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## bsh
Class NameSpace

    java.lang.Object
      bsh.NameSpace

All Implemented Interfaces:
  BshClassManager.Listener, NameSource, java.io.Serializable

public class NameSpace
extends java.lang.Object
implements java.io.Serializable, BshClassManager.Listener, NameSource

A namespace in which methods, variables, and imports (class names) live. This is package public because it is used in the implementation of some bsh commands. However for normal use you should be using methods on bsh.Interpreter to interact with your scripts.

A bsh.This object is a thin layer over a NameSpace that associates it with an Interpreter instance. Together they comprise a Bsh scripted object context.

Note: I'd really like to use collections here, but we have to keep this compatible with JDK1.1

See Also:
  Serialized Form

Nested Class Summary

Nested classes inherited from class bsh.NameSource
`NameSource.Listener`

Field Summary
`protected java.util.Hashtable` | `importedClasses`
`static NameSpace` | `JAVACODE`

Constructor Summary
`NameSpace(BshClassManager classManager, java.lang.String name)`
`NameSpace(NameSpace parent, BshClassManager classManager, java.lang.String name)`
`NameSpace(NameSpace parent, java.lang.String name)`

Method Summary
`void` | `addCommandPath(java.lang.String path, java.lang.Class clas)` Adds a URL to the command path.
`void` | `addNameSourceListener(NameSource.Listener listener)` Implements NameSource Add a listener who is notified upon changes to names in this space.
`void` | `classLoaderChanged()` Clear all cached classes and names
`void` | `clear()` Clear all variables, methods, and imports from this namespace.
`void` | `doSuperImport()` Perform "import *;" causing the entire classpath to be mapped.
`java.lang.Object` | `get(java.lang.String name, Interpreter interpreter)` Resolve name to an object through this namespace.
`java.lang.String[]` | `getAllNames()` Implements NameSource
`protected void` | `getAllNamesAux(java.util.Vector vec)` Helper for implementing NameSource
`java.lang.Class` | `getClass(java.lang.String name)` Load a class through this namespace taking into account imports.
`BshClassManager` | `getClassManager()`
`java.io.InputStream` | `getCommand(java.lang.String name)` Looks up a command.
`java.lang.Object` | `getCommand(java.lang.String name, java.lang.Class[] argTypes, Interpreter interpreter)` A command is a scripted method or compiled command class implementing a specified method signature.
`Variable[]` | `getDeclaredVariables()`
`This` | `getGlobal(Interpreter declaringInterpreter)` Get the top level namespace or this namespace if we are the top.
`protected BshMethod` | `getImportedMethod(java.lang.String name, java.lang.Class[] sig)`
`protected Variable` | `getImportedVar(java.lang.String name)`
`int` | `getInvocationLine()`
`java.lang.String` | `getInvocationText()`
`BshMethod` | `getMethod(java.lang.String name, java.lang.Class[] sig)`
`BshMethod` | `getMethod(java.lang.String name, java.lang.Class[] sig, boolean declaredOnly)` Get the bsh method matching the specified signature declared in this name space or a parent.
`java.lang.String[]` | `getMethodNames()` Get the names of methods declared in this namespace.
`BshMethod[]` | `getMethods()` Get the methods defined in this namespace.
`java.lang.String` | `getName()` The name of this namespace.
`NameSpace` | `getParent()` Get the parent namespace.
`This` | `getSuper(Interpreter declaringInterpreter)` Get the parent namespace' This reference or this namespace' This reference if we are the top.
`java.lang.Object` | `getVariable(java.lang.String name)` Get the specified variable in this namespace or a parent namespace.
`java.lang.Object` | `getVariable(java.lang.String name, boolean recurse)` Get the specified variable in this namespace.
`protected Variable` | `getVariableImpl(java.lang.String name, boolean recurse)` Locate a variable and return the Variable object with optional recursion through parent name spaces.
`java.lang.String[]` | `getVariableNames()` Get the names of variables defined in this namespace.
`static java.lang.Class` | `identifierToClass(ClassIdentifier ci)` This is a helper method for working inside of bsh scripts and commands.
`void` | `importClass(java.lang.String name)` Import a class name.
`void` | `importObject(java.lang.Object obj)` Import a compiled Java object's methods and variables into this namespace.
`void` | `importPackage(java.lang.String name)` subsequent imports override earlier ones
`void` | `importStatic(java.lang.Class clas)`
`java.lang.Object` | `invokeMethod(java.lang.String methodName, java.lang.Object[] args, Interpreter interpreter)` Invoke a method in this namespace with the specified args and interpreter reference.
`java.lang.Object` | `invokeMethod(java.lang.String methodName, java.lang.Object[] args, Interpreter interpreter, CallStack callstack, bsh.SimpleNode callerInfo)` This method simply delegates to This.invokeMethod();
`void` | `loadDefaultImports()` Import standard packages.
`void` | `nameSpaceChanged()` Clear all cached classes and names
`void` | `prune()` Used for serialization
`void` | `removeCommandPath(java.lang.String path, java.lang.Class clas)` Remove a URLfrom the command path.
`void` | `setMethod(java.lang.String name, BshMethod method)` Note: this is primarily for internal use.
`void` | `setName(java.lang.String name)`
`void` | `setParent(NameSpace parent)`
`void` | `setTypedVariable(java.lang.String name, java.lang.Class type, java.lang.Object value, boolean isFinal)` Deprecated. See #setTypedVariable( String, Class, Object, Modifiers )
`void` | `setTypedVariable(java.lang.String name, java.lang.Class type, java.lang.Object value, Modifiers modifiers)` Declare a variable in the local scope and set its initial value.
`void` | `setVariable(java.lang.String name, java.lang.Object value)`
`void` | `setVariable(java.lang.String name, java.lang.Object value, boolean strictJava)` Set the variable through this namespace.
`java.lang.String` | `toString()`
`void` | `unsetVariable(java.lang.String name)` Remove the variable from the namespace.
`protected java.lang.Object` | `unwrapVariable(Variable var)` Unwrap a variable to its value.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### JAVACODE

