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/jEdit/tags/jedit-4-5-pre1/org/gjt/sp/jedit/bsh/BSHType.java

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Java | 218 lines | 112 code | 24 blank | 82 comment | 37 complexity | f6e4b54bb1b0dcd54dcac66afcc67f86 MD5 | raw file
  1/*****************************************************************************
  2 *                                                                           *
  3 *  This file is part of the BeanShell Java Scripting distribution.          *
  4 *  Documentation and updates may be found at http://www.beanshell.org/      *
  5 *                                                                           *
  6 *  Sun Public License Notice:                                               *
  7 *                                                                           *
  8 *  The contents of this file are subject to the Sun Public License Version  *
  9 *  1.0 (the "License"); you may not use this file except in compliance with *
 10 *  the License. A copy of the License is available at http://www.sun.com    * 
 11 *                                                                           *
 12 *  The Original Code is BeanShell. The Initial Developer of the Original    *
 13 *  Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright     *
 14 *  (C) 2000.  All Rights Reserved.                                          *
 15 *                                                                           *
 16 *  GNU Public License Notice:                                               *
 17 *                                                                           *
 18 *  Alternatively, the contents of this file may be used under the terms of  *
 19 *  the GNU Lesser General Public License (the "LGPL"), in which case the    *
 20 *  provisions of LGPL are applicable instead of those above. If you wish to *
 21 *  allow use of your version of this file only under the  terms of the LGPL *
 22 *  and not to allow others to use your version of this file under the SPL,  *
 23 *  indicate your decision by deleting the provisions above and replace      *
 24 *  them with the notice and other provisions required by the LGPL.  If you  *
 25 *  do not delete the provisions above, a recipient may use your version of  *
 26 *  this file under either the SPL or the LGPL.                              *
 27 *                                                                           *
 28 *  Patrick Niemeyer (pat@pat.net)                                           *
 29 *  Author of Learning Java, O'Reilly & Associates                           *
 30 *  http://www.pat.net/~pat/                                                 *
 31 *                                                                           *
 32 *****************************************************************************/
 33
 34
 35package org.gjt.sp.jedit.bsh;
 36
 37import java.lang.reflect.Array;
 38
 39class BSHType extends SimpleNode 
 40	implements BshClassManager.Listener
 41{
 42	/**
 43		baseType is used during evaluation of full type and retained for the
 44		case where we are an array type.
 45		In the case where we are not an array this will be the same as type.
 46	*/
 47	private Class baseType;
 48	/** 
 49		If we are an array type this will be non zero and indicate the 
 50		dimensionality of the array.  e.g. 2 for String[][];
 51	*/
 52    private int arrayDims;
 53
 54	/** 
 55		Internal cache of the type.  Cleared on classloader change.
 56	*/
 57    private Class type;
 58
 59	String descriptor;
 60
 61    BSHType(int id) { 
 62		super(id); 
 63	}
 64
 65	/**
 66		Used by the grammar to indicate dimensions of array types 
 67		during parsing.
 68	*/
 69    public void addArrayDimension() { 
 70		arrayDims++; 
 71	}
 72
 73	SimpleNode getTypeNode() {
 74        return (SimpleNode)jjtGetChild(0);
 75	}
 76
 77    /**
 78		 Returns a class descriptor for this type.
 79		 If the type is an ambiguous name (object type) evaluation is 
 80		 attempted through the namespace in order to resolve imports.
 81		 If it is not found and the name is non-compound we assume the default
 82		 package for the name.
 83	*/
 84    public String getTypeDescriptor( 
 85		CallStack callstack, Interpreter interpreter, String defaultPackage ) 
 86    {
 87        // return cached type if available
 88		if ( descriptor != null )
 89			return descriptor;
 90
 91		String descriptor;
 92        //  first node will either be PrimitiveType or AmbiguousName
 93        SimpleNode node = getTypeNode();
 94        if ( node instanceof BSHPrimitiveType )
 95            descriptor = getTypeDescriptor( ((BSHPrimitiveType)node).type );
 96        else 
 97		{
 98            String clasName = ((BSHAmbiguousName)node).text;
 99			BshClassManager bcm = interpreter.getClassManager();
100			// Note: incorrect here - we are using the hack in bsh class
101			// manager that allows lookup by base name.  We need to eliminate
102			// this limitation by working through imports.  See notes in class
103			// manager.
