Implementing a Script Engine - Scripting in Java: Integrating with Groovy and JavaScript - page 265

Listing 8-2. An Implementation of JKScript Script Engine
// JKScriptEngine.java
package com.jdojo.script;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import javax.script.AbstractScriptEngine;
import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptException;
import javax.script.SimpleBindings;
public class JKScriptEngine extends AbstractScriptEngine {
private ScriptEngineFactory factory;
public JKScriptEngine(ScriptEngineFactory factory) {
this.factory = factory;
}
@Override
public Object eval(String script, ScriptContext context)
throws ScriptException {
try {
Expression exp = new Expression(script, context);
Object result = exp.eval();
return result;
}
catch (Exception e) {
throw new ScriptException(e.getMessage());
}
}
@Override
public Object eval(Reader reader, ScriptContext context)
throws ScriptException {
// Read all lines from the Reader
BufferedReader br = new BufferedReader(reader);
String script = "";
String str = null;
try {
while ((str = br.readLine()) != null) {
script = script + str;
}
}