/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package javax.script;
import java.io.Reader;
/**
* A standard imlementation of the ScriptEngine.
*/
abstract public class AbstractScriptEngine implements ScriptEngine {
protected ScriptContext context;
/**
* Creates a default script engine.
*/
public AbstractScriptEngine()
{
this.context = new SimpleScriptContext();
this.context.setBindings(createBindings(),
SimpleScriptContext.ENGINE_SCOPE);
}
/**
* Creates a default script engine.
*/
public AbstractScriptEngine(Bindings n)
{
this.context = new SimpleScriptContext();
this.context.setBindings(n, SimpleScriptContext.ENGINE_SCOPE);
}
/**
* Evaluates the script with the given context, returning any value.
*
* @param script path to the script
* @param context the script context
*/
abstract public Object eval(String script, ScriptContext context)
throws ScriptException;
/**
* Evaluates the script with the given context, returning any value.
*
* @param reader reader to the script
* @param context the script context
*/
abstract public Object eval(Reader reader, ScriptContext context)
throws ScriptException;
/**
* Evaluates the script with the given context, returning any value.
*
* @param reader reader to the script
* @param bindings the single bindings
*/
public Object eval(Reader reader, Bindings bindings)
throws ScriptException
{
ScriptContext engineCxt = getContext();
ScriptContext cxt = new SimpleScriptContext();
cxt.setReader(engineCxt.getReader());
cxt.setWriter(engineCxt.getWriter());
cxt.setErrorWriter(engineCxt.getErrorWriter());
cxt.setBindings(engineCxt.getBindings(ScriptContext.GLOBAL_SCOPE),
ScriptContext.GLOBAL_SCOPE);
cxt.setBindings(bindings, ScriptContext.ENGINE_SCOPE);
return eval(reader, cxt);
}
/**
* Evaluates the script with the given context, returning any value.
*
* @param script the script
* @param bindings the single bindings
*/
public Object eval(String script, Bindings bindings)
throws ScriptException
{
ScriptContext engineCxt = getContext();
ScriptContext cxt = new SimpleScriptContext();
cxt.setReader(engineCxt.getReader());
cxt.setWriter(engineCxt.getWriter());
cxt.setErrorWriter(engineCxt.getErrorWriter());
cxt.setBindings(engineCxt.getBindings(ScriptContext.GLOBAL_SCOPE),
ScriptContext.GLOBAL_SCOPE);
cxt.setBindings(bindings, ScriptContext.ENGINE_SCOPE);
return eval(script, cxt);
}
/**
* Evaluates the script with no extra context, returning any value.
*
* @param script path to the script
*/
public Object eval(String script)
throws ScriptException
{
return eval(script, getContext());
}
/**
* Evaluates the script with no extra context, returning any value.
*
* @param reader reader to the script
*/
public Object eval(Reader reader)
throws ScriptException
{
return eval(reader, getContext());
}
/**
* Sets an engine scope value.
*/
public void put(String key, Object value)
{
getBindings(ScriptContext.ENGINE_SCOPE).put(key, value);
}
/**
* Gets an engine scope value.
*/
public Object get(String key)
{
return getBindings(ScriptContext.ENGINE_SCOPE).get(key);
}
/**
* Returns a scope of named values.
*/
public Bindings getBindings(int scope)
{
return getContext().getBindings(scope);
}
/**
* Sets a scope of named values.
*/
public void setBindings(Bindings bindings, int scope)
{
getContext().setBindings(bindings, scope);
}
/**
* Returns the default script context.
*/
public ScriptContext getContext()
{
return this.context;
}
/**
* Sets the default script context.
*/
public void setContext(ScriptContext cxt)
{
this.context = cxt;
}
/**
* Returns the factory which owns the script engine.
*/
abstract public ScriptEngineFactory getFactory();
}