a while back I needed to find the size of all the contributions of all the build results in a project..

here is the code that does that

package com.sd.tools;

import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.net.URI;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import com.ibm.team.build.client.ITeamBuildClient;
import com.ibm.team.build.common.model.IBuildEngine;
import com.ibm.team.build.common.model.IBuildResult;
import com.ibm.team.build.common.model.IBuildResultContribution;
import com.ibm.team.build.common.model.query.IBaseBuildEngineQueryModel.IBuildEngineQueryModel;
import com.ibm.team.build.common.model.query.IBaseBuildResultQueryModel.IBuildResultQueryModel;
import com.ibm.team.process.client.IProcessClientService;
import com.ibm.team.process.common.IProjectArea;
import com.ibm.team.process.common.IProjectAreaHandle;
import com.ibm.team.repository.client.IContentManager;
import com.ibm.team.repository.client.IItemManager;
import com.ibm.team.repository.client.ITeamRepository;
import com.ibm.team.repository.client.TeamPlatform;
import com.ibm.team.repository.client.ITeamRepository.*;
import com.ibm.team.repository.client.ITeamRepository.ILoginHandler.*;
import com.ibm.team.repository.common.IContent;
import com.ibm.team.repository.common.IFetchResult;
import com.ibm.team.repository.common.TeamRepositoryException;
import com.ibm.team.repository.common.query.IItemQuery;
import com.ibm.team.repository.common.query.IItemQueryPage;
import com.ibm.team.repository.common.query.ast.IPredicate;
import com.ibm.team.repository.common.service.IQueryService;
import com.ibm.team.repository.common.util.ObfuscationHelper;

public class DumpContributions
{
    private static boolean debug = false;
    private static int master_connection_timeout=24*60*60;
    private static ITeamRepository productionServer = null;
    private  static IProcessClientService prodprocessClient = null;   
    public final static String fContributionTypeId = IBuildResultContribution.LOG_EXTENDED_CONTRIBUTION_ID;

    private static class LoginHandler implements ILoginHandler, ILoginInfo
    {

        private String fUserId;
        private String fPassword;

        private LoginHandler(String userId, String password)
        {
            fUserId = userId;
            fPassword = password;
        }


        public String getUserId()
        {
            return fUserId;
        }


        public String getPassword()
        {
            return fPassword;
        }


        public ILoginInfo challenge(ITeamRepository repository)
        {
            return this;
        }
    }

    /**
     * @param args
     */
    public static void main(String[] args)
    {
        String productionURI = args[0];
        String produserId = args[1];
        String prodpassword = args[2];
        String prodprojectAreaName = args[3];

        try
        {
            IProjectArea iprja_prod = null;

            TeamPlatform.startup();
   
            // TODO Auto-generated method stub
            productionServer = TeamPlatform.getTeamRepositoryService().getTeamRepository(productionURI);
   
            if (debug) System.out.println("logging in\n");
            try
            {
                // decrypt the user password, if encrypted
                prodpassword = ObfuscationHelper.decryptString(prodpassword);
            }
            catch(Exception ex)
            {
                // nothing to do, variable not overlayed on error
            }
            productionServer.registerLoginHandler(new LoginHandler(produserId, prodpassword));
   
            productionServer.setConnectionTimeout(master_connection_timeout);       

            productionServer.login(null);
            prodprocessClient = (IProcessClientService) productionServer
                    .getClientLibrary(IProcessClientService.class);
            URI produri = URI.create(prodprojectAreaName.replaceAll(" ", "%20"));
            iprja_prod = (IProjectArea) prodprocessClient.findProcessArea(produri, null, null);   
            ITeamBuildClient buildClient = (ITeamBuildClient) productionServer.getClientLibrary(ITeamBuildClient.class);
            for(IBuildResult br:  getBuildResultsforProjectArea(iprja_prod))
            {
                System.out.println("Build result for build = "+br.getLabel());
                IBuildResultContribution[] ibrcl =buildClient.getBuildResultContributions(br, fContributionTypeId, null);
                System.out.println(" there are "+ibrcl.length+" contributions to display");
                for(IBuildResultContribution ibrc : ibrcl)
                {
                    System.out.println("entry");
                    String r=getContent(ibrc.getExtendedContributionData(), productionServer.contentManager());
                    System.out.println("content size= "+r.length());
                    //System.out.println("content ="+getContent(ibrc.getExtendedContributionData(), productionServer.contentManager()));
                }
            }                   

