DupeBlocker - Sample Customer Matching API

Note:  This sample is very basic and just displays the ids of duplicates found when saving a Lead from a custom VisualForce Page.

VisualForce Page:  LeadCreation.page

<apex:page standardController="Lead" extensions="LeadCreationController">
    <apex:form >
        <apex:pageMessages escape="false" />
        <apex:pageBlock >
            <apex:pageBlockButtons >
                <apex:commandButton value="Save" action="{!saveLead}" />
            </apex:pageBlockButtons>
            <apex:pageBlockSection >
                <apex:inputField value="{!Lead.FirstName}" />
                <apex:inputField value="{!Lead.Phone}" />
                <apex:inputField value="{!Lead.LastName}" />
                <apex:inputField value="{!Lead.Email}" />
                <apex:inputField value="{!Lead.Company}" />
            </apex:pageBlockSection>
        </apex:pageBlock>
    </apex:form>
</apex:page>

Apex Class:  LeadCreationController.cls

public with sharing class LeadCreationController
{
     public Lead newLead;

     public LeadCreationController( ApexPages.StandardController stdController )
     {
         this.newLead = (Lead)stdController.getRecord();
     }

     public pageReference saveLead()
     {
         // Look for duplicates before trying to save.
         List<CRMfusionDBR101.DB_Api.Matches> matchSets = CRMfusionDBR101.DB_Api.findMatches( newLead );

         if ( matchSets.isEmpty() )
         {
             // No matches were found, try to save.
             try
             {
                 insert newLead;
             }
             catch ( Exception e )
             {
                 ApexPages.addMessages( e );
                 return null;
             }
             return new pageReference( '/' + newLead.id );
         }
         else
         {
             // Matches were found, just display the list of matching ids in an error
             // message as a basic example.
             String errorMessage = 'Duplicate leads found: ';
             for ( CRMfusionDBR101.DB_Api.Matches matchSet : matchSets )
                 for ( Id leadId : matchSet.matchedIds )
                     errorMessage += leadId + ', ';
             // Trim the trailing ', ';
             errorMessage = errorMessage.subString( 0, errorMessage.length() - 2);
             // Return the error.
             ApexPages.Message pageMessage = new ApexPages.Message( ApexPages.Severity.ERROR, errorMessage );
             ApexPages.addMessage( pageMessage );
             return null;
         }
     }
}