001 /* 002 * JBoss DNA (http://www.jboss.org/dna) 003 * See the COPYRIGHT.txt file distributed with this work for information 004 * regarding copyright ownership. Some portions may be licensed 005 * to Red Hat, Inc. under one or more contributor license agreements. 006 * See the AUTHORS.txt file in the distribution for a full listing of 007 * individual contributors. 008 * 009 * JBoss DNA is free software. Unless otherwise indicated, all code in JBoss DNA 010 * is licensed to you under the terms of the GNU Lesser General Public License as 011 * published by the Free Software Foundation; either version 2.1 of 012 * the License, or (at your option) any later version. 013 * 014 * JBoss DNA is distributed in the hope that it will be useful, 015 * but WITHOUT ANY WARRANTY; without even the implied warranty of 016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 017 * Lesser General Public License for more details. 018 * 019 * You should have received a copy of the GNU Lesser General Public 020 * License along with this software; if not, write to the Free 021 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 022 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 023 */ 024 package org.jboss.dna.common.collection; 025 026 import java.util.LinkedList; 027 import java.util.List; 028 import net.jcip.annotations.NotThreadSafe; 029 030 /** 031 * A list of problems for some execution context. The problems will be {@link #iterator() returned} in the order in which they 032 * were encountered (although this cannot be guaranteed in contexts involving multiple threads or processes). 033 * 034 * @author Randall Hauch 035 * @author John Verhaeg 036 */ 037 @NotThreadSafe 038 public class SimpleProblems extends AbstractProblems { 039 040 private List<Problem> problems; 041 042 /** 043 * {@inheritDoc} 044 * 045 * @see org.jboss.dna.common.collection.AbstractProblems#addProblem(Problem) 046 */ 047 @Override 048 protected void addProblem( Problem problem ) { 049 if (problem == null) return; 050 if (problems == null) problems = new LinkedList<Problem>(); 051 problems.add(problem); 052 } 053 054 /** 055 * {@inheritDoc} 056 * 057 * @see org.jboss.dna.common.collection.AbstractProblems#getProblems() 058 */ 059 @Override 060 protected List<Problem> getProblems() { 061 return this.problems != null ? problems : EMPTY_PROBLEMS; 062 } 063 }