public FieldDeclaration declarationOf(FieldBinding fieldBinding){
  if (fieldBinding != null && this.fields != null) {
    for (int i=0, max=this.fields.length; i < max; i++) {
      FieldDeclaration fieldDecl;
      if ((fieldDecl=this.fields[i]).binding == fieldBinding)       return fieldDecl;
    }
  }
  return null;
}

public FieldDeclaration declarationOf ( FieldBinding fieldBinding ) { if ( fieldBinding != null && this . fields != null ) { for ( int i = 0 , max = this . fields . length ; i < max ; i ++ ) { FieldDeclaration fieldDecl ; if ( ( fieldDecl = this . fields [ i ] ) . binding == fieldBinding ) return fieldDecl ; } } return null ; }
find the matching parse node , answers null if nothing found
