1 /*
   2  * Copyright (c) 2006, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package javax.tools;
  27 
  28 import java.util.ArrayList;
  29 import java.util.Collections;
  30 import java.util.List;
  31 import java.util.Objects;
  32 
  33 /**
  34  * Provides an easy way to collect diagnostics in a list.
  35  *
  36  * @param <S> the type of source objects used by diagnostics received
  37  * by this object
  38  *
  39  * @author Peter von der Ah&eacute;
  40  * @since 1.6
  41  */
  42 public final class DiagnosticCollector<S> implements DiagnosticListener<S> {
  43     private List<Diagnostic<? extends S>> diagnostics =
  44             Collections.synchronizedList(new ArrayList<Diagnostic<? extends S>>());
  45 
  46     public void report(Diagnostic<? extends S> diagnostic) {
  47         Objects.requireNonNull(diagnostic);
  48         diagnostics.add(diagnostic);
  49     }
  50 
  51     /**
  52      * Returns a list view of diagnostics collected by this object.
  53      *
  54      * @return a list view of diagnostics
  55      */
  56     public List<Diagnostic<? extends S>> getDiagnostics() {
  57         return Collections.unmodifiableList(diagnostics);
  58     }
  59 }