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import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;

public class PersonFilter extends ViewerFilter {

  private String searchString;

  public void setSearchText(String s) {
    // ensure that the value can be used for matching 
    this.searchString = ".*" + s + ".*";
  }

  @Override
  public boolean select(Viewer viewer, 
      Object parentElement, 
      Object element) {
    if (searchString == null || searchString.length() == 0) {
      return true;
    }
    Person p = (Person) element;
    if (p.getFirstName().matches(searchString)) {
      return true;
    }
    if (p.getLastName().matches(searchString)) {
      return true;
    }

    return false;
  }
}