Source Code Cross Referenced for CallStack.java in  » Scripting » beanshell » bsh » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » beanshell » bsh 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*****************************************************************************
002:         *                                                                           *
003:         *  This file is part of the BeanShell Java Scripting distribution.          *
004:         *  Documentation and updates may be found at http://www.beanshell.org/      *
005:         *                                                                           *
006:         *  Sun Public License Notice:                                               *
007:         *                                                                           *
008:         *  The contents of this file are subject to the Sun Public License Version  *
009:         *  1.0 (the "License"); you may not use this file except in compliance with *
010:         *  the License. A copy of the License is available at http://www.sun.com    * 
011:         *                                                                           *
012:         *  The Original Code is BeanShell. The Initial Developer of the Original    *
013:         *  Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright     *
014:         *  (C) 2000.  All Rights Reserved.                                          *
015:         *                                                                           *
016:         *  GNU Public License Notice:                                               *
017:         *                                                                           *
018:         *  Alternatively, the contents of this file may be used under the terms of  *
019:         *  the GNU Lesser General Public License (the "LGPL"), in which case the    *
020:         *  provisions of LGPL are applicable instead of those above. If you wish to *
021:         *  allow use of your version of this file only under the  terms of the LGPL *
022:         *  and not to allow others to use your version of this file under the SPL,  *
023:         *  indicate your decision by deleting the provisions above and replace      *
024:         *  them with the notice and other provisions required by the LGPL.  If you  *
025:         *  do not delete the provisions above, a recipient may use your version of  *
026:         *  this file under either the SPL or the LGPL.                              *
027:         *                                                                           *
028:         *  Patrick Niemeyer (pat@pat.net)                                           *
029:         *  Author of Learning Java, O'Reilly & Associates                           *
030:         *  http://www.pat.net/~pat/                                                 *
031:         *                                                                           *
032:         *****************************************************************************/package bsh;
033:
034:        import java.util.Vector;
035:
036:        /**
037:         A stack of NameSpaces representing the call path.
038:         Each method invocation, for example, pushes a new NameSpace onto the stack.
039:         The top of the stack is always the current namespace of evaluation.
040:         <p>
041:
042:         This is used to support the this.caller magic reference and to print
043:         script "stack traces" when evaluation errors occur.
044:         <p>
045:
046:         Note: it would be awefully nice to use the java.util.Stack here.
047:         Sigh... have to stay 1.1 compatible.
048:         <p>
049:
050:         Note: How can this be thread safe, you might ask?  Wouldn't a thread 
051:         executing various beanshell methods be mutating the callstack?  Don't we 
052:         need one CallStack per Thread in the interpreter?  The answer is that we do.
053:         Any java.lang.Thread enters our script via an external (hard) Java 
054:         reference via a This type interface, e.g.  the Runnable interface 
055:         implemented by This or an arbitrary interface implemented by XThis.  
056:         In that case the This invokeMethod() method (called by any interface that 
057:         it exposes) creates a new CallStack for each external call.
058:         <p>
059:         */
060:        public class CallStack {
061:            private Vector stack = new Vector(2);
062:
063:            public CallStack() {
064:            }
065:
066:            public CallStack(NameSpace namespace) {
067:                push(namespace);
068:            }
069:
070:            public void clear() {
071:                stack.removeAllElements();
072:            }
073:
074:            public void push(NameSpace ns) {
075:                stack.insertElementAt(ns, 0);
076:            }
077:
078:            public NameSpace top() {
079:                return get(0);
080:            }
081:
082:            /**
083:            	zero based.
084:             */
085:            public NameSpace get(int depth) {
086:                if (depth >= depth())
087:                    return NameSpace.JAVACODE;
088:                else
089:                    return (NameSpace) (stack.elementAt(depth));
090:            }
091:
092:            /**
093:            	This is kind of crazy, but used by the setNameSpace command.
094:            	zero based.
095:             */
096:            public void set(int depth, NameSpace ns) {
097:                stack.setElementAt(ns, depth);
098:            }
099:
100:            public NameSpace pop() {
101:                if (depth() < 1)
102:                    throw new InterpreterError("pop on empty CallStack");
103:                NameSpace top = top();
104:                stack.removeElementAt(0);
105:                return top;
106:            }
107:
108:            /**
109:            	Swap in the value as the new top of the stack and return the old
110:            	value.
111:             */
112:            public NameSpace swap(NameSpace newTop) {
113:                NameSpace oldTop = (NameSpace) (stack.elementAt(0));
114:                stack.setElementAt(newTop, 0);
115:                return oldTop;
116:            }
117:
118:            public int depth() {
119:                return stack.size();
120:            }
121:
122:            public NameSpace[] toArray() {
123:                NameSpace[] nsa = new NameSpace[depth()];
124:                stack.copyInto(nsa);
125:                return nsa;
126:            }
127:
128:            public String toString() {
129:                StringBuffer sb = new StringBuffer();
130:                sb.append("CallStack:\n");
131:                NameSpace[] nsa = toArray();
132:                for (int i = 0; i < nsa.length; i++)
133:                    sb.append("\t" + nsa[i] + "\n");
134:
135:                return sb.toString();
136:            }
137:
138:            /**
139:            	Occasionally we need to freeze the callstack for error reporting
140:            	purposes, etc.
141:             */
142:            public CallStack copy() {
143:                CallStack cs = new CallStack();
144:                cs.stack = (Vector) this.stack.clone();
145:                return cs;
146:            }
147:        }
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