    public static final NameSpace JAVACODE

### importedClasses

    protected java.util.Hashtable importedClasses

Constructor Detail

### NameSpace

    public NameSpace(NameSpace parent,
                     java.lang.String name)

### NameSpace

    public NameSpace(BshClassManager classManager,
                     java.lang.String name)

### NameSpace

    public NameSpace(NameSpace parent,
                     BshClassManager classManager,
                     java.lang.String name)

Method Detail

### setName

    public void setName(java.lang.String name)

### getName

    public java.lang.String getName()

  The name of this namespace. If the namespace is a method body namespace then this is the name of the method. If it's a class or class instance then it's the name of the class.

### get

    public java.lang.Object get(java.lang.String name,
                                Interpreter interpreter)
                         throws UtilEvalError

  Resolve name to an object through this namespace.

  Throws:
    `UtilEvalError`

### setVariable

    public void setVariable(java.lang.String name,
                            java.lang.Object value)
                     throws UtilEvalError

  Throws:
    `UtilEvalError`

### setVariable

    public void setVariable(java.lang.String name,
                            java.lang.Object value,
                            boolean strictJava)
                     throws UtilEvalError

  Set the variable through this namespace. This method obeys the LOCALSCOPING property to determine how variables are set.

  Note: this method is primarily intended for use internally. If you use this method outside of the bsh package and wish to set variables with primitive values you will have to wrap them using bsh.Primitive.

  Parameters:
    `strictJava` - specifies whether strict java rules are applied.
  Throws:
    `UtilEvalError`
  See Also:
    `

    Setting a new variable (which didn't exist before) or removing a variable causes a namespace change.

    `

### unsetVariable

    public void unsetVariable(java.lang.String name)

  Remove the variable from the namespace.

### getVariableNames

    public java.lang.String[] getVariableNames()

  Get the names of variables defined in this namespace. (This does not show variables in parent namespaces).

### getMethodNames

    public java.lang.String[] getMethodNames()

  Get the names of methods declared in this namespace. (This does not include methods in parent namespaces).

### getMethods

    public BshMethod[] getMethods()

  Get the methods defined in this namespace. (This does not show methods in parent namespaces). Note: This will probably be renamed getDeclaredMethods()

### getParent

    public NameSpace getParent()

  Get the parent namespace. Note: this isn't quite the same as getSuper(). getSuper() returns 'this' if we are at the root namespace.

### getSuper

    public This getSuper(Interpreter declaringInterpreter)

  Get the parent namespace' This reference or this namespace' This reference if we are the top.

### getGlobal

    public This getGlobal(Interpreter declaringInterpreter)

  Get the top level namespace or this namespace if we are the top. Note: this method should probably return type bsh.This to be consistent with getThis();

### getClassManager

    public BshClassManager getClassManager()

### prune

    public void prune()

  Used for serialization

### setParent

    public void setParent(NameSpace parent)

### getVariable

    public java.lang.Object getVariable(java.lang.String name)
                                 throws UtilEvalError

  Get the specified variable in this namespace or a parent namespace.

  Note: this method is primarily intended for use internally. If you use this method outside of the bsh package you will have to use Primitive.unwrap() to get primitive values.

  Returns:
    The variable value or Primitive.VOID if it is not defined.
  Throws:
    `UtilEvalError`
  See Also:
    `Primitive.unwrap( Object )`

### getVariable

    public java.lang.Object getVariable(java.lang.String name,
                                        boolean recurse)
                                 throws UtilEvalError

  Get the specified variable in this namespace.

