Match SQL string
/*
*
* The ObjectStyle Group Software License, version 1.1
* ObjectStyle Group - http://objectstyle.org/
*
* Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
* of the software. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if any,
* must include the following acknowlegement:
* "This product includes software developed by independent contributors
* and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
* or promote products derived from this software without prior written
* permission. For written permission, email
* "andrus at objectstyle dot org".
*
* 5. Products derived from this software may not be called "ObjectStyle"
* or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
* names without prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE OBJECTSTYLE GROUP OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
* This software consists of voluntary contributions made by many
* individuals and hosted on ObjectStyle Group web site. For more
* information on the ObjectStyle Group, please see
* <http://objectstyle.org/>.
*/
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* A collection of utility methods related to regular expressions processing.
*
* @since 1.2
* @author Andrus Adamchik
*/
class RegexUtil {
static final Pattern BACKSLASH = Pattern.compile("\\\\");
static final Pattern DOT = Pattern.compile("\\.");
/**
* Replaces all backslashes "\" with forward slashes "/". Convenience method to
* convert path Strings to URI format.
*/
static String substBackslashes(String string) {
if (string == null) {
return null;
}
Matcher matcher = BACKSLASH.matcher(string);
return matcher.find() ? matcher.replaceAll("\\/") : string;
}
/**
* Returns package name for the Java class as a path separated with forward slash
* ("/"). Method is used to lookup resources that are located in package
* subdirectories. For example, a String "a/b/c" will be returned for class name
* "a.b.c.ClassName".
*/
static String getPackagePath(String className) {
if (className == null) {
return "";
}
Matcher matcher = DOT.matcher(className);
if (matcher.find()) {
String path = matcher.replaceAll("\\/");
return path.substring(0, path.lastIndexOf("/"));
}
else {
return "";
}
}
/**
* Converts a SQL-style pattern to a valid Perl regular expression. E.g.:
* <p>
* <code>"billing_%"</code> will become <code>^billing_.*$</code>
* <p>
* <code>"user?"</code> will become <code>^user.?$</code>
*/
static String sqlPatternToRegex(String pattern) {
if (pattern == null) {
throw new NullPointerException("Null pattern.");
}
if (pattern.length() == 0) {
throw new IllegalArgumentException("Empty pattern.");
}
StringBuffer buffer = new StringBuffer();
// convert * into regex syntax
// e.g. abc*x becomes ^abc.*x$
// or abc?x becomes ^abc.?x$
buffer.append("^");
for (int j = 0; j < pattern.length(); j++) {
char nextChar = pattern.charAt(j);
if (nextChar == '%') {
nextChar = '*';
}
if (nextChar == '*' || nextChar == '?') {
buffer.append('.');
}
// escape special chars
else if (nextChar == '.'
|| nextChar == '/'
|| nextChar == '$'
|| nextChar == '^') {
buffer.append('\\');
}
buffer.append(nextChar);
}
buffer.append("$");
return buffer.toString();
}
private RegexUtil() {
super();
}
}
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