bboss.org.apache.velocity.runtime.parser.node

类 ASTReference

java.lang.Object

bboss.org.apache.velocity.runtime.parser.node.SimpleNode

bboss.org.apache.velocity.runtime.parser.node.ASTReference

所有已实现的接口:

Node, Renderable

public class ASTReference
extends SimpleNode

This class is responsible for handling the references in VTL ($foo). Please look at the Parser.jjt file which is what controls the generation of this class.

字段概要

字段

限定符和类型	字段和说明
boolean	strictEscape Indicates if we are using modified escape behavior in strict mode.
boolean	strictRef Indicates if we are running in strict reference mode.
boolean	toStringNullCheck Indicates if toString() should be called during condition evaluation just to ensure it does not return null.
protected Info	uberInfo

从类继承的字段 bboss.org.apache.velocity.runtime.parser.node.SimpleNode

children, first, id, info, invalid, last, log, parent, parser, rsvc, state, templateName

构造器概要

构造器

构造器和说明
ASTReference(int id)
ASTReference(Parser p, int id)

方法概要

限定符和类型	方法和说明
boolean	evaluate(InternalContextAdapter context) Computes boolean value of this reference Returns the actual value of reference return type boolean, and 'true' if value is not null
java.lang.Object	execute(java.lang.Object o, InternalContextAdapter context) gets an Object that 'is' the value of the reference
java.lang.String	getDollarBang()
java.lang.String	getRootString() Returns the 'root string', the reference key
java.lang.Object	getVariableValue(Context context, java.lang.String variable)
java.lang.Object	init(InternalContextAdapter context, java.lang.Object data)
java.lang.Object	jjtAccept(ParserVisitor visitor, java.lang.Object data)
static java.lang.String	printClass(java.lang.Class clazz) Utility class to handle nulls when printing a class type
boolean	render(InternalContextAdapter context, java.io.Writer writer) gets the value of the reference and outputs it to the writer.
boolean	setValue(InternalContextAdapter context, java.lang.Object value) Sets the value of a complex reference (something like $foo.bar) Currently used by ASTSetReference()
java.lang.Object	value(InternalContextAdapter context)

从类继承的方法 bboss.org.apache.velocity.runtime.parser.node.SimpleNode

childrenAccept, dump, getChildren, getColumn, getFirstToken, getInfo, getLastToken, getLine, getLocation, getRuntimeServices, getTemplateName, getType, isInvalid, jjtAddChild, jjtClose, jjtGetChild, jjtGetNumChildren, jjtGetParent, jjtOpen, jjtSetParent, literal, setFirstToken, setInfo, setInvalid, toString, toString

从类继承的方法 java.lang.Object

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

字段详细资料

strictRef

public boolean strictRef

Indicates if we are running in strict reference mode.

strictEscape

public boolean strictEscape

Indicates if we are using modified escape behavior in strict mode. mainly we allow \$abc -> to render as $abc

toStringNullCheck

public boolean toStringNullCheck

Indicates if toString() should be called during condition evaluation just to ensure it does not return null. Check is unnecessary if all toString() implementations are known to have non-null return values. Disabling the check will give a performance improval since toString() may be a complex operation on large objects.

uberInfo

protected Info uberInfo

构造器详细资料

ASTReference

public ASTReference(int id)

参数:

id -

ASTReference

public ASTReference(Parser p,
                    int id)

参数:

p -

id -

方法详细资料

jjtAccept

public java.lang.Object jjtAccept(ParserVisitor visitor,
                                  java.lang.Object data)

指定者:

jjtAccept 在接口中 Node

覆盖:

jjtAccept 在类中 SimpleNode

返回:

The Node execution result object.

另请参阅:

SimpleNode.jjtAccept(bboss.org.apache.velocity.runtime.parser.node.ParserVisitor, java.lang.Object)

init

public java.lang.Object init(InternalContextAdapter context,
                             java.lang.Object data)
                      throws TemplateInitException

指定者:

init 在接口中 Node

覆盖:

init 在类中 SimpleNode

返回:

The init result.

抛出:

TemplateInitException

另请参阅:

SimpleNode.init(bboss.org.apache.velocity.context.InternalContextAdapter, java.lang.Object)

getRootString

public java.lang.String getRootString()

Returns the 'root string', the reference key

返回:

the root string.

execute

public java.lang.Object execute(java.lang.Object o,
                                InternalContextAdapter context)
                         throws MethodInvocationException

gets an Object that 'is' the value of the reference

指定者:

execute 在接口中 Node

覆盖:

execute 在类中 SimpleNode

参数:

o - unused Object parameter

context - context used to generate value

返回:

The execution result.

抛出:

MethodInvocationException

另请参阅:

Node.execute(java.lang.Object, bboss.org.apache.velocity.context.InternalContextAdapter)

render

public boolean render(InternalContextAdapter context,
                      java.io.Writer writer)
               throws java.io.IOException,
                      MethodInvocationException

gets the value of the reference and outputs it to the writer.

指定者:

render 在接口中 Node

指定者:

render 在接口中 Renderable

覆盖:

render 在类中 SimpleNode

参数:

context - context of data to use in getting value

writer - writer to render to

返回:

True if rendering was successful.

抛出:

java.io.IOException

MethodInvocationException

另请参阅:

Node.render(bboss.org.apache.velocity.context.InternalContextAdapter, java.io.Writer)

evaluate

public boolean evaluate(InternalContextAdapter context)
                 throws MethodInvocationException

Computes boolean value of this reference Returns the actual value of reference return type boolean, and 'true' if value is not null

指定者:

evaluate 在接口中 Node

覆盖:

evaluate 在类中 SimpleNode

参数:

context - context to compute value with

返回:

True if evaluation was ok.

抛出:

MethodInvocationException

另请参阅:

Node.evaluate(bboss.org.apache.velocity.context.InternalContextAdapter)

value

public java.lang.Object value(InternalContextAdapter context)
                       throws MethodInvocationException

指定者:

value 在接口中 Node

覆盖:

value 在类中 SimpleNode

返回:

The node value.

抛出:

MethodInvocationException

另请参阅:

SimpleNode.value(bboss.org.apache.velocity.context.InternalContextAdapter)

printClass

public static java.lang.String printClass(java.lang.Class clazz)

Utility class to handle nulls when printing a class type

setValue

public boolean setValue(InternalContextAdapter context,
                        java.lang.Object value)
                 throws MethodInvocationException

Sets the value of a complex reference (something like $foo.bar) Currently used by ASTSetReference()

参数:

context - context object containing this reference

value - Object to set as value

返回:

true if successful, false otherwise

抛出:

MethodInvocationException

另请参阅:

ASTSetDirective

getVariableValue

public java.lang.Object getVariableValue(Context context,
                                         java.lang.String variable)
                                  throws MethodInvocationException

参数:

context -

variable -

返回:

The evaluated value of the variable.

抛出:

MethodInvocationException

getDollarBang

public java.lang.String getDollarBang()