JsonArr.java

/**
 * Licensed to The Apereo Foundation under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 *
 * The Apereo Foundation licenses this file to you under the Educational
 * Community 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://opensource.org/licenses/ecl2.txt
 *
 * 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.opencastproject.util;

import static org.opencastproject.util.data.Monadics.mlist;
import static org.opencastproject.util.data.functions.Misc.cast;

import org.opencastproject.util.data.Function;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public final class JsonArr implements Iterable<JsonVal> {
  private final List<Object> val;

  public JsonArr(List arr) {
    this.val = new ArrayList<Object>(arr);
  }

  public JsonVal val(int index) {
    return new JsonVal(val.get(index));
  }

  public JsonObj obj(int index) {
    return new JsonObj((Map) val.get(index));
  }

  public JsonArr arr(int index) {
    return new JsonArr((List) val.get(index));
  }

  public <A> List<A> as(Function<Object, A> converter) {
    return mlist(val).map(converter).value();
  }

  public List<JsonVal> get() {
    return mlist(val).map(JsonVal.asJsonVal).value();
  }

  @Override
  public Iterator<JsonVal> iterator() {
    return mlist(val).map(JsonVal.asJsonVal).iterator();
  }

  private static <A> Function<Object, A> caster(final Class<A> ev) {
    return new Function<Object, A>() {
      @Override public A apply(Object o) {
        return cast(o, ev);
      }
    };
  }
}