/**
* Copyright (C) 2010 dennis zhuang (killme2008@gmail.com)
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
**/
package com.googlecode.aviator.runtime.method;
import java.util.List;
import java.util.Map;
import com.googlecode.aviator.exception.ExpressionRuntimeException;
import com.googlecode.aviator.runtime.type.AviatorFunction;
import com.googlecode.aviator.runtime.type.AviatorNil;
import com.googlecode.aviator.runtime.type.AviatorObject;
import com.googlecode.aviator.runtime.type.AviatorType;
/**
* A aviator method variable
*
* @author dennis
*
*/
public class AviatorMethod extends AviatorObject {
@Override
public int compare(AviatorObject other, Map<String, Object> env) {
throw new ExpressionRuntimeException("Could not compare method with " + other.desc(env));
}
@Override
public AviatorType getAviatorType() {
return AviatorType.Method;
}
@Override
public Object getValue(Map<String, Object> env) {
return this.methodName;
}
private final String methodName;
private volatile AviatorFunction cachedFunction;
public AviatorMethod(String methodName) {
super();
this.methodName = methodName;
}
public AviatorObject invoke(Map<String, Object> env, List<AviatorObject> list) {
if (cachedFunction == null) {
cachedFunction = (AviatorFunction) env.get(this.methodName);
}
if (cachedFunction == null) {
throw new ExpressionRuntimeException("Could not find method named " + methodName);
}
final AviatorObject result = cachedFunction.call(env, list.toArray(new AviatorObject[list.size()]));
return result == null ? AviatorNil.NIL : result;
}
}