Package org.apache.velocity.runtime
Interface RuntimeServices
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- All Known Implementing Classes:
RuntimeInstance
public interface RuntimeServices
Interface for internal runtime services that are needed by the various components w/in Velocity. This was taken from the old Runtime singleton, and anything not necessary was removed. Currently implemented by RuntimeInstance.- Version:
- $Id$
- Author:
- Geir Magusson Jr.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description void
addProperty(String key, Object value)
Add a property to the configuration.boolean
addVelocimacro(String name, Node macro, List<Macro.MacroArg> macroArgs, Template definingTemplate)
Adds a new Velocimacro.void
clearProperty(String key)
Clear the values pertaining to a particular property.Parser
createNewParser()
Create a new parser instance.boolean
evaluate(Context context, Writer writer, String logTag, Reader reader)
Renders the input reader using the context into the output writer.boolean
evaluate(Context context, Writer out, String logTag, String instring)
Renders the input string using the context into the output writer.Object
getApplicationAttribute(Object key)
Return the specified application attribute.EventCartridge
getApplicationEventCartridge()
Returns the event handlers for the application.boolean
getBoolean(String key, boolean def)
Boolean property accessor method to hide the configuration implementation.ExtProperties
getConfiguration()
Return the velocity runtime configuration object.ContentResource
getContent(String name)
Returns a static content resource from the resource manager.ContentResource
getContent(String name, String encoding)
Returns a static content resource from the resource manager.Directive
getDirective(String name)
Retrieve a previously instantiated directive.int
getInt(String key)
Int property accessor method to hide the configuration implementation.int
getInt(String key, int defaultValue)
Int property accessor method to hide the configuration implementation.String
getLoaderNameForResource(String resourceName)
Determines is a template exists, and returns name of the loader that provides it.org.slf4j.Logger
getLog()
Returns the configured logger.org.slf4j.Logger
getLog(String childNamespace)
Get a logger for the specified child namespace.LogContext
getLogContext()
Get the LogContext object used to tack locations in templates.ParserConfiguration
getParserConfiguration()
Get the replacement characters configured for this runtime service's parserObject
getProperty(String key)
Allows an external caller to get a property.RuntimeConstants.SpaceGobbling
getSpaceGobbling()
get space gobbling modeString
getString(String key)
String property accessor method to hide the configuration implementationString
getString(String key, String defaultValue)
String property accessor method with default to hide the configuration implementation.Template
getTemplate(String name)
Returns aTemplate
from the resource manager.Template
getTemplate(String name, String encoding)
Returns aTemplate
from the resource managerUberspect
getUberspect()
Returns the configured class introspection/reflection implementation.Directive
getVelocimacro(String vmName, Template renderingTemplate, Template template)
Returns the appropriate VelocimacroProxy object if strVMname is a valid current Velocimacro.void
init()
This is the primary initialization method in the Velocity Runtime.void
init(String configurationFile)
Initialize the Velocity Runtime with the name of ExtProperties object.void
init(Properties p)
Initialize the Velocity Runtime with a Properties object.boolean
invokeVelocimacro(String vmName, String logTag, String[] params, Context context, Writer writer)
Invokes a currently registered Velocimacro with the params provided and places the rendered stream into the writer.boolean
isHyphenAllowedInIdentifiers()
Get whether hyphens are allowed in identifiersboolean
isInitialized()
Returns true if the RuntimeInstance has been successfully initialized.boolean
isScopeControlEnabled(String scopeName)
Get whether to provide a scope control object for this scopeboolean
isVelocimacro(String vmName, Template template)
Checks to see if a VM existsSimpleNode
parse(Reader reader, Template template)
Parse the input and return the root of AST node structure.Object
setApplicationAttribute(Object key, Object value)
Set the specified application attribute.void
setConfiguration(ExtProperties configuration)
Allow an external system to set an ExtProperties object to use.void
setProperty(String key, Object value)
Allows an external system to set a property in the Velocity Runtime.boolean
useStringInterning()
Check whether the engine uses string interning
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Method Detail
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init
void init()
This is the primary initialization method in the Velocity Runtime. The systems that are setup/initialized here are as follows:- Logging System
- ResourceManager
- Parser Pool
- Global Cache
- Static Content Include System
- Velocimacro System
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setProperty
void setProperty(String key, Object value)
Allows an external system to set a property in the Velocity Runtime.- Parameters:
key
- property keyvalue
- property value
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setConfiguration
void setConfiguration(ExtProperties configuration)
Allow an external system to set an ExtProperties object to use.- Parameters:
configuration
-- Since:
- 2.0
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addProperty
void addProperty(String key, Object value)
Add a property to the configuration. If it already exists then the value stated here will be added to the configuration entry. For example, if resource.loader = file is already present in the configuration and you addProperty("resource.loader", "classpath") Then you will end up with a Vector like the following: ["file", "classpath"]- Parameters:
key
-value
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clearProperty
void clearProperty(String key)
Clear the values pertaining to a particular property.- Parameters:
key
- of property to clear
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getProperty
Object getProperty(String key)
Allows an external caller to get a property. The calling routine is required to know the type, as this routine will return an Object, as that is what properties can be.- Parameters:
key
- property to return- Returns:
- The value.
