org.scijava.script

Class ScriptInfo

java.lang.Object

org.scijava.AbstractBasicDetails

org.scijava.AbstractUIDetails

org.scijava.module.AbstractModuleInfo

org.scijava.script.ScriptInfo

All Implemented Interfaces:

Comparable<Prioritized>, BasicDetails, Contextual, Identifiable, Locatable, ModuleInfo, Named, Prioritized, UIDetails, Validated, Versioned

public class ScriptInfo
extends AbstractModuleInfo
implements Contextual

Metadata about a script.

This class is responsible for parsing the script for parameters. See parseParameters() for details.

Author:

Curtis Rueden, Johannes Schindelin

Field Summary

Fields inherited from interface org.scijava.UIDetails

APPLICATION_MENU_ROOT

Constructor Summary

Constructors

Constructor and Description
ScriptInfo(Context context, File file) Creates a script metadata object which describes the given script file.
ScriptInfo(Context context, String path) Creates a script metadata object which describes the given script file.
ScriptInfo(Context context, String path, Reader reader) Creates a script metadata object which describes a script provided by the given Reader.

Method Summary

Modifier and Type	Method and Description
Context	context() Gets the application context to which the object belongs.
ScriptModule	createModule() Instantiates the module described by this module info.
Context	getContext() Gets the application context to which the object belongs, or null if Contextual.setContext(Context) has not yet been called on this object.
String	getDelegateClassName() Gets the fully qualified name of the class containing the module's actual implementation.
String	getIdentifier() Gets a string intended to function as an identifier for the object.
String	getLocation() Gets the URL string defining the object's location.
String	getPath() Gets the path to the script on disk.
BufferedReader	getReader() Gets a reader which delivers the script's content.
String	getVersion() Gets the version of the object.
boolean	isReturnValueDeclared() Gets whether the return value is explicitly declared as an output.
Class<?>	loadDelegateClass() Loads the class containing the module's actual implementation.
void	parseParameters() Parses the script's input and output parameters from the script header.
void	setContext(Context context) Sets the application context to which the object belongs.

Methods inherited from class org.scijava.module.AbstractModuleInfo

canCancel, canPreview, canRunHeadless, clearParameters, getInitializer, getInput, getInput, getOutput, getOutput, getProblems, getTitle, inputList, inputMap, inputs, isInteractive, isValid, outputList, outputMap, outputs, registerInput, registerOutput, update

Methods inherited from class org.scijava.AbstractUIDetails

compareTo, getIconPath, getMenuPath, getMenuRoot, getPriority, getSelectionGroup, isEnabled, isSelectable, isSelected, isVisible, setEnabled, setIconPath, setMenuPath, setMenuRoot, setPriority, setSelectable, setSelected, setSelectionGroup, setVisible, toString

Methods inherited from class org.scijava.AbstractBasicDetails

get, getDescription, getLabel, getName, is, set, setDescription, setLabel, setName

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.scijava.UIDetails

getIconPath, getMenuPath, getMenuRoot, getSelectionGroup, isEnabled, isSelectable, isSelected, isVisible, setEnabled, setIconPath, setMenuPath, setMenuRoot, setSelectable, setSelected, setSelectionGroup, setVisible

Methods inherited from interface org.scijava.BasicDetails

get, getDescription, getLabel, is, set, setDescription, setLabel

Methods inherited from interface org.scijava.Named

getName, setName

Methods inherited from interface org.scijava.Prioritized

getPriority, setPriority

Methods inherited from interface java.lang.Comparable

compareTo

Constructor Detail

ScriptInfo

public ScriptInfo(Context context,
                  File file)

Creates a script metadata object which describes the given script file.

Parameters:

context - The SciJava application context to use when populating service inputs.

file - The script file.

ScriptInfo

public ScriptInfo(Context context,
                  String path)

Creates a script metadata object which describes the given script file.

Parameters:

context - The SciJava application context to use when populating service inputs.

path - Path to the script file.

ScriptInfo

public ScriptInfo(Context context,
                  String path,
                  Reader reader)

Creates a script metadata object which describes a script provided by the given Reader.

Parameters:

context - The SciJava application context to use when populating service inputs.

path - Pseudo-path to the script file. This file does not actually need to exist, but rather provides a name for the script with file extension.

reader - Reader which provides the script itself (i.e., its contents).

Method Detail

getPath

public String getPath()

Gets the path to the script on disk.

