Perform file prefix substitution. - Java java.io

Java examples for java.io:File Name

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Description

Perform file prefix substitution.

Demo Code

/* Utilities used to manipulate strings.

 Copyright (c) 2002-2006 The Regents of the University of California.
 All rights reserved.//  w w  w .ja  v a2 s  .co m
 Permission is hereby granted, without written agreement and without
 license or royalty fees, to use, copy, modify, and distribute this
 software and its documentation for any purpose, provided that the above
 copyright notice and the following two paragraphs appear in all copies
 of this software.

 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
 FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
 PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
 CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
 ENHANCEMENTS, OR MODIFICATIONS.

 PT_COPYRIGHT_VERSION_2
 COPYRIGHTENDKEY

 */
//package com.java2s;
import java.io.File;

public class Main {
    public static void main(String[] argv) {
        String prefix = "java2s.com";
        String string = "java2s.com";
        String replacement = "java2s.com";
        System.out
                .println(substituteFilePrefix(prefix, string, replacement));
    }

    /** Perform file prefix substitution.
     *  If <i>string</i> starts with <i>prefix</i>, then we return a
     *  new string that consists of the value or <i>replacement</i>
     *  followed by the value of <i>string</i> with the value of
     *  <i>prefix</i> removed.  For example,
     *  substituteFilePrefix("c:/ptII", "c:/ptII/ptolemy, "$PTII")
     *  will return "$PTII/ptolemy"
     *
     *  <p>If <i>prefix</i> is not a simple prefix of <i>string</i>, then
     *  we use the file system to find the canonical names of the files.
     *  For this to work, <i>prefix</i> and <i>string</i> should name
     *  files that exist, see java.io.File.getCanonicalFile() for details.
     *
     *  <p>If <i>prefix</i> is not a prefix of <i>string</i>, then
     *  we return <i>string</i>
     *
     *  @param prefix The prefix string, for example, "c:/ptII".
     *  @param string The string to be substituted, for example,
     *  "c:/ptII/ptolemy".
     *  @param replacement The replacement to be substituted in, for example,
     *  "$PTII"
     *  @return The possibly substituted string.
     */
    public static String substituteFilePrefix(String prefix, String string,
            String replacement) {
        // This method is currently used by $PTII/util/testsuite/auto.tcl
        if (string.startsWith(prefix)) {
            // Hmm, what about file separators?
            return replacement + string.substring(prefix.length());
        } else {
            try {
                String prefixCanonicalPath = (new File(prefix))
                        .getCanonicalPath();

                String stringCanonicalPath = (new File(string))
                        .getCanonicalPath();

                if (stringCanonicalPath.startsWith(prefixCanonicalPath)) {
                    return replacement
                            + stringCanonicalPath
                                    .substring(prefixCanonicalPath.length());
                }
            } catch (Throwable throwable) {
                // ignore.
            }
        }

        return string;
    }
}

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