| package org.apache.maven.scm.util; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| import java.lang.ref.SoftReference; |
| import java.text.DateFormat; |
| import java.text.FieldPosition; |
| import java.text.ParsePosition; |
| import java.text.SimpleDateFormat; |
| import java.util.Date; |
| |
| /** |
| * Thread-safe version of java.text.DateFormat. |
| * You can declare it as a static final variable: |
| * @author Olivier Lamy |
| * <code> |
| * private static final ThreadSafeDateFormat DATE_FORMAT = new ThreadSafeDateFormat( DATE_PATTERN ); |
| * </code> |
| */ |
| public class ThreadSafeDateFormat |
| extends DateFormat |
| { |
| private static final long serialVersionUID = 3786090697869963812L; |
| |
| private final String m_sDateFormat; |
| |
| public ThreadSafeDateFormat( String sDateFormat ) |
| { |
| m_sDateFormat = sDateFormat; |
| } |
| |
| private final ThreadLocal<SoftReference<SimpleDateFormat>> m_formatCache = new ThreadLocal<SoftReference<SimpleDateFormat>>() |
| { |
| public SoftReference<SimpleDateFormat> get() |
| { |
| SoftReference<SimpleDateFormat> softRef = super.get(); |
| if ( softRef == null || softRef.get() == null ) |
| { |
| softRef = new SoftReference<SimpleDateFormat>( new SimpleDateFormat( m_sDateFormat ) ); |
| super.set( softRef ); |
| } |
| return softRef; |
| } |
| }; |
| |
| private DateFormat getDateFormat() |
| { |
| return m_formatCache.get().get(); |
| } |
| |
| public StringBuffer format( Date date, StringBuffer toAppendTo, FieldPosition fieldPosition ) |
| { |
| return getDateFormat().format( date, toAppendTo, fieldPosition ); |
| } |
| |
| public Date parse( String source, ParsePosition pos ) |
| { |
| return getDateFormat().parse( source, pos ); |
| } |
| } |