/**
* 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.function.seq;
import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Map;
import com.googlecode.aviator.runtime.function.AbstractFunction;
import com.googlecode.aviator.runtime.type.AviatorLong;
import com.googlecode.aviator.runtime.type.AviatorObject;
/**
* count(seq) to get seq's size
*
* @author dennis
*
*/
public class SeqCountFunction extends AbstractFunction {
@Override
public AviatorObject call(Map<String, Object> env, AviatorObject arg1) {
Object value = arg1.getValue(env);
if (value == null) {
throw new NullPointerException("null seq");
}
Class<?> clazz = value.getClass();
int size = -1;
if (Collection.class.isAssignableFrom(clazz)) {
Collection<?> col = (Collection<?>) value;
size = col.size();
}
else if (clazz.isArray()) {
size = Array.getLength(value);
}
else {
throw new IllegalArgumentException(arg1.desc(env) + " is not a seq collection");
}
return AviatorLong.valueOf(size);
}
public String getName() {
return "count";
}
}