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init
void init(Properties p)
Initialize the Velocity Runtime with a Properties object.- Parameters:
p
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init
void init(String configurationFile)
Initialize the Velocity Runtime with the name of ExtProperties object.- Parameters:
configurationFile
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parse
SimpleNode parse(Reader reader, Template template) throws ParseException
Parse the input and return the root of AST node structure.
In the event that it runs out of parsers in the pool, it will create and let them be GC'd dynamically, logging that it has to do that. This is considered an exceptional condition. It is expected that the user will set the PARSER_POOL_SIZE property appropriately for their application. We will revisit this.- Parameters:
reader
- inputstream retrieved by a resource loadertemplate
- template being parsed- Returns:
- The AST representing the template.
- Throws:
ParseException
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evaluate
boolean evaluate(Context context, Writer out, String logTag, String instring)
Renders the input string using the context into the output writer. To be used when a template is dynamically constructed, or want to use Velocity as a token replacer.- Parameters:
context
- context to use in rendering input stringout
- Writer in which to render the outputlogTag
- string to be used as the template name for log messages in case of errorinstring
- input string containing the VTL to be rendered- Returns:
- true if successful, false otherwise. If false, see Velocity runtime log
- Throws:
ParseErrorException
- The template could not be parsed.MethodInvocationException
- A method on a context object could not be invoked.ResourceNotFoundException
- A referenced resource could not be loaded.- Since:
- Velocity 1.6
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evaluate
boolean evaluate(Context context, Writer writer, String logTag, Reader reader)
Renders the input reader using the context into the output writer. To be used when a template is dynamically constructed, or want to use Velocity as a token replacer.- Parameters:
context
- context to use in rendering input stringwriter
- Writer in which to render the outputlogTag
- string to be used as the template name for log messages in case of errorreader
- Reader containing the VTL to be rendered- Returns:
- true if successful, false otherwise. If false, see Velocity runtime log
- Throws:
ParseErrorException
- The template could not be parsed.MethodInvocationException
- A method on a context object could not be invoked.ResourceNotFoundException
- A referenced resource could not be loaded.- Since:
- Velocity 1.6
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invokeVelocimacro
boolean invokeVelocimacro(String vmName, String logTag, String[] params, Context context, Writer writer)
Invokes a currently registered Velocimacro with the params provided and places the rendered stream into the writer.
Note : currently only accepts args to the VM if they are in the context.- Parameters:
vmName
- name of Velocimacro to calllogTag
- string to be used for template name in case of error. if null, the vmName will be usedparams
- keys for args used to invoke Velocimacro, in java format rather than VTL (eg "foo" or "bar" rather than "$foo" or "$bar")context
- Context object containing data/objects used for rendering.writer
- Writer for output stream- Returns:
- true if Velocimacro exists and successfully invoked, false otherwise.
- Since:
- 1.6
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getTemplate
Template getTemplate(String name) throws ResourceNotFoundException, ParseErrorException
Returns aTemplate
from the resource manager. This method assumes that the character encoding of the template is set by theinput.encoding
property. The default is UTF-8.- Parameters:
name
- The file name of the desired template.- Returns:
- The template.
- Throws:
ResourceNotFoundException
- if template not found from any available source.ParseErrorException
- if template cannot be parsed due to syntax (or other) error.
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getTemplate
Template getTemplate(String name, String encoding) throws ResourceNotFoundException, ParseErrorException
Returns aTemplate
from the resource manager- Parameters:
name
- The name of the desired template.encoding
- Character encoding of the template- Returns:
- The template.
- Throws:
ResourceNotFoundException
- if template not found from any available source.ParseErrorException
- if template cannot be parsed due to syntax (or other) error.
