JScript Code

package jscript.expression;

import java.util.*;
import jscript.engine.*;
import jscript.exception.*;
import jscript.statement.*;
import jscript.util.*;

public class JScriptMethod {
	public static final int NONE = 0;
	public static final int PRIVATE = 1;
	public static final int PROTECTED = 2;
	public static final int PUBLIC = 3;

	protected class Parameter {
		public boolean isFinal;
        public Class type;
		public String name;
		
		public Parameter(boolean isFinal, Class type, String name) {
			this.isFinal = isFinal;
			this.type = type;
			this.name = name;
		}
		
		public String toString() {
		    return type + " " + name;
		}
	}

	protected int privacy;
	protected boolean isStatic;
	protected boolean isAbstract;
	protected boolean isFinal;
	protected boolean isNative;
	protected boolean isSynchronized;
	protected Class type;
	protected String name;
	protected List throwList;
	protected Statement body;
	protected List paramList;
	protected Class[] paramType;
	
	public JScriptMethod() {
		privacy = NONE;
		isStatic = false;
		isAbstract = false;
		isFinal = false;
		isNative = false;
		isSynchronized = false;
		paramList = new ArrayList();
		throwList = null;
		type = null;
		name = null;
		body = null;
		paramType = null;
	}

	public void setPrivacy(int privacy) {
		if (this.privacy == privacy)
			throw new ParsingException("Duplicate modifier for the method");
		if (this.privacy != NONE)
			throw new ParsingException("The method can only set one of public / protected / private");
		this.privacy = privacy;
	}
	
	public void setStatic(boolean isStatic) {
		if (this.isStatic == isStatic)
			throw new ParsingException("Duplicate modifier for the method");
		this.isStatic = isStatic;
	}
	
	public void setAbstract(boolean isAbstract) {
		throw new ParsingException("The abstract method can only be defined by an abstract class");
	}
	
	public void setFinal(boolean isFinal) {
		if (this.isFinal == isFinal)
			throw new ParsingException("Duplicate modifier for the method");
		this.isFinal = isFinal;
	}
	
	public void setNative(boolean isNative) {
		throw new ParsingException("The native method is not supported by jscript yet");
	}
	
	public void setSynchronized(boolean isSynchronized) {
		if (this.isSynchronized == isSynchronized)
			throw new ParsingException("Duplicate modifier for the method");
		this.isSynchronized = isSynchronized;
	}
	
	public String getName() {
		return name;
	}
	
	public void setName(String name) {
		this.name = name;
	}
	
	public void setType(Class type) {
		this.type = type;
	}
	
	public void addParameter(boolean isFinal, Class type, String name) {
		paramList.add(new Parameter(isFinal, type, name));
	}
	
	public Class[] getParameterTypes() {
		if (paramType != null) return paramType;
		
		paramType = new Class[paramList.size()];
		int i = 0;
		for (Iterator it = paramList.iterator(); it.hasNext(); i++) {
			Parameter p = (Parameter)it.next();
			paramType[i] = p.type;
		}
		return paramType;
	}
	
	public List getParamList() {
		return paramList;
	}
	
	public void setThrowList(List throwList) {
		this.throwList = throwList;
	}
	
	public void setBody(Statement body) {
		this.body = body;
	}
	
	public Object invoke(EvaluatingContext ctx, Object[] args) {
		ctx.call();
		try {
			int i = 0;
			for (Iterator it = paramList.iterator(); it.hasNext(); i++)  {
				Parameter p = (Parameter)it.next();
				Class c = args[i] == null ? null : args[i].getClass();
				if (c != null && p.type.isPrimitive()) {
				    c = (Class)PrimitiveType.primitiveClassMap.get(c);
				    if (c == null) c = args[i].getClass();
				}
				ctx.defineVariable(p.name, p.type, p.isFinal, null).setValue(args[i], c, ctx);
			}
			try {
				body.execute(ctx);
				return ctx.popReturnValue();
			}catch(RuntimeException e) {
				throw e;
			}catch(Exception e) {
				throw new InvokationException("Exception on invokation", e);
			}
		} finally {
			ctx.ret();
		}
	}

	public Class getReturnType() {
		return type;
	}
	
	public String toString() {
	    StringBuffer sb = new StringBuffer();
        if (privacy == JScriptMethod.PUBLIC) sb.append("public ");
        if (privacy == JScriptMethod.PROTECTED) sb.append("protected ");
        if (privacy == JScriptMethod.PRIVATE) sb.append("private ");
        if (isStatic) sb.append("static ");
        if (isAbstract) sb.append("abstract ");
        if (isFinal) sb.append("final ");
        if (isNative) sb.append("native ");
        if (isSynchronized) sb.append("synchronized ");
        sb.append(type + " ");
        sb.append(name + "(");
        int i = 0;
        for (Iterator it = paramList.iterator(); it.hasNext();) {
            if (i++ > 0) sb.append(",");
            sb.append(it.next());
        }
        sb.append(")");
        if (throwList != null && !throwList.isEmpty()) {
            sb.append(" throws ");
            i = 0;
            for (Iterator it = throwList.iterator(); it.hasNext();) {
                if (i++ > 0) sb.append(",");
                sb.append(it.next());
            }
        }
	    return sb.toString();
	}
}