EEval.java

/***************************************************************************
   Copyright 2008 Emily Estes

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
***************************************************************************/
package net.metanotion.simpletemplate.interpreter;


import java.util.Arrays;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import net.metanotion.util.Dictionary;
import net.metanotion.util.Pair;
import net.metanotion.scripting.ObjectServer;

final class EEval implements Element {
	private static final Logger logger = LoggerFactory.getLogger(EEval.class);

	private final String object;
	private final String method;
	private final Element params;

	public EEval(String o, String m, Element p) {
		this.object = o;
		this.method = m;
		this.params = p;
	}

	@Override public Object eval(ObjectServer os, Object env) {
		Object p = params.eval(os, env);
		logger.debug(env.toString());
		logger.debug(p.toString());
		if(!(	(p instanceof Dictionary) ||
				(p instanceof Map) ||
				(p instanceof LTuple))) {
			logger.debug("Wrapping " + p);
			p = Arrays.asList(p);
		}
		final Map.Entry<String,Object> m = new Pair<String,Object>(method, p);
		Object obj = os.get(object);
		if(obj == null) { obj = ((Dictionary<String,Object>) env).get(object); }
		logger.debug(":" + object + "." + method + " against " + obj);
		return os.dispatcher(object).dispatch(m).call(obj);
	}
}