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/*
 * 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.
 */
package ngmf.util;

import java.io.Serializable;

/**
 * Enumeration of IO case sensitivity.
 * 

* Different filing systems have different rules for case-sensitivity. * Windows is case-insensitive, Unix is case-sensitive. *

* This class captures that difference, providing an enumeration to * control how filename comparisons should be performed. It also provides * methods that use the enumeration to perform comparisons. *

* Wherever possible, you should use the check methods in this * class to compare filenames. * * @author Stephen Colebourne * @version $Id$ * @since Commons IO 1.3 */ public final class IOCase implements Serializable { /** * The constant for case sensitive regardless of operating system. */ public static final IOCase SENSITIVE = new IOCase("Sensitive", true); /** * The constant for case insensitive regardless of operating system. */ public static final IOCase INSENSITIVE = new IOCase("Insensitive", false); /** * The constant for case sensitivity determined by the current operating system. * Windows is case-insensitive when comparing filenames, Unix is case-sensitive. *

* If you derialize this constant of Windows, and deserialize on Unix, or vice * versa, then the value of the case-sensitivity flag will change. */ public static final IOCase SYSTEM = new IOCase("System", !FilenameUtils.isSystemWindows()); /** Serialization version. */ private static final long serialVersionUID = -6343169151696340687L; /** The enumeration name. */ private final String name; /** The sensitivity flag. */ private final transient boolean sensitive; //----------------------------------------------------------------------- /** * Factory method to create an IOCase from a name. * * @param name the name to find * @return the IOCase object * @throws IllegalArgumentException if the name is invalid */ public static IOCase forName(String name) { if (IOCase.SENSITIVE.name.equals(name)){ return IOCase.SENSITIVE; } if (IOCase.INSENSITIVE.name.equals(name)){ return IOCase.INSENSITIVE; } if (IOCase.SYSTEM.name.equals(name)){ return IOCase.SYSTEM; } throw new IllegalArgumentException("Invalid IOCase name: " + name); } //----------------------------------------------------------------------- /** * Private constructor. * * @param name the name * @param sensitive the sensitivity */ private IOCase(String name, boolean sensitive) { this.name = name; this.sensitive = sensitive; } /** * Replaces the enumeration from the stream with a real one. * This ensures that the correct flag is set for SYSTEM. * * @return the resolved object */ private Object readResolve() { return forName(name); } //----------------------------------------------------------------------- /** * Gets the name of the constant. * * @return the name of the constant */ public String getName() { return name; } /** * Does the object represent case sensitive comparison. * * @return true if case sensitive */ public boolean isCaseSensitive() { return sensitive; } //----------------------------------------------------------------------- /** * Compares two strings using the case-sensitivity rule. *

* This method mimics {@link String#compareTo} but takes case-sensitivity * into account. * * @param str1 the first string to compare, not null * @param str2 the second string to compare, not null * @return true if equal using the case rules * @throws NullPointerException if either string is null */ public int checkCompareTo(String str1, String str2) { if (str1 == null || str2 == null) { throw new NullPointerException("The strings must not be null"); } return sensitive ? str1.compareTo(str2) : str1.compareToIgnoreCase(str2); } /** * Compares two strings using the case-sensitivity rule. *

* This method mimics {@link String#equals} but takes case-sensitivity * into account. * * @param str1 the first string to compare, not null * @param str2 the second string to compare, not null * @return true if equal using the case rules * @throws NullPointerException if either string is null */ public boolean checkEquals(String str1, String str2) { if (str1 == null || str2 == null) { throw new NullPointerException("The strings must not be null"); } return sensitive ? str1.equals(str2) : str1.equalsIgnoreCase(str2); } /** * Checks if one string starts with another using the case-sensitivity rule. *

* This method mimics {@link String#startsWith(String)} but takes case-sensitivity * into account. * * @param str the string to check, not null * @param start the start to compare against, not null * @return true if equal using the case rules * @throws NullPointerException if either string is null */ public boolean checkStartsWith(String str, String start) { return str.regionMatches(!sensitive, 0, start, 0, start.length()); } /** * Checks if one string ends with another using the case-sensitivity rule. *

* This method mimics {@link String#endsWith} but takes case-sensitivity * into account. * * @param str the string to check, not null * @param end the end to compare against, not null * @return true if equal using the case rules * @throws NullPointerException if either string is null */ public boolean checkEndsWith(String str, String end) { int endLen = end.length(); return str.regionMatches(!sensitive, str.length() - endLen, end, 0, endLen); } /** * Checks if one string contains another at a specific index using the case-sensitivity rule. *

* This method mimics parts of {@link String#regionMatches(boolean, int, String, int, int)} * but takes case-sensitivity into account. * * @param str the string to check, not null * @param strStartIndex the index to start at in str * @param search the start to search for, not null * @return true if equal using the case rules * @throws NullPointerException if either string is null */ public boolean checkRegionMatches(String str, int strStartIndex, String search) { return str.regionMatches(!sensitive, strStartIndex, search, 0, search.length()); } /** * Converts the case of the input String to a standard format. * Subsequent operations can then use standard String methods. * * @param str the string to convert, null returns null * @return the lower-case version if case-insensitive */ String convertCase(String str) { if (str == null) { return null; } return sensitive ? str : str.toLowerCase(); } //----------------------------------------------------------------------- /** * Gets a string describing the sensitivity. * * @return a string describing the sensitivity */ public String toString() { return name; } }





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