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/****************************************************************************
* Sangria *
* Copyright (C) 2014 Tavian Barnes <tