i18n/addressinput/JsoMap.java

/*
 * Copyright (C) 2010 Google Inc.
 *
 * Licensed 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 com.android.i18n.addressinput;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;

import java.util.ArrayList;
import java.util.Iterator;

/**
 * Compatibility methods on top of the JSON data.
 */
class JsoMap extends JSONObject {

    /**
     * Construct a JsoMap object given some json text. This method directly evaluates the String
     * that you pass in; no error or safety checking is performed, so be very careful about the
     * source of your data.
     *
     * @param json JSON text describing an address format
     * @return a JsoMap object made from the supplied JSON.
     */
    static JsoMap buildJsoMap(String json) throws JSONException {
        return new JsoMap(new JSONTokener(json));
    }

    /**
     * Construct an empty JsoMap.
     *
     * @return the empty object.
     */
    static JsoMap createEmptyJsoMap() {
        return new JsoMap();
    }

    /**
     * constructor.
     */
    protected JsoMap() {
    }

    private JsoMap(JSONTokener readFrom) throws JSONException {
        super(readFrom);
    }

    private JsoMap(JSONObject copyFrom, String[] names) throws JSONException {
        super(copyFrom, names);
    }

    /**
     * Remove the specified key.
     *
     * @param key key name.
     */
    void delKey(String key) {
        super.remove(key);
    }

    /**
     * Retrieve the string value for specified key.
     *
     * @param key key name.
     * @return string value.
     * @throws ClassCastException, IllegalArgumentException.
     */
    @Override
    public String get(String key) {  // throws ClassCastException, IllegalArgumentException
        try {
            Object o = super.get(key);
            if (o instanceof String) {
                return (String) o;
            } else if (o instanceof Integer) {
                throw new IllegalArgumentException();
            } else {
                throw new ClassCastException();
            }
        } catch (JSONException e) {
            return null;
        }
    }

    /**
     * Access JSONObject.get(String) which is shadowed by JsoMap.get(String).
     *
     * @param name A key string.
     * @return The object associated with the key.
     * @throws JSONException if the key is not found.
     */
    private Object getObject(String name) throws JSONException {
        return super.get(name);
    }

    /**
     * Retrieves the integer value for specified key.
     *
     * @return integer value or -1 if value is undefined.
     */
    @Override
    public int getInt(String key) {
        try {
            Object o = super.get(key);
            if (o instanceof Integer) {
                return ((Integer) o).intValue();
            } else {
                throw new RuntimeException("Something other than an int was returned");
            }
        } catch (JSONException e) {
            return -1;
        }
    }

    /**
     * Collect all the keys and return as a JSONArray.
     *
     * @return A JSONArray that contains all the keys.
     */
    JSONArray getKeys() {
        return super.names();
    }

    /**
     * Retrieve the JsoMap object for specified key.
     *
     * @param key key name.
     * @return JsoMap object.
     * @throws ClassCastException, IllegalArgumentException.
     */
    @SuppressWarnings("unchecked")
    // JSONObject.keys() has no type information.
    JsoMap getObj(String key)
            throws ClassCastException, IllegalArgumentException {
        try {
            Object o = super.get(key);
            if (o instanceof JSONObject) {
                JSONObject value = (JSONObject) o;
                ArrayList<String> keys = new ArrayList<String>(value.length());
                for (Iterator<String> it = value.keys(); it.hasNext();) {
                    keys.add(it.next());
                }
                String[] names = new String[keys.size()];
                return new JsoMap(value, keys.toArray(names));
            } else if (o instanceof Integer) {
                throw new IllegalArgumentException();
            } else {
                throw new ClassCastException();
            }
        } catch (JSONException e) {
            return null;
        }
    }

    /**
     * Check if the object has specified key.
     *
     * @param key The key name to be checked.
     * @return true if key can be found.
     */
    boolean containsKey(String key) {
        return super.has(key);
    }

    /**
     * Merge those keys not found in this object from specified object.
     *
     * @param obj The other object to be merged.
     */
    void mergeData(JsoMap obj) {
        if (obj == null) {
            return;
        }

        JSONArray names = obj.names();
        if (names == null) {
            return;
        }

        for (int i = 0; i < names.length(); i++) {
            try {
                String name = names.getString(i);
                try {
                    if (!super.has(name)) {
                        super.put(name, obj.getObject(name));
                    }
                } catch (JSONException e) {
                    throw new RuntimeException(e);
                }
            } catch (JSONException e) {
                // Ignored.
            }
        }
    }

    /**
     * Save a string to string mapping into this map.
     *
     * @param key   the string key.
     * @param value the String value.
     */
    void put(String key, String value) {
        try {
            super.put(key, value);
        } catch (JSONException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Save a string to integer mapping into this map.
     *
     * @param key   the string key.
     * @param value the integer value.
     */
    void putInt(String key, int value) {
        try {
            super.put(key, value);
        } catch (JSONException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Save a string to JSONObject mapping into this map.
     *
     * @param key   the string key.
     * @param value a JSONObject as value.
     */
    void putObj(String key, JSONObject value) {
        try {
            super.put(key, value);
        } catch (JSONException e) {
            throw new RuntimeException(e);
        }
    }

    String string() throws ClassCastException, IllegalArgumentException {
        StringBuilder sb = new StringBuilder("JsoMap[\n");
        JSONArray keys = getKeys();
        for (int i = 0; i < keys.length(); i++) {
            String key;
            try {
                key = keys.getString(i);
            } catch (JSONException e) {
                throw new RuntimeException(e);
            }
            sb.append('(').append(key).append(':').append(get(key)).append(')').append('\n');
        }
        sb.append(']');
        return sb.toString();
    }

    String map() throws ClassCastException, IllegalArgumentException {
        StringBuilder sb = new StringBuilder("JsoMap[\n");
        JSONArray keys = getKeys();
        for (int i = 0; i < keys.length(); i++) {
            String key;
            try {
                key = keys.getString(i);
            } catch (JSONException e) {
                throw new RuntimeException(e);
            }
            sb.append('(').append(key).append(':').append(getObj(key).string()).append(')')
                    .append('\n');
        }
        sb.append(']');
        return sb.toString();
    }
}