  Parameters:
    `recurse` - If recurse is true then we recursively search through parent namespaces for the variable.

    Note: this method is primarily intended for use internally. If you use this method outside of the bsh package you will have to use Primitive.unwrap() to get primitive values.

  Returns:
    The variable value or Primitive.VOID if it is not defined.
  Throws:
    `UtilEvalError`
  See Also:
    `Primitive.unwrap( Object )`

### getVariableImpl

    protected Variable getVariableImpl(java.lang.String name,
                                       boolean recurse)
                                throws UtilEvalError

  Locate a variable and return the Variable object with optional recursion through parent name spaces.

  If this namespace is static, return only static variables.

  Returns:
    the Variable value or null if it is not defined
  Throws:
    `UtilEvalError`

### getDeclaredVariables

    public Variable[] getDeclaredVariables()

### unwrapVariable

    protected java.lang.Object unwrapVariable(Variable var)
                                       throws UtilEvalError

  Unwrap a variable to its value.

  Returns:
    return the variable value. A null var is mapped to Primitive.VOID
  Throws:
    `UtilEvalError`

### setTypedVariable

    public void setTypedVariable(java.lang.String name,
                                 java.lang.Class type,
                                 java.lang.Object value,
                                 boolean isFinal)
                          throws UtilEvalError

  Deprecated. See #setTypedVariable( String, Class, Object, Modifiers )

  Throws:
    `UtilEvalError`

### setTypedVariable

    public void setTypedVariable(java.lang.String name,
                                 java.lang.Class type,
                                 java.lang.Object value,
                                 Modifiers modifiers)
                          throws UtilEvalError

  Declare a variable in the local scope and set its initial value. Value may be null to indicate that we would like the default value for the variable type. (e.g. 0 for integer types, null for object types). An existing typed variable may only be set to the same type. If an untyped variable of the same name exists it will be overridden with the new typed var. The set will perform a Types.getAssignableForm() on the value if necessary.

  Note: this method is primarily intended for use internally. If you use this method outside of the bsh package and wish to set variables with primitive values you will have to wrap them using bsh.Primitive.

  Parameters:
    `value` - If value is null, you'll get the default value for the type
    `modifiers` - may be null
  Throws:
    `UtilEvalError`
  See Also:
    `Primitive`

### setMethod

    public void setMethod(java.lang.String name,
                          BshMethod method)
                   throws UtilEvalError

  Note: this is primarily for internal use.

  Throws:
    `UtilEvalError`
  See Also:
    `Interpreter.source( String )`, `Interpreter.eval( String )`

### getMethod

    public BshMethod getMethod(java.lang.String name,
                               java.lang.Class[] sig)
                        throws UtilEvalError

  Throws:
    `UtilEvalError`
  See Also:
    `getMethod( String, Class [], boolean )`, `getMethod( String, Class [] )`

### getMethod

    public BshMethod getMethod(java.lang.String name,
                               java.lang.Class[] sig,
                               boolean declaredOnly)
                        throws UtilEvalError

  Get the bsh method matching the specified signature declared in this name space or a parent.

  Note: this method is primarily intended for use internally. If you use this method outside of the bsh package you will have to be familiar with BeanShell's use of the Primitive wrapper class.

  Parameters:
    `declaredOnly` - if true then only methods declared directly in this namespace will be found and no inherited or imported methods will be visible.
  Returns:
    the BshMethod or null if not found
  Throws:
    `UtilEvalError`
  See Also:
    `Primitive`

### importClass

    public void importClass(java.lang.String name)

  Import a class name. Subsequent imports override earlier ones

### importPackage

    public void importPackage(java.lang.String name)

  subsequent imports override earlier ones

### addCommandPath

    public void addCommandPath(java.lang.String path,
                               java.lang.Class clas)

  Adds a URL to the command path.

### removeCommandPath

    public void removeCommandPath(java.lang.String path,
                                  java.lang.Class clas)

  Remove a URLfrom the command path.

### getCommand

    public java.io.InputStream getCommand(java.lang.String name)

  Looks up a command.

### getCommand

    public java.lang.Object getCommand(java.lang.String name,
                                       java.lang.Class[] argTypes,
                                       Interpreter interpreter)
                                throws UtilEvalError

  A command is a scripted method or compiled command class implementing a specified method signature. Commands are loaded from the classpath and may be imported using the importCommands() method.

  This method searches the imported commands packages for a script or command object corresponding to the name of the method. If it is a script the script is sourced into this namespace and the BshMethod for the requested signature is returned. If it is a compiled class the class is returned. (Compiled command classes implement static invoke() methods).

