//     File: NativeAddressBook.java

// Abstract: Accesses the native address book, and vends Person objects.

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package com.example.app.addressbook;

import java.util.*;

/**

 * Abstraction for the Mac OS X AddressBook API

 * 

 * Creates a copy of contacts from the address book, and vends Person

 * objects. Uses JNI to obtain simple List, Map, String, and Number

 * representations of ABPerson properties.

 */

public class NativeAddressBook {

    static {

        // ensure native JNI library is loaded

        System.loadLibrary("AddressBook");

    }

    // JNI method which obtains the UID of the "me" card in Address Book.app

    private static native String nativeGetMyUID();

    // JNI method that fetches the list of everyone as a list of maps

    private static native List<Map<String,?>> nativeGetAddressBookContacts();

    private static native void nativeEditContact(final String uid);

    List<Person> everyone;

    public List<Person> getEveryone() {

        if (everyone != null) return everyone;

        final List<Map<String, ?>> rawContacts = nativeGetAddressBookContacts();

        final List<Person> people = new ArrayList<Person>();

        for (final Map<String, ?> rawContact : rawContacts) {

            final Person person = new Person(rawContact);

            if ("".equals(person.getFullName())) continue; // strip out the nameless

            people.add(person);

        }

        return everyone = Collections.unmodifiableList(people);

    }

    public Person getMe() {

        final String myUID = nativeGetMyUID();

        if (myUID == null) return null;

        final List<Person> people = getEveryone();

        for (final Person person : people) {

            if (myUID.equals(person.getUID())) return person;

        }

        return null;

    }

    public void editPerson(final Person person) {

        if (person == null) throw new NullPointerException("Cannot edit a null person");

        final String uid = person.getUID();

        if (uid == null) throw new NullPointerException("Cannot edit a person with a null UID");

        nativeEditContact(uid);

    }

}