104			String definingClass = bcm.getClassBeingDefined( clasName );
105
106            Class clas = null;
107			if ( definingClass == null )
108			{
109				try {
110					clas = ((BSHAmbiguousName)node).toClass( 
111						callstack, interpreter );
112				} catch ( EvalError e ) {
113					//throw new InterpreterError("unable to resolve type: "+e);
114					// ignore and try default package
115					//System.out.println("BSHType: "+node+" class not found");
116				}
117			} else
118				clasName = definingClass;
119
120			if ( clas != null )
121			{
122				//System.out.println("found clas: "+clas);
123            	descriptor = getTypeDescriptor( clas );
124			}else
125			{
126				if ( defaultPackage == null || Name.isCompound( clasName ) )
127            		descriptor = "L" + clasName.replace('.','/') + ";";
128				else
129            		descriptor = 
130						"L"+defaultPackage.replace('.','/')+"/"+clasName + ";";
131			}
132		}
133
134		for(int i=0; i<arrayDims; i++)
135			descriptor = "["+descriptor;
136
137		this.descriptor = descriptor;
138	//System.out.println("BSHType: returning descriptor: "+descriptor);
139        return descriptor;
140    }
141
142    public Class getType( CallStack callstack, Interpreter interpreter ) 
143		throws EvalError
144    {
145        // return cached type if available
146		if ( type != null )
147			return type;
148
149        //  first node will either be PrimitiveType or AmbiguousName
150        SimpleNode node = getTypeNode();
151        if ( node instanceof BSHPrimitiveType )
152            baseType = ((BSHPrimitiveType)node).getType();
153        else 
154            baseType = ((BSHAmbiguousName)node).toClass( 
155				callstack, interpreter );
156
157        if ( arrayDims > 0 ) {
158            try {
159                // Get the type by constructing a prototype array with
160				// arbitrary (zero) length in each dimension.
161                int[] dims = new int[arrayDims]; // int array default zeros
162                Object obj = Array.newInstance(baseType, dims);
163                type = obj.getClass(); 
164            } catch(Exception e) {
165                throw new EvalError("Couldn't construct array type", 
166					this, callstack );
167            }
168        } else
169            type = baseType;
170
171		// hack... sticking to first interpreter that resolves this
172		// see comments on type instance variable
173		interpreter.getClassManager().addListener(this);
174
175        return type;
176    }
177
178	/**
179		baseType is used during evaluation of full type and retained for the
180		case where we are an array type.
181		In the case where we are not an array this will be the same as type.
182	*/
183	public Class getBaseType() {
184		return baseType;
185	}
186	/** 
187		If we are an array type this will be non zero and indicate the 
188		dimensionality of the array.  e.g. 2 for String[][];
189	*/
190	public int getArrayDims() {
191		return arrayDims;
192	}
193
194	public void classLoaderChanged() {
195		type = null;
196		baseType = null;
197	}
198
199	public static String getTypeDescriptor( Class clas ) 
200	{
201		if ( clas == Boolean.TYPE ) return "Z";
202		if ( clas == Character.TYPE ) return "C"; 
203		if ( clas == Byte.TYPE ) return "B";
204		if ( clas == Short.TYPE ) return "S";
205		if ( clas == Integer.TYPE ) return "I";
206		if ( clas == Long.TYPE ) return "J";
207		if ( clas == Float.TYPE ) return "F";
208		if ( clas == Double.TYPE ) return "D";
209		if ( clas == Void.TYPE ) return "V";
210	// Is getName() ok?  test with 1.1
211		String name = clas.getName().replace('.','/');
212
213		if ( name.startsWith("[") || name.endsWith(";") )
214			return name;
215		else
216			return "L"+ name.replace('.','/') +";";
217	}
218}