/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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
 *
 *    https://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 org.grails.datastore.mapping.reflect;

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

import groovy.lang.Closure;
import groovy.lang.GroovyObjectSupport;

/**
 * A simple class that takes method invocations and property setters and populates
 * the arguments of these into the supplied map ignoring null values.
 *
 * @author Graeme Rocher
 * @since 6.0
 */
@SuppressWarnings({"unchecked", "rawtypes"})
public class ClosureToMapPopulator extends GroovyObjectSupport {

    private Map map;

    public ClosureToMapPopulator(Map theMap) {
        map = theMap;
    }

    public ClosureToMapPopulator() {
        this(new HashMap());
    }

    public Map populate(Closure callable) {
        callable.setDelegate(this);
        callable.setResolveStrategy(Closure.DELEGATE_FIRST);
        callable.call();
        return map;
    }

    @Override
    public void setProperty(String name, Object o) {
        if (o != null) {
            map.put(name, o);
        }
    }

    @Override
    public Object invokeMethod(String name, Object o) {
        if (o != null) {
            if (o.getClass().isArray()) {
                Object[] args = (Object[]) o;
                if (args.length == 1) {
                    map.put(name, args[0]);
                }
                else {
                    map.put(name, Arrays.asList(args));
                }
            }
            else {
                map.put(name, o);
            }
        }
        return null;
    }
}
