/android/import-contacts

/*

 * ContactsCache.java

 *

 * Copyright (C) 2011 to 2012 Tim Marston <tim@ed.am>

 *

 * This file is part of the Import Contacts program (hereafter referred

 * to as "this program"). For more information, see

 * http://ed.am/dev/android/import-contacts

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

package am.ed.importcontacts;

import java.util.HashMap;

import java.util.HashSet;

import java.util.Locale;

public class ContactsCache

{

	/**

	 * A thing that can be used to identify (or lookup) a contact within the

	 * contacts cache.  It is not a reference to a cache entry and may not

	 * identify an existing contact in the cache.

	 */

	public static class CacheIdentifier

	{

		public enum Type { NAME, ORGANISATION, PRIMARY_NUMBER, PRIMARY_EMAIL }

		private Type _type;

		private String _detail;

		/**

		 * Obtain a cache identifier.  This routine is designed to be as robust

		 * as possible (in terms of bad or null detail values), and to return

		 * null when a cache identifier can not be created.

		 * @param type the detail type

		 * @param detail the detail

		 * @return the cache identifier, or null

		 */

		public static CacheIdentifier factory( Type type, String detail )

		{

			switch( type )

			{

			case NAME: detail = normaliseName( detail ); break;

			case ORGANISATION: detail = normaliseOrganisation( detail ); break;

			case PRIMARY_NUMBER: detail = normalisePhoneNumber( detail ); break;

			case PRIMARY_EMAIL: detail = normaliseEmailAddress( detail ); break;

			default: return null;

			}

			if( detail == null ) return null;

			return new CacheIdentifier( type, detail );

		}

		/**

		 * Obtain a cache identifier from contact data.  This routine is

		 * designed to be as robust as possible and may return null when a cache

		 * identifier can not be created.

		 * @param contact the contact data

		 * @return the cache identifier, or null

		 */

		public static CacheIdentifier factory( Importer.ContactData contact )

		{

			CacheIdentifier ret = null;

			if( contact.hasName() )

				ret = factory( CacheIdentifier.Type.NAME,

					contact.getName() );

			if( ret == null && contact.hasPrimaryOrganisation() )

				ret = factory( CacheIdentifier.Type.ORGANISATION,

					contact.getPrimaryOrganisation() );

			if( ret == null && contact.hasPrimaryNumber() )

				ret = factory( CacheIdentifier.Type.PRIMARY_NUMBER,

					contact.getPrimaryNumber() );

			if( ret == null && contact.hasPrimaryEmail() )

				ret = factory( CacheIdentifier.Type.PRIMARY_EMAIL,

					contact.getPrimaryEmail() );

			return ret;

		}

		protected CacheIdentifier( Type type, String detail )

		{

			_type = type;

			_detail = detail;

		}

		public Type getType()

		{

			return _type;

		}

		public String getDetail()

		{

			return _detail;

		}

	}

	// mappings of contact names, organisations and primary numbers to ids

	private HashMap< String, Long > _contactsByName

		= new HashMap< String, Long >();

	private HashMap< String, Long > _contactsByOrg

		= new HashMap< String, Long >();

	private HashMap< String, Long > _contactsByNumber

		= new HashMap< String, Long >();

	private HashMap< String, Long > _contactsByEmail

		= new HashMap< String, Long >();

	// mapping of contact ids to sets of associated data

	private HashMap< Long, HashSet< String > > _contactNumbers

		= new HashMap< Long, HashSet< String > >();

	private HashMap< Long, HashSet< String > > _contactEmails

		= new HashMap< Long, HashSet< String > >();

	private HashMap< Long, HashSet< String > > _contactAddresses

		= new HashMap< Long, HashSet< String > >();

	private HashMap< Long, HashSet< String > > _contactOrganisations

		= new HashMap< Long, HashSet< String > >();

	private HashMap< Long, HashSet< String > > _contactNotes

		= new HashMap< Long, HashSet< String > >();

	public boolean canLookup( CacheIdentifier identifier )

	{

		return lookup( identifier ) != null;

	}

	/**

	 * Retrieve the contact id of a contact identified by the specified cache

	 * identifier, if it exists.

	 * @param identifier the cache identifier

	 * @return a contact id, or null

	 */

	public Long lookup( CacheIdentifier identifier )

	{

		switch( identifier.getType() )

		{

		case NAME:

			return _contactsByName.get( identifier.getDetail() );

		case ORGANISATION:

			return _contactsByOrg.get( identifier.getDetail() );

		case PRIMARY_NUMBER:

			return _contactsByNumber.get( identifier.getDetail() );

		case PRIMARY_EMAIL:

			return _contactsByEmail.get( identifier.getDetail() );

		}

		return null;

	}

	/**

	 * Remove any cache entry that is identified by the cache identifier.

