/jEdit/tags/jedit-4-5-pre1/org/gjt/sp/jedit/bsh/BSHType.java
Java | 218 lines | 112 code | 24 blank | 82 comment | 37 complexity | f6e4b54bb1b0dcd54dcac66afcc67f86 MD5 | raw file
Possible License(s): BSD-3-Clause, AGPL-1.0, Apache-2.0, LGPL-2.0, LGPL-3.0, GPL-2.0, CC-BY-SA-3.0, LGPL-2.1, GPL-3.0, MPL-2.0-no-copyleft-exception, IPL-1.0
- /*****************************************************************************
- * *
- * This file is part of the BeanShell Java Scripting distribution. *
- * Documentation and updates may be found at http://www.beanshell.org/ *
- * *
- * Sun Public License Notice: *
- * *
- * The contents of this file are subject to the Sun Public License Version *
- * 1.0 (the "License"); you may not use this file except in compliance with *
- * the License. A copy of the License is available at http://www.sun.com *
- * *
- * The Original Code is BeanShell. The Initial Developer of the Original *
- * Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright *
- * (C) 2000. All Rights Reserved. *
- * *
- * GNU Public License Notice: *
- * *
- * Alternatively, the contents of this file may be used under the terms of *
- * the GNU Lesser General Public License (the "LGPL"), in which case the *
- * provisions of LGPL are applicable instead of those above. If you wish to *
- * allow use of your version of this file only under the terms of the LGPL *
- * and not to allow others to use your version of this file under the SPL, *
- * indicate your decision by deleting the provisions above and replace *
- * them with the notice and other provisions required by the LGPL. If you *
- * do not delete the provisions above, a recipient may use your version of *
- * this file under either the SPL or the LGPL. *
- * *
- * Patrick Niemeyer (pat@pat.net) *
- * Author of Learning Java, O'Reilly & Associates *
- * http://www.pat.net/~pat/ *
- * *
- *****************************************************************************/
- package org.gjt.sp.jedit.bsh;
- import java.lang.reflect.Array;
- class BSHType extends SimpleNode
- implements BshClassManager.Listener
- {
- /**
- baseType is used during evaluation of full type and retained for the
- case where we are an array type.
- In the case where we are not an array this will be the same as type.
- */
- private Class baseType;
- /**
- If we are an array type this will be non zero and indicate the
- dimensionality of the array. e.g. 2 for String[][];
- */
- private int arrayDims;
- /**
- Internal cache of the type. Cleared on classloader change.
- */
- private Class type;
- String descriptor;
- BSHType(int id) {
- super(id);
- }
- /**
- Used by the grammar to indicate dimensions of array types
- during parsing.
- */
- public void addArrayDimension() {
- arrayDims++;
- }
- SimpleNode getTypeNode() {
- return (SimpleNode)jjtGetChild(0);
- }
- /**
- Returns a class descriptor for this type.
- If the type is an ambiguous name (object type) evaluation is
- attempted through the namespace in order to resolve imports.
- If it is not found and the name is non-compound we assume the default
- package for the name.
- */
- public String getTypeDescriptor(
- CallStack callstack, Interpreter interpreter, String defaultPackage )
- {
- // return cached type if available
- if ( descriptor != null )
- return descriptor;
- String descriptor;
- // first node will either be PrimitiveType or AmbiguousName
- SimpleNode node = getTypeNode();
- if ( node instanceof BSHPrimitiveType )
- descriptor = getTypeDescriptor( ((BSHPrimitiveType)node).type );
- else
- {
- String clasName = ((BSHAmbiguousName)node).text;
- BshClassManager bcm = interpreter.getClassManager();
- // Note: incorrect here - we are using the hack in bsh class
- // manager that allows lookup by base name. We need to eliminate
- // this limitation by working through imports. See notes in class
- // manager.
- String definingClass = bcm.getClassBeingDefined( clasName );
- Class clas = null;
- if ( definingClass == null )
- {
- try {
- clas = ((BSHAmbiguousName)node).toClass(
- callstack, interpreter );
- } catch ( EvalError e ) {
- //throw new InterpreterError("unable to resolve type: "+e);
- // ignore and try default package
- //System.out.println("BSHType: "+node+" class not found");
- }
- } else
- clasName = definingClass;
- if ( clas != null )
- {
- //System.out.println("found clas: "+clas);
- descriptor = getTypeDescriptor( clas );
- }else
- {
- if ( defaultPackage == null || Name.isCompound( clasName ) )
- descriptor = "L" + clasName.replace('.','/') + ";";
- else
- descriptor =
- "L"+defaultPackage.replace('.','/')+"/"+clasName + ";";
- }
- }
- for(int i=0; i<arrayDims; i++)
- descriptor = "["+descriptor;
- this.descriptor = descriptor;
- //System.out.println("BSHType: returning descriptor: "+descriptor);
- return descriptor;
- }
- public Class getType( CallStack callstack, Interpreter interpreter )
- throws EvalError
- {
- // return cached type if available
- if ( type != null )
- return type;
- // first node will either be PrimitiveType or AmbiguousName
- SimpleNode node = getTypeNode();
- if ( node instanceof BSHPrimitiveType )
- baseType = ((BSHPrimitiveType)node).getType();
- else
- baseType = ((BSHAmbiguousName)node).toClass(
- callstack, interpreter );
- if ( arrayDims > 0 ) {
- try {
- // Get the type by constructing a prototype array with
- // arbitrary (zero) length in each dimension.
- int[] dims = new int[arrayDims]; // int array default zeros
- Object obj = Array.newInstance(baseType, dims);
- type = obj.getClass();
- } catch(Exception e) {
- throw new EvalError("Couldn't construct array type",
- this, callstack );
- }
- } else
- type = baseType;
- // hack... sticking to first interpreter that resolves this
- // see comments on type instance variable
- interpreter.getClassManager().addListener(this);
- return type;
- }
- /**
- baseType is used during evaluation of full type and retained for the
- case where we are an array type.
- In the case where we are not an array this will be the same as type.
- */
- public Class getBaseType() {
- return baseType;
- }
- /**
- If we are an array type this will be non zero and indicate the
- dimensionality of the array. e.g. 2 for String[][];
- */
- public int getArrayDims() {
- return arrayDims;
- }
- public void classLoaderChanged() {
- type = null;
- baseType = null;
- }
- public static String getTypeDescriptor( Class clas )
- {
- if ( clas == Boolean.TYPE ) return "Z";
- if ( clas == Character.TYPE ) return "C";
- if ( clas == Byte.TYPE ) return "B";
- if ( clas == Short.TYPE ) return "S";
- if ( clas == Integer.TYPE ) return "I";
- if ( clas == Long.TYPE ) return "J";
- if ( clas == Float.TYPE ) return "F";
- if ( clas == Double.TYPE ) return "D";
- if ( clas == Void.TYPE ) return "V";
- // Is getName() ok? test with 1.1
- String name = clas.getName().replace('.','/');
- if ( name.startsWith("[") || name.endsWith(";") )
- return name;
- else
- return "L"+ name.replace('.','/') +";";
- }
- }