VisClient/org/hfbk/util/Scripter.java

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package org.hfbk.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map.Entry;

import org.hfbk.vis.FileUtils;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.ContextFactory;
import org.mozilla.javascript.EcmaError;
import org.mozilla.javascript.EvaluatorException;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.ImporterTopLevel;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.Undefined;


public class Scripter {
        
        Scriptable scope;
        Context context;
        
        HashMap<String,Object> params=new HashMap<String, Object>();
        
        public Scripter() {
                context=ContextFactory.getGlobal().enterContext();
                scope=new ImporterTopLevel(context);
                Context.exit();
        }
        
        public void put(String name, Object object){
                params.put(name, object);
        }
        
        public Object evaluate(String script) throws EvaluatorException, EcmaError{

                context=ContextFactory.getGlobal().enterContext();
                
                for  (Entry<String, Object> p: params.entrySet())
                        ScriptableObject.putProperty(scope, p.getKey(), Context.javaToJS(p.getValue(), scope));
                
                Object result=context.evaluateString(scope, script, script, 0, null);
                if (result instanceof Undefined) return null;
                return Context.jsToJava(result, Object.class);
        }
        
        
        public ScriptFunction getFunction(String name){
                context=ContextFactory.getGlobal().enterContext();
                Object o=scope.get(name, scope);
                if (o instanceof Function)
                        return new ScriptFunction((Function)o);
                else
                        return null;
        }
        
        public class ScriptFunction{
                Function f;
                ScriptFunction(Function f){
                        this.f=f;                       
                };
                
                public Object call(Object... args){                                     
                        return f.call(context, scope, scope, args);             
                }       
        }
        
        public void source(String url){
                try {
                        BufferedReader r=new BufferedReader(new InputStreamReader(FileUtils.getStream(url)));
                        String script="", l;
                        while((l=r.readLine())!=null)
                                script+=l+"\n";
                        evaluate(script);
                } catch (IOException e) {
                        e.printStackTrace();
                }
                
        }
}

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