001 /* 002 * JBoss, Home of Professional Open Source. 003 * Copyright 2008, Red Hat Middleware LLC, and individual contributors 004 * as indicated by the @author tags. See the copyright.txt file in the 005 * distribution for a full listing of individual contributors. 006 * 007 * This is free software; you can redistribute it and/or modify it 008 * under the terms of the GNU Lesser General Public License as 009 * published by the Free Software Foundation; either version 2.1 of 010 * the License, or (at your option) any later version. 011 * 012 * This software is distributed in the hope that it will be useful, 013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 015 * Lesser General Public License for more details. 016 * 017 * You should have received a copy of the GNU Lesser General Public 018 * License along with this software; if not, write to the Free 019 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 020 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 021 */ 022 package org.jboss.dna.common.collection; 023 024 import java.util.LinkedList; 025 import java.util.List; 026 import net.jcip.annotations.NotThreadSafe; 027 028 /** 029 * A list of problems for some execution context. The problems will be {@link #iterator() returned} in the order in which they 030 * were encountered (although this cannot be guaranteed in contexts involving multiple threads or processes). 031 * 032 * @author Randall Hauch 033 * @author John Verhaeg 034 */ 035 @NotThreadSafe 036 public class SimpleProblems extends AbstractProblems { 037 038 private List<Problem> problems; 039 040 /** 041 * {@inheritDoc} 042 * 043 * @see org.jboss.dna.common.collection.AbstractProblems#addProblem(Problem) 044 */ 045 @Override 046 protected void addProblem( Problem problem ) { 047 if (problem == null) return; 048 if (problems == null) problems = new LinkedList<Problem>(); 049 problems.add(problem); 050 } 051 052 /** 053 * {@inheritDoc} 054 * 055 * @see org.jboss.dna.common.collection.AbstractProblems#getProblems() 056 */ 057 @Override 058 protected List<Problem> getProblems() { 059 return this.problems != null ? problems : EMPTY_PROBLEMS; 060 } 061 }