/**
* 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.ArrayList;
import java.util.Collection;
import java.util.Map;
import com.googlecode.aviator.exception.ExpressionRuntimeException;
import com.googlecode.aviator.runtime.function.AbstractFunction;
import com.googlecode.aviator.runtime.function.FunctionUtils;
import com.googlecode.aviator.runtime.type.AviatorFunction;
import com.googlecode.aviator.runtime.type.AviatorJavaType;
import com.googlecode.aviator.runtime.type.AviatorObject;
import com.googlecode.aviator.runtime.type.AviatorRuntimeJavaType;
/**
* map(col,fun) function to iterate seq with function
*
* @author dennis
*
*/
public class SeqMapFunction extends AbstractFunction {
@Override
@SuppressWarnings("unchecked")
public AviatorObject call(Map<String, Object> env, AviatorObject arg1, AviatorObject arg2) {
Object first = arg1.getValue(env);
AviatorFunction fun = FunctionUtils.getFunction(arg2, env, 1);
if (fun == null) {
throw new ExpressionRuntimeException("There is no function named " + ((AviatorJavaType) arg2).getName());
}
if (first == null) {
throw new NullPointerException("null seq");
}
Class<?> clazz = first.getClass();
if (Collection.class.isAssignableFrom(clazz)) {
Collection<Object> result = null;
try {
result = (Collection<Object>) clazz.newInstance();
}
catch (Throwable t) {
// ignore
result = new ArrayList<Object>();
}
for (Object obj : (Collection<?>) first) {
result.add(fun.call(env, new AviatorRuntimeJavaType(obj)).getValue(env));
}
return new AviatorRuntimeJavaType(result);
}
else if (clazz.isArray()) {
// Object[] seq = (Object[]) first;
int length = Array.getLength(first);
Object result = Array.newInstance(Object.class, length);
int index = 0;
for (int i = 0; i < length; i++) {
Object obj = Array.get(first, i);
Array.set(result, index++, fun.call(env, new AviatorRuntimeJavaType(obj)).getValue(env));
}
return new AviatorRuntimeJavaType(result);
}
else {
throw new IllegalArgumentException(arg1.desc(env) + " is not a seq");
}
}
public String getName() {
return "map";
}
}