	 * @param identifier the cache identifier

	 * @return the contact id of the contact that was removed, or null

	 */

	public Long removeLookup( CacheIdentifier identifier )

	{

		switch( identifier.getType() )

		{

		case NAME:

			return _contactsByName.remove( identifier.getDetail() );

		case ORGANISATION:

			return _contactsByOrg.remove( identifier.getDetail() );

		case PRIMARY_NUMBER:

			return _contactsByNumber.remove( identifier.getDetail() );

		case PRIMARY_EMAIL:

			return _contactsByEmail.remove( identifier.getDetail() );

		}

		return null;

	}

	/**

	 * Add a lookup from a contact identifier to a contact id to the cache.

	 * @param identifier the cache identifier

	 * @param id teh contact id

	 */

	public void addLookup( CacheIdentifier identifier, Long id )

	{

		switch( identifier.getType() )

		{

		case NAME:

			_contactsByName.put( identifier.getDetail(), id );

			break;

		case ORGANISATION:

			_contactsByOrg.put( identifier.getDetail(), id );

			break;

		case PRIMARY_NUMBER:

			_contactsByNumber.put( identifier.getDetail(), id );

			break;

		case PRIMARY_EMAIL:

			_contactsByEmail.put( identifier.getDetail(), id );

			break;

		}

	}

	/**

	 * Remove any data that is associated with an contact id.

	 * @param id

	 */

	public void removeAssociatedData( Long id )

	{

		_contactNumbers.remove( id );

		_contactEmails.remove( id );

		_contactAddresses.remove( id );

		_contactOrganisations.remove( id );

		_contactNotes.remove( id );

	}

	public boolean hasAssociatedNumber( Long id, String number )

	{

		number = normalisePhoneNumber( number );

		if( number == null ) return false;

		HashSet< String > set = _contactNumbers.get( id );

		return set != null && set.contains( number );

	}

	public void addAssociatedNumber( Long id, String number )

	{

		number = normalisePhoneNumber( number );

		if( number == null ) return;

		HashSet< String > set = _contactNumbers.get( id );

		if( set == null ) {

			set = new HashSet< String >();

			_contactNumbers.put( id, set );

		}

		set.add( number );

	}

	public boolean hasAssociatedEmail( Long id, String email )

	{

		email = normaliseEmailAddress( email );

		if( email == null ) return false;

		HashSet< String > set = _contactEmails.get( id );

		return set != null && set.contains( email );

	}

	public void addAssociatedEmail( Long id, String email )

	{

		email = normaliseEmailAddress( email );

		if( email == null ) return;

		HashSet< String > set = _contactEmails.get( id );

		if( set == null ) {

			set = new HashSet< String >();

			_contactEmails.put( id, set );

		}

		set.add( email );

	}

	public boolean hasAssociatedAddress( Long id, String address )

	{

		address = normaliseAddress( address );

		if( address == null ) return false;

		HashSet< String > set = _contactAddresses.get( id );

		return set != null && set.contains( address );

	}

	public void addAssociatedAddress( Long id, String address )

	{

		address = normaliseAddress( address );

		if( address == null ) return;

		HashSet< String > set = _contactAddresses.get( id );

		if( set == null ) {

			set = new HashSet< String >();

			_contactAddresses.put( id, set );

		}

		set.add( address );

	}

	public boolean hasAssociatedOrganisation( Long id, String organisation )

	{

		organisation = normaliseOrganisation( organisation );

		if( organisation == null ) return false;

		HashSet< String > set = _contactOrganisations.get( id );

		return set != null && set.contains( organisation );

	}

	public void addAssociatedOrganisation( Long id, String organisation )

	{

		organisation = normaliseOrganisation( organisation );

		if( organisation == null ) return;

		HashSet< String > set = _contactOrganisations.get( id );

		if( set == null ) {

			set = new HashSet< String >();

			_contactOrganisations.put( id, set );

		}

		set.add( organisation );

	}

	public boolean hasAssociatedNote( Long id, String note )

	{

		note = normaliseNote( note );

		if( note == null ) return false;

		HashSet< String > set = _contactNotes.get( id );

		return set != null && set.contains( note );

	}

	public void addAssociatedNote( Long id, String note )

	{

		note = normaliseNote( note );

		if( note == null ) return;

		HashSet< String > set = _contactNotes.get( id );

		if( set == null ) {

			set = new HashSet< String >();

			_contactNotes.put( id, set );

		}

		set.add( note );

	}

	static public String normaliseName( String name )

	{

		if( name == null ) return null;

		name = name.trim();

		return name.length() > 0? name : null;

	}

	static public String normalisePhoneNumber( String number )

	{

		if( number == null ) return null;

		number = number.trim().replaceAll( "[-\\(\\) ]", "" );

		return number.length() > 0? number : null;

	}

	static public String normaliseEmailAddress( String email )

	{

		if( email == null ) return null;

		email = email.trim().toLowerCase( Locale.US );

		return email.length() > 0? email : null;

	}

	static public String normaliseOrganisation( String organisation )

	{

		if( organisation == null ) return null;

		organisation = organisation.trim();

		return organisation.length() > 0? organisation : null;

	}

	static public String normaliseAddress( String address )

	{

		if( address == null ) return null;

		address = address.trim();

		return address.length() > 0? address : null;

	}

	static public String normaliseNote( String note )

	{

		if( note == null ) return null;

		note = note.trim();

		return note.length() > 0? note : null;

	}

}