContext context)
void	setKeepLastEvaluation(boolean value) Sets whether the last evaluation that was done on this context is retained and available through getLastEvaluation().
void	setLastEvaluation(Evaluation value)
void	setMemberAccess(MemberAccess value)
void	setRoot(Object value)
void	setRootEvaluation(Evaluation value)
void	setTraceEvaluations(boolean value)
void	setTypeConverter(TypeConverter value)
void	setValues(Map value)
int	size()
Collection	values()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

CONTEXT_CONTEXT_KEY

public static final String CONTEXT_CONTEXT_KEY

See Also:

Constant Field Values

ROOT_CONTEXT_KEY

public static final String ROOT_CONTEXT_KEY

See Also:

Constant Field Values

THIS_CONTEXT_KEY

public static final String THIS_CONTEXT_KEY

See Also:

Constant Field Values

LOGIN_USER_CONTEXT_KEY

public static final String LOGIN_USER_CONTEXT_KEY

See Also:

Constant Field Values

TRACE_EVALUATIONS_CONTEXT_KEY

public static final String TRACE_EVALUATIONS_CONTEXT_KEY

See Also:

Constant Field Values

LAST_EVALUATION_CONTEXT_KEY

public static final String LAST_EVALUATION_CONTEXT_KEY

See Also:

Constant Field Values

KEEP_LAST_EVALUATION_CONTEXT_KEY

public static final String KEEP_LAST_EVALUATION_CONTEXT_KEY

See Also:

Constant Field Values

CLASS_RESOLVER_CONTEXT_KEY

public static final String CLASS_RESOLVER_CONTEXT_KEY

See Also:

Constant Field Values

TYPE_CONVERTER_CONTEXT_KEY

public static final String TYPE_CONVERTER_CONTEXT_KEY

See Also:

Constant Field Values

MEMBER_ACCESS_CONTEXT_KEY

public static final String MEMBER_ACCESS_CONTEXT_KEY

See Also:

Constant Field Values

DEFAULT_CLASS_RESOLVER

public static final ClassResolver DEFAULT_CLASS_RESOLVER

DEFAULT_TYPE_CONVERTER

public static final TypeConverter DEFAULT_TYPE_CONVERTER

DEFAULT_MEMBER_ACCESS

public static final MemberAccess DEFAULT_MEMBER_ACCESS

Constructor Detail

ExprContext

public ExprContext()

Constructs a new ExprContext with the default class resolver, type converter and member access.

ExprContext

public ExprContext(ClassResolver classResolver,
                   TypeConverter typeConverter,
                   MemberAccess memberAccess)

Constructs a new ExprContext with the given class resolver, type converter and member access. If any of these parameters is null the default will be used.

ExprContext

public ExprContext(Map values)

ExprContext

public ExprContext(ClassResolver classResolver,
                   TypeConverter typeConverter,
                   MemberAccess memberAccess,
                   Map values)

ExprContext

public ExprContext(SymbolTable symbolTable)

Method Detail

getExtensibleContext

public static ExprContext.ExtensibleContext getExtensibleContext()

setExtensibleContext

public static void setExtensibleContext(ExprContext.ExtensibleContext context)

setValues

public void setValues(Map value)

getValues

public Map getValues()

setClassResolver

public void setClassResolver(ClassResolver value)

getClassResolver

public ClassResolver getClassResolver()

setTypeConverter

public void setTypeConverter(TypeConverter value)

getTypeConverter

public TypeConverter getTypeConverter()

setMemberAccess

public void setMemberAccess(MemberAccess value)

getMemberAccess

public MemberAccess getMemberAccess()

getSymbolTable

public SymbolTable getSymbolTable()

setRoot

public void setRoot(Object value)

getRoot

public Object getRoot()

getTraceEvaluations

public boolean getTraceEvaluations()

setTraceEvaluations

public void setTraceEvaluations(boolean value)

getLastEvaluation

public Evaluation getLastEvaluation()

setLastEvaluation

public void setLastEvaluation(Evaluation value)

recycleLastEvaluation

public void recycleLastEvaluation()

This method can be called when the last evaluation has been used and can be returned for reuse in the free pool maintained by the runtime. This is not a necessary step, but is useful for keeping memory usage down. This will recycle the last evaluation and then set the last evaluation to null.

getKeepLastEvaluation

public boolean getKeepLastEvaluation()

Returns true if the last evaluation that was done on this context is retained and available through getLastEvaluation(). The default is true.

setKeepLastEvaluation

public void setKeepLastEvaluation(boolean value)

Sets whether the last evaluation that was done on this context is retained and available through getLastEvaluation(). The default is true.

setCurrentObject

public void setCurrentObject(Object value)

getCurrentObject

public Object getCurrentObject()

setCurrentNode

public void setCurrentNode(Node value)

getCurrentNode

public Node getCurrentNode()

getCurrentEvaluation

public Evaluation getCurrentEvaluation()

Gets the current Evaluation from the top of the stack. This is the Evaluation that is in process of evaluating.

setCurrentEvaluation

public void setCurrentEvaluation(Evaluation value)

getRootEvaluation

public Evaluation getRootEvaluation()

Gets the root of the evaluation stack. This Evaluation contains the node representing the root expression and the source is the root source object.

setRootEvaluation

public void setRootEvaluation(Evaluation value)

getEvaluation

public Evaluation getEvaluation(int relativeIndex)

Returns the Evaluation at the relative index given. This should be zero or a negative number as a relative reference back up the evaluation stack. Therefore getEvaluation(0) returns the current Evaluation.

pushEvaluation

public void pushEvaluation(Evaluation value)

Pushes a new Evaluation onto the stack. This is done before a node evaluates. When evaluation is complete it should be popped from the stack via popEvaluation().

popEvaluation

public Evaluation popEvaluation()

Pops the current Evaluation off of the top of the stack. This is done after a node has completed its evaluation.

size

public int size()

Specified by:

size in interface Map

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map

get

public Object get(Object key)

Specified by:

get in interface Map

put

public Object put(Object key,
                  Object value)

Specified by:

put in interface Map

remove

public Object remove(Object key)

Specified by:

remove in interface Map

putAll

public void putAll(Map t)

Specified by:

putAll in interface Map

clear

public void clear()

Specified by:

clear in interface Map

keySet

public Set keySet()

Specified by:

keySet in interface Map

values

public Collection values()

Specified by:

values in interface Map

entrySet

public Set entrySet()

Specified by:

entrySet in interface Map

equals

public boolean equals(Object o)

Specified by:

equals in interface Map

Overrides:

equals in class Object

hashCode

public int hashCode()

Specified by:

hashCode in interface Map

Overrides:

hashCode in class Object

getSymbolKind

public Integer getSymbolKind(Symbol symbol)

getSymbolType

public TypeInfo getSymbolType(Symbol symbol)

getLoginUserTypeName

public static String getLoginUserTypeName()

getLoginUser

public static Object getLoginUser()