001package org.apache.maven.plugins.enforcer;
002
003/*
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 *  http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied.  See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022import java.io.File;
023import java.io.IOException;
024
025/**
026 * The Class RequireFilesExist.
027 */
028public class RequireFilesExist
029    extends AbstractRequireFiles
030{
031    @Override
032    boolean checkFile( File file )
033    {
034        // if we get here and the handle is null, treat it as a success
035        return file == null ? true : file.exists() && osIndependentNameMatch( file, true );
036    }
037
038    @Override
039    String getErrorMsg()
040    {
041        return "Some required files are missing:" + System.lineSeparator();
042    }
043
044    /**
045     * OSes like Windows are case insensitive, so this method will compare the file path with the actual path. A simple
046     * {@link File#exists()} is not enough for such OS.
047     * 
048     * @param file the file to verify
049     * @param defaultValue value to return in case an IO exception occurs, should never happen as the file already
050     *            exists
051     * @return
052     */
053    private boolean osIndependentNameMatch( File file, boolean defaultValue )
054    {
055        try
056        {
057            File absFile;
058            if ( !file.isAbsolute() )
059            {
060                absFile = new File( new File( "." ).getCanonicalFile(), file.getPath() );
061            }
062            else
063            {
064                absFile = file;
065            }
066
067            return absFile.toURI().equals( absFile.getCanonicalFile().toURI() );
068        }
069        catch ( IOException e )
070        {
071            return defaultValue;
072        }
073    }
074}