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Commons IO example source code file (IOCase.java)

This example Commons IO source code file (IOCase.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons IO tags/keywords

insensitive, invalid, io, iocase, iocase, nullpointerexception, object, override, sensitive, string, string, system, system, the, the

The Commons IO IOCase.java source code

/*
 * 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 org.apache.commons.io;

import java.io.Serializable;

/**
 * Enumeration of IO case sensitivity.
 * <p>
 * Different filing systems have different rules for case-sensitivity.
 * Windows is case-insensitive, Unix is case-sensitive.
 * <p>
 * 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.
 * <p>
 * Wherever possible, you should use the <code>check methods in this
 * class to compare filenames.
 *
 * @author Stephen Colebourne
 * @version $Id: IOCase.java 1003647 2010-10-01 20:53:59Z niallp $
 * @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.
     * <p>
     * <strong>Note: This only caters for Windows and Unix. Other operating
     * systems (e.g. OSX and OpenVMS) are treated as case sensitive if they use the
     * Unix file separator and case-insensitive if they use the Windows file separator
     * (see {@link java.io.File#separatorChar}).
     * <p>
     * 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.
     * <p>
     * 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.
     * <p>
     * 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.
     * <p>
     * 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.
     * <p>
     * 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 starting at a specific index using the
     * case-sensitivity rule.
     * <p>
     * This method mimics parts of {@link String#indexOf(String, 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 the first index of the search String,
     *  -1 if no match or <code>null string input
     * @throws NullPointerException if either string is null
     * @since Commons IO 2.0
     */
    public int checkIndexOf(String str, int strStartIndex, String search) {
        int endIndex = str.length() - search.length();
        if (endIndex >= strStartIndex) {
            for (int i = strStartIndex; i <= endIndex; i++) {
                if (checkRegionMatches(str, i, search)) {
                    return i;
                }
            }
        }
        return -1;
    }

    /**
     * Checks if one string contains another at a specific index using the case-sensitivity rule.
     * <p>
     * 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());
    }

    //-----------------------------------------------------------------------
    /**
     * Gets a string describing the sensitivity.
     * 
     * @return a string describing the sensitivity
     */
    @Override
    public String toString() {
        return name;
    }

}

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