blob: ae83346a265ffd418b7f219d7272b64597df73f4 [file] [log] [blame]
/*
* 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.guacamole.token;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Utility class for generating parameter token names.
*/
public class TokenName {
/**
* Pattern which matches logical groupings of words within a
* string. This pattern is intended to match logical groupings
* regardless of the naming convention used: "CamelCase",
* "headlessCamelCase", "lowercase_with_underscores",
* "lowercase-with-dashes" or even "aVery-INCONSISTENTMix_ofAllStyles".
*/
private static final Pattern STRING_NAME_GROUPING = Pattern.compile(
// "Camel" word groups
"\\p{javaUpperCase}\\p{javaLowerCase}+"
// Groups of digits
+ "|[0-9]+"
// Groups of uppercase letters, excluding the uppercase letter
// which begins a following "Camel" group
+ "|\\p{javaUpperCase}+(?!\\p{javaLowerCase})"
// Groups of lowercase letters which match no other pattern
+ "|\\p{javaLowerCase}+"
// Groups of word characters letters which match no other pattern
+ "|\\b\\w+\\b"
);
/**
* This utility class should not be instantiated.
*/
private TokenName() {}
/**
* Generates the name of the parameter token that should be populated with
* the given string. The provided string will be automatically transformed
* from "CamelCase", "headlessCamelCase", "lowercase_with_underscores",
* and "mixes_ofBoth_Styles" to consistent "UPPERCASE_WITH_UNDERSCORES".
* Each returned token name will be prefixed with the string value provided
* in the prefix. The value provided in prefix will be prepended to the
* string, but will itself not be transformed.
*
* @param name
* The string to be used to generate the token name.
*
* @param prefix
* The prefix to prepend to the generated token name.
*
* @return
* The name of the parameter token that should be populated with the
* given string.
*/
public static String canonicalize(final String name, final String prefix) {
// If even one logical word grouping cannot be found, default to
// simply converting the string to uppercase and adding the
// prefix
Matcher groupMatcher = STRING_NAME_GROUPING.matcher(name);
if (!groupMatcher.find())
return prefix + name.toUpperCase();
// Split the given name into logical word groups, separated by
// underscores and converted to uppercase
StringBuilder builder = new StringBuilder(prefix);
builder.append(groupMatcher.group(0).toUpperCase());
while (groupMatcher.find()) {
builder.append("_");
builder.append(groupMatcher.group(0).toUpperCase());
}
return builder.toString();
}
/**
* Generate the name of a parameter token from the given string, with no
* added prefix, such that the token name will simply be the transformed
* version of the string. See
* {@link #canonicalize(java.lang.String, java.lang.String)}
*
*
* @param name
* The string to use to generate the token name.
*
* @return
* The name of the parameter token that should be populated with the
* given string.
*/
public static String canonicalize(final String name) {
return canonicalize(name, "");
}
}