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getContent
ContentResource getContent(String name) throws ResourceNotFoundException, ParseErrorException
Returns a static content resource from the resource manager. Uses the current value if INPUT_ENCODING as the character encoding.- Parameters:
name
- Name of content resource to get- Returns:
- parsed ContentResource object ready for use
- Throws:
ResourceNotFoundException
- if template not found from any available source.ParseErrorException
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getContent
ContentResource getContent(String name, String encoding) throws ResourceNotFoundException, ParseErrorException
Returns a static content resource from the resource manager.- Parameters:
name
- Name of content resource to getencoding
- Character encoding to use- Returns:
- parsed ContentResource object ready for use
- Throws:
ResourceNotFoundException
- if template not found from any available source.ParseErrorException
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getLoaderNameForResource
String getLoaderNameForResource(String resourceName)
Determines is a template exists, and returns name of the loader that provides it. This is a slightly less hokey way to support the Velocity.templateExists() utility method, which was broken when per-template encoding was introduced. We can revisit this.- Parameters:
resourceName
- Name of template or content resource- Returns:
- class name of loader than can provide it
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getString
String getString(String key, String defaultValue)
String property accessor method with default to hide the configuration implementation.- Parameters:
key
- property keydefaultValue
- default value to return if key not found in resource manager.- Returns:
- String value of key or default
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getVelocimacro
Directive getVelocimacro(String vmName, Template renderingTemplate, Template template)
Returns the appropriate VelocimacroProxy object if strVMname is a valid current Velocimacro.- Parameters:
vmName
- Name of velocimacro requestedrenderingTemplate
- Template we are currently rendering. This information is needed when VM_PERM_ALLOW_INLINE_REPLACE_GLOBAL setting is true and template contains a macro with the same name as the global macro library.template
- current template- Returns:
- VelocimacroProxy
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addVelocimacro
boolean addVelocimacro(String name, Node macro, List<Macro.MacroArg> macroArgs, Template definingTemplate)
Adds a new Velocimacro. Usually called by Macro only while parsing.- Parameters:
name
- Name of velocimacromacro
- root AST node of the parsed macromacroArgs
- Array of macro arguments, containing the #macro() arguments and default values. the 0th is the name.definingTemplate
- template containing macro definition- Returns:
- boolean True if added, false if rejected for some reason (either parameters or permission settings)
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isVelocimacro
boolean isVelocimacro(String vmName, Template template)
Checks to see if a VM exists- Parameters:
vmName
- Name of velocimacrotemplate
- Template "namespace"- Returns:
- boolean True if VM by that name exists, false if not
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getString
String getString(String key)
String property accessor method to hide the configuration implementation- Parameters:
key
- property key- Returns:
- value of key or null
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getInt
int getInt(String key)
Int property accessor method to hide the configuration implementation.- Parameters:
key
- property key- Returns:
- int value
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getInt
int getInt(String key, int defaultValue)
Int property accessor method to hide the configuration implementation.- Parameters:
key
- property keydefaultValue
- default value- Returns:
- int value
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getBoolean
boolean getBoolean(String key, boolean def)
Boolean property accessor method to hide the configuration implementation.- Parameters:
key
- property keydef
- default default value if property not found- Returns:
- boolean value of key or default value
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getConfiguration
ExtProperties getConfiguration()
Return the velocity runtime configuration object.- Returns:
- ExtProperties configuration object which houses the velocity runtime properties.
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getApplicationAttribute
Object getApplicationAttribute(Object key)
Return the specified application attribute.- Parameters:
key
- The name of the attribute to retrieve.- Returns:
- The value of the attribute.
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setApplicationAttribute
Object setApplicationAttribute(Object key, Object value)
Set the specified application attribute.- Parameters:
key
- The name of the attribute to set.value
- The attribute value to set.- Returns:
- the displaced attribute value
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getUberspect
Uberspect getUberspect()
Returns the configured class introspection/reflection implementation.- Returns:
- The current Uberspect object.
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getLog
org.slf4j.Logger getLog()
Returns the configured logger.- Returns:
- A Logger object.
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getLog
org.slf4j.Logger getLog(String childNamespace)
Get a logger for the specified child namespace. If a logger was configured using the runtime.log.instance configuration property, returns this instance. Otherwise, uses SLF4J LoggerFactory on baseNamespace + childNamespace.- Parameters:
childNamespace
-- Returns:
- child name space logger
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getLogContext
LogContext getLogContext()
Get the LogContext object used to tack locations in templates.- Returns:
- LogContext object
- Since:
- 2.2
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getApplicationEventCartridge
EventCartridge getApplicationEventCartridge()
Returns the event handlers for the application.- Returns:
- The event handlers for the application.
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isInitialized
boolean isInitialized()
Returns true if the RuntimeInstance has been successfully initialized.- Returns:
- True if the RuntimeInstance has been successfully initialized.
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createNewParser
Parser createNewParser()
Create a new parser instance.- Returns:
- A new parser instance.
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getDirective
Directive getDirective(String name)
Retrieve a previously instantiated directive.- Parameters:
name
- name of the directive- Returns:
- the directive with that name, if any
- Since:
- 1.6
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useStringInterning
boolean useStringInterning()
Check whether the engine uses string interning- Returns:
- true if string interning is active
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getSpaceGobbling
RuntimeConstants.SpaceGobbling getSpaceGobbling()
get space gobbling mode- Returns:
- space gobbling mode
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isHyphenAllowedInIdentifiers
boolean isHyphenAllowedInIdentifiers()
Get whether hyphens are allowed in identifiers- Returns:
- configured boolean flag
- Since:
- 2.1
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isScopeControlEnabled
boolean isScopeControlEnabled(String scopeName)
Get whether to provide a scope control object for this scope- Parameters:
scopeName
-- Returns:
- scope control enabled
- Since:
- 2.1
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getParserConfiguration
ParserConfiguration getParserConfiguration()
Get the replacement characters configured for this runtime service's parser- Returns:
- configured replacement characters
- Since:
- 2.2
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