com.google.gwt.uibinder.attributeparsers.CssNameConverter Maven / Gradle / Ivy
/*
* Copyright 2009 Google Inc.
*
* Licensed 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 com.google.gwt.uibinder.attributeparsers;
import java.util.LinkedHashMap;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
/**
* Converts css class names to a form safe to use as a Java identifier.
*/
public class CssNameConverter {
/**
* Thrown by {@link CssNameConverter#convertSet(Set)} on name collision.
*/
public static class Failure extends Exception {
Failure(String message, Object... params) {
super(String.format(message, params));
}
}
/**
* @param className a css class name
* @return the same name in a form safe to use as a Java identifier
*/
public String convertName(String className) {
String[] bits = className.split("\\-");
StringBuilder b = new StringBuilder();
for (String bit : bits) {
if (b.length() == 0) {
b.append(bit);
} else {
b.append(bit.substring(0, 1).toUpperCase(Locale.ROOT));
if (bit.length() > 1) {
b.append(bit.substring(1));
}
}
}
String converted = b.toString();
return converted;
}
/**
* @param classNames css class names to convert
* @return map of the same class names in a form safe for use as Java
* identifiers, with the order of the input set preserved
* @throws Failure on collisions due to conversions
*/
public Map convertSet(Set classNames) throws Failure {
Map rawToConverted = new LinkedHashMap();
Map convertedToRaw = new LinkedHashMap();
for (String className : classNames) {
String converted = convertName(className);
String already = convertedToRaw.get(converted);
if (already != null) {
throw new Failure("CSS class name collision: \"%s\" and \"%s\"",
already, className);
}
convertedToRaw.put(converted, className);
rawToConverted.put(className, converted);
}
return rawToConverted;
}
}