001/*
002 * ModeShape (http://www.modeshape.org)
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *       http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.modeshape.common.collection;
017
018import java.util.LinkedList;
019import java.util.List;
020import org.modeshape.common.annotation.NotThreadSafe;
021
022/**
023 * A simple {@link Problems} collection. The problems will be {@link #iterator() returned} in the order in which they were
024 * encountered (although this cannot be guaranteed in contexts involving multiple threads or processes).
025 */
026@NotThreadSafe
027public class SimpleProblems extends AbstractProblems {
028    private static final long serialVersionUID = 1L;
029
030    private List<Problem> problems;
031
032    @Override
033    protected void addProblem( Problem problem ) {
034        if (problem == null) return;
035        if (problems == null) problems = new LinkedList<Problem>();
036        problems.add(problem);
037    }
038
039    @Override
040    protected List<Problem> getProblems() {
041        return this.problems != null ? problems : EMPTY_PROBLEMS;
042    }
043
044    @Override
045    public void addAll( Iterable<Problem> problems ) {
046        if (problems != null) {
047            if (problems == this) return;
048            if (this.problems == null) this.problems = new LinkedList<Problem>();
049            for (Problem problem : problems) {
050                this.problems.add(problem);
051            }
052        }
053    }
054}