        }
        catch (TeamRepositoryException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }         
        TeamPlatform.shutdown();

    }
    private static String getContent(IContent ic, IContentManager icm)
    {
        // make an output stream for the content manager
        OutputStream os = new ByteArrayOutputStream();
        // get the content of the content object.
        try
        {
            if (ic != null)
            {
                icm.retrieveContent(ic, os, null);
                return os.toString();
            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        return null;
    }   
    private static ArrayList<IBuildResult> getBuildResultsforProjectArea(IProjectAreaHandle iprja)
    {
        Boolean allProperties = true;
        // allocate space for results
        ArrayList<IBuildResult> allbe = new ArrayList<IBuildResult>();
        ITeamRepository repo= (ITeamRepository)iprja.getOrigin();
        // get the data interface
        ITeamBuildClient buildClient = (ITeamBuildClient) repo.getClientLibrary(ITeamBuildClient.class);

        try
        {
            IBuildResultQueryModel queryModel = IBuildResultQueryModel.ROOT;
            // create a query for build engines
            IItemQuery query = IItemQuery.FACTORY.newInstance(queryModel);
            // objects of build engine type
            IPredicate isBuildResultType = queryModel._isTypeOf(IBuildResult.ITEM_TYPE);
            // the query filter
            //IPredicate filter = queryModel._in(new IItemHandleInputArg[] { query.newItemHandleArg() });
            query.filter(isBuildResultType);
            // no parameters required
            IItemQueryPage queryPage = buildClient.queryItems(query,
            // com.ibm.team.repository.common.service.IQueryService.EMPTY_PARAMETERS,
                    new Object[0], IQueryService.ITEM_QUERY_MAX_PAGE_SIZE, null);

            // if there are buildengines defined

            if (queryPage.getResultSize() != 0)
            {

                while (queryPage != null)
                {

                    IFetchResult fetchResult = null;
                    if (allProperties == true)
                    {
                        fetchResult = repo.itemManager().fetchCompleteItemsPermissionAware(queryPage.getItemHandles(),
                                IItemManager.DEFAULT, null);
                    }
                    else
                    {
                        // print out a page of IDs of the retrieved build
                        // engines
                        final String[] all_properties = new String[]
                        { IBuildEngine.PROPERTY_ACTIVE, IBuildEngine.PROPERTY_BUILD_ENGINE_ACTIVITY,
                                IBuildEngine.PROPERTY_DESCRIPTION, IBuildEngine.PROPERTY_ENGINE_CONTACT_INTERVAL,
                                IBuildEngine.PROPERTY_ID, IBuildEngine.PROPERTY_PROCESS_AREA,
                                IBuildEngine.PROPERTY_SUPPORTED_BUILD_DEFINITIONS,
                                IBuildEngine.PROPERTY_SUPPORTS_CANCELLATION, IBuildEngine.PROPERTY_USE_TEAM_SCHEDULER,
                                IBuildEngine.PROPERTY_PROPERTIES, IBuildEngine.PROPERTY_CONFIGURATION_ELEMENTS };
                       
                        fetchResult = repo.itemManager().fetchPartialItemsPermissionAware(queryPage.getItemHandles(),
                                IItemManager.DEFAULT, Arrays.asList(all_properties), null);
                    }

                    // add these to the list
                    allbe.addAll(fetchResult.getRetrievedItems());

                    if (queryPage.hasNext())
                    {
                        queryPage = (IItemQueryPage) buildClient.fetchPage(queryPage.getToken(),
                                queryPage.getNextStartPosition(), queryPage.getSize(), null);
                    }
                    else
                    {
                        queryPage = null;
                    }

                }
            }
        }
        catch (Exception ex)
        {
            System.out.println("build exception=" + ex.getMessage());
        }
        return allbe;
    }

}