If the path doesn't actually exist on disk, then this is a pseudo-path merely for the purpose of naming the script with a file extension, and the actual script content is delivered by the BufferedReader given by getReader().

getReader

public BufferedReader getReader()

Gets a reader which delivers the script's content.

This might be null, in which case the content is stored in a file on disk given by getPath().

parseParameters

public void parseParameters()

Parses the script's input and output parameters from the script header.

This method is called automatically the first time any parameter accessor method is called (AbstractModuleInfo.getInput(java.lang.String), AbstractModuleInfo.getOutput(java.lang.String), AbstractModuleInfo.inputs(), AbstractModuleInfo.outputs(), etc.). Subsequent calls will reparse the parameters.

SciJava's scripting framework supports specifying @Parameter-style inputs and outputs in a preamble. The format is a simplified version of the Java @Parameter annotation syntax. The following syntaxes are supported:

• // @<type> <varName>
• // @<type>(<attr1>=<value1>, ..., <attrN>=<valueN>) <varName>
• // @<IOType> <type> <varName>
• // @<IOType>(<attr1>=<value1>, ..., <attrN>=<valueN>) <type> <varName>

Where:

• // = the comment style of the scripting language, so that the parameter line is ignored by the script engine itself.
• <IOType> = one of INPUT, OUTPUT, or BOTH.
• <varName> = the name of the input or output variable.
• <type> = the Java Class of the variable.
• <attr*> = an attribute key.
• <value*> = an attribute value.

See the @Parameter annotation for a list of valid attributes.

Here are a few examples:

• // @Dataset dataset
• // @double(type=OUTPUT) result
• // @BOTH ImageDisplay display
• // @INPUT(persist=false, visibility=INVISIBLE) boolean verbose
parameters will be parsed and filled just like @Parameter -annotated fields in Commands.

Overrides:

parseParameters in class AbstractModuleInfo

isReturnValueDeclared

public boolean isReturnValueDeclared()

Gets whether the return value is explicitly declared as an output.

getDelegateClassName

public String getDelegateClassName()

Description copied from interface: ModuleInfo

Gets the fully qualified name of the class containing the module's actual implementation. By definition, this is the same value returned by createModule().getDelegateObject().getClass().getName(), and hence is also the class containing any callback methods specified by ModuleItem.getCallback().

The nature of this method is implementation-specific; for example, a CommandModule will return the class name of its associated Command. For modules that are not commands, the result may be something else.

If you are implementing this interface directly, a good rule of thumb is to return the class name of the associated Module (i.e., the same value given by createModule().getClass().getName()).

Specified by:

getDelegateClassName in interface ModuleInfo

loadDelegateClass

public Class<?> loadDelegateClass()

Description copied from interface: ModuleInfo

Loads the class containing the module's actual implementation. The name of the loaded class will match the value returned by ModuleInfo.getDelegateClassName().

Specified by:

loadDelegateClass in interface ModuleInfo

See Also:

Instantiable.loadClass()

createModule

public ScriptModule createModule()
                          throws ModuleException

Description copied from interface: ModuleInfo

Instantiates the module described by this module info.

Specified by:

createModule in interface ModuleInfo

Throws:

ModuleException

context

public Context context()

Description copied from interface: Contextual

Gets the application context to which the object belongs.

Specified by:

context in interface Contextual

See Also:

Contextual.getContext()

getContext

public Context getContext()

Description copied from interface: Contextual

Gets the application context to which the object belongs, or null if Contextual.setContext(Context) has not yet been called on this object.

Specified by:

getContext in interface Contextual

See Also:

Contextual.context()

setContext

public void setContext(Context context)

Description copied from interface: Contextual

Sets the application context to which the object belongs.

Typically this method simply delegates to Context.inject(Object), and should be called only once to populate the context. Most contextual objects do not support later alteration of the context, and will throw IllegalStateException if this method is invoked again.

Specified by:

setContext in interface Contextual

See Also:

Context.inject(Object), for an example of how to implement this interface

getIdentifier

public String getIdentifier()

Description copied from interface: Identifiable

Gets a string intended to function as an identifier for the object.

Specified by:

getIdentifier in interface Identifiable

Overrides:

getIdentifier in class AbstractModuleInfo

getLocation

public String getLocation()

Description copied from interface: Locatable

Gets the URL string defining the object's location.

Specified by:

getLocation in interface Locatable

Overrides:

getLocation in class AbstractModuleInfo

getVersion

public String getVersion()

Description copied from interface: Versioned

Gets the version of the object.

Specified by:

getVersion in interface Versioned

Overrides:

getVersion in class AbstractModuleInfo