/*
* 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
*
* 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 groovy.json;
import groovy.lang.Closure;
import groovy.lang.GroovyObjectSupport;
import java.util.*;
/**
* Utility class used as delegate of closures representing JSON objects.
*
* @author Guillaume Laforge
* @author Andrey Bloschetsov
* @since 1.8.0
*/
public class JsonDelegate extends GroovyObjectSupport {
private final Map<String, Object> content = new LinkedHashMap<String, Object>();
/**
* Intercepts calls for setting a key and value for a JSON object
*
* @param name the key name
* @param args the value associated with the key
*/
public Object invokeMethod(String name, Object args) {
Object val = null;
if (args != null && Object[].class.isAssignableFrom(args.getClass())) {
Object[] arr = (Object[]) args;
if (arr.length == 1) {
val = arr[0];
} else if (isIterableOrArrayAndClosure(arr)) {
Closure<?> closure = (Closure<?>) arr[1];
Iterator<?> iterator = (arr[0] instanceof Iterable) ?
((Iterable) arr[0]).iterator() : Arrays.asList((Object[])arr[0]).iterator();
List<Object> list = new ArrayList<Object>();
while (iterator.hasNext()) {
list.add(curryDelegateAndGetContent(closure, iterator.next()));
}
val = list;
} else {
val = Arrays.asList(arr);
}
}
content.put(name, val);
return val;
}
private static boolean isIterableOrArrayAndClosure(Object[] args) {
if (args.length != 2 || !(args[1] instanceof Closure)) {
return false;
}
return ((args[0] instanceof Iterable) || (args[0] != null && args[0].getClass().isArray()));
}
/**
* Factory method for creating <code>JsonDelegate</code>s from closures.
*
* @param c closure representing JSON objects
* @return an instance of <code>JsonDelegate</code>
*/
public static Map<String, Object> cloneDelegateAndGetContent(Closure<?> c) {
JsonDelegate delegate = new JsonDelegate();
Closure<?> cloned = (Closure<?>) c.clone();
cloned.setDelegate(delegate);
cloned.setResolveStrategy(Closure.DELEGATE_FIRST);
cloned.call();
return delegate.getContent();
}
/**
* Factory method for creating <code>JsonDelegate</code>s from closures currying an object
* argument.
*
* @param c closure representing JSON objects
* @param o an object curried to the closure
* @return an instance of <code>JsonDelegate</code>
*/
public static Map<String, Object> curryDelegateAndGetContent(Closure<?> c, Object o) {
JsonDelegate delegate = new JsonDelegate();
Closure<?> curried = c.curry(o);
curried.setDelegate(delegate);
curried.setResolveStrategy(Closure.DELEGATE_FIRST);
curried.call();
return delegate.getContent();
}
public Map<String, Object> getContent() {
return content;
}
}