// Copyright 2012 The Apache Software Foundation
//
// 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 org.apache.tapestry5.internal.clojure;
import clojure.lang.Symbol;
import org.apache.tapestry5.clojure.MethodToFunctionSymbolMapper;
import java.lang.reflect.Method;
import java.util.regex.MatchResult;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Default implementation that transforms a camelCased method-name to a clojure-style function name.
*/
public class DefaultMapper implements MethodToFunctionSymbolMapper
{
@Override
public Symbol mapMethod(String namespace, Method method)
{
return mapMethodName(namespace, method.getName());
}
private Symbol mapMethodName(String namespace, String name)
{
return Symbol.create(namespace, transformName(name));
}
private final Pattern transition = Pattern.compile("(\\p{Lower}\\p{Upper})");
private String transformName(String name)
{
Matcher matcher = transition.matcher(name);
StringBuilder builder = new StringBuilder();
int lastx = 0;
while (matcher.find())
{
MatchResult matchResult = matcher.toMatchResult();
int start = matchResult.start();
int end = matchResult.end();
builder.append(name.substring(lastx, start + 1));
builder.append("-");
// TODO: An acronym (such as "URL") should not be lower cased here.
builder.append(name.substring(end - 1, end).toLowerCase());
lastx = end;
}
if (lastx == 0)
{
return name;
}
builder.append(name.substring(lastx));
return builder.toString();
}
}