import mx.validators.EmailValidator;
import org.as3commons.lang.StringUtils;

/**
* This validator allows validation of multiple email addresses
* that are separated by a semicolon (;)
*/

public class CompositeEmailValidator extends EmailValidator
{
    public function CompositeEmailValidator()
    {
    }

    override protected function doValidation( value:Object ):Array
    {
        var result:Array = [];
        var emailsString:String = String( value );
        var emails:Array = StringUtils.tokenizeToArray( emailsString, ";" );

        for each (var email:String in emails)
        {
            var emailResult:Array = super.doValidation( email );

            if (emailResult.length > 0)
            {
                result = result.concat( emailResult );
            }
        }

        return result;
    }
}

import flexunit.framework.TestCase;

import mx.events.ValidationResultEvent;

public class CompositeEmailValidatorTest extends TestCase
{

    public function CompositeEmailValidatorTest()
    {

    }

    public function testSingleEmail():void
    {
        var validator:CompositeEmailValidator = new CompositeEmailValidator();
        var result:ValidationResultEvent = validator.validate( "wdb@company.com" );

        assertEquals( ValidationResultEvent.VALID, result.type );
    }

    public function testSingleEmailInvalid():void
    {

        var validator:CompositeEmailValidator = new CompositeEmailValidator();
        var result:ValidationResultEvent = validator.validate( "wdbcompany.com" );

        assertEquals( ValidationResultEvent.INVALID, result.type );
    }

    public function testMultipleEmails():void
    {
        var validator:CompositeEmailValidator = new CompositeEmailValidator();

        var result:ValidationResultEvent = validator.validate( "wdb@company.com;tl@company.com" );

        assertEquals( ValidationResultEvent.VALID, result.type );
    }

    public function testMultipleEmailsInvalid():void
    {
        var validator:CompositeEmailValidator = new CompositeEmailValidator();

        var result:ValidationResultEvent = validator.validate( "wdb@company.com;tlcompany.com" );

        assertEquals( ValidationResultEvent.INVALID, result.type );
    }
}