  The imported packages are searched in reverse order, so that later imports take priority. Currently only the first object (script or class) with the appropriate name is checked. If another, overloaded form, is located in another package it will not currently be found. This could be fixed.

  Parameters:
    `name` - is the name of the desired command method
    `argTypes` - is the signature of the desired command method.
  Returns:
    a BshMethod, Class, or null if no such command is found.
  Throws:
    `UtilEvalError` - if loadScriptedCommand throws UtilEvalError i.e. on errors loading a script that was found

### getImportedMethod

    protected BshMethod getImportedMethod(java.lang.String name,
                                          java.lang.Class[] sig)
                                   throws UtilEvalError

  Throws:
    `UtilEvalError`

### getImportedVar

    protected Variable getImportedVar(java.lang.String name)
                               throws UtilEvalError

  Throws:
    `UtilEvalError`

### getClass

    public java.lang.Class getClass(java.lang.String name)
                             throws UtilEvalError

  Load a class through this namespace taking into account imports. The class search will proceed through the parent namespaces if necessary.

  Returns:
    null if not found.
  Throws:
    `UtilEvalError`

### getAllNames

    public java.lang.String[] getAllNames()

  Implements NameSource

  Specified by:
    `getAllNames` in interface `NameSource`
  Returns:
    all variable and method names in this and all parent namespaces

### getAllNamesAux

    protected void getAllNamesAux(java.util.Vector vec)

  Helper for implementing NameSource

### addNameSourceListener

    public void addNameSourceListener(NameSource.Listener listener)

  Implements NameSource Add a listener who is notified upon changes to names in this space.

  Specified by:
    `addNameSourceListener` in interface `NameSource`

### doSuperImport

    public void doSuperImport()
                       throws UtilEvalError

  Perform "import *;" causing the entire classpath to be mapped. This can take a while.

  Throws:
    `UtilEvalError`

### toString

    public java.lang.String toString()

### invokeMethod

    public java.lang.Object invokeMethod(java.lang.String methodName,
                                         java.lang.Object[] args,
                                         Interpreter interpreter)
                                  throws EvalError

  Invoke a method in this namespace with the specified args and interpreter reference. No caller information or call stack is required. The method will appear as if called externally from Java.

  Throws:
    `EvalError`
  See Also:
    `bsh.This.invokeMethod( String methodName, Object [] args, Interpreter interpreter, CallStack callstack, SimpleNode callerInfo, boolean )`

### invokeMethod

    public java.lang.Object invokeMethod(java.lang.String methodName,
                                         java.lang.Object[] args,
                                         Interpreter interpreter,
                                         CallStack callstack,
                                         bsh.SimpleNode callerInfo)
                                  throws EvalError

  This method simply delegates to This.invokeMethod();

  Throws:
    `EvalError`
  See Also:
    `bsh.This.invokeMethod( String methodName, Object [] args, Interpreter interpreter, CallStack callstack, SimpleNode callerInfo )`

### classLoaderChanged

    public void classLoaderChanged()

  Clear all cached classes and names

  Specified by:
    `classLoaderChanged` in interface `BshClassManager.Listener`

### nameSpaceChanged

    public void nameSpaceChanged()

  Clear all cached classes and names

### loadDefaultImports

    public void loadDefaultImports()

  Import standard packages. Currently:

                              importClass("bsh.EvalError");
                              importClass("bsh.Interpreter");
                              importPackage("javax.swing.event");
                              importPackage("javax.swing");
                              importPackage("java.awt.event");
                              importPackage("java.awt");
                              importPackage("java.net");
                              importPackage("java.util");
                              importPackage("java.io");
                              importPackage("java.lang");
                              addCommandPath("/bsh/commands",getClass());

### getInvocationLine

    public int getInvocationLine()

### getInvocationText

    public java.lang.String getInvocationText()

### identifierToClass

    public static java.lang.Class identifierToClass(ClassIdentifier ci)

  This is a helper method for working inside of bsh scripts and commands. In that context it is impossible to see a ClassIdentifier object for what it is. Attempting to access a method on a ClassIdentifier will look like a static method invocation. This method is in NameSpace for convenience (you don't have to import bsh.ClassIdentifier to use it );

### clear

    public void clear()

  Clear all variables, methods, and imports from this namespace. If this namespace is the root, it will be reset to the default imports.

  See Also:
    `loadDefaultImports()`

### importObject

    public void importObject(java.lang.Object obj)

  Import a compiled Java object's methods and variables into this namespace. When no scripted method / command or variable is found locally in this namespace method / fields of the object will be checked. Objects are checked in the order of import with later imports taking precedence.

### importStatic

    public void importStatic(java.lang.Class clas)

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