api.util.JsonObjectMap.java Source code

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Here is the source code for api.util.JsonObjectMap.java

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/*
 * 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 api.util;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.AbstractMap;
import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;

public abstract class JsonObjectMap<T> extends AbstractMap<String, T> {
    final JSONObject object;

    protected JsonObjectMap(JSONObject object) {
        this.object = object;
    }

    @Override
    public T get(Object key) {
        return read(object.opt((String) key));
    }

    @Override
    public T put(String key, T value) {
        T val = read(object.opt(key));
        try {
            object.put(key, write(value));
        } catch (JSONException e) {
        }
        return val;
    }

    @Override
    public int size() {
        return object.length();
    }

    @Override
    public Set<Entry<String, T>> entrySet() {
        Iterator it = object.keys();
        TreeSet set = new TreeSet();
        while (it.hasNext()) {
            final String key = (String) it.next();
            set.add(new Entry<String, Object>() {
                @Override
                public String getKey() {
                    return key;
                }

                @Override
                public Object getValue() {
                    return get(key);
                }

                @Override
                public Object setValue(Object value) {
                    throw new UnsupportedOperationException();
                }
            });
        }
        return set;
    }

    @Override
    public void clear() {
        Iterator it = object.keys();
        while (it.hasNext())
            object.remove((String) it.next());
    }

    @Override
    public T remove(Object key) {
        Object val = get(key);
        object.remove((String) key);
        return read(val);
    }

    protected abstract T read(Object val);

    protected abstract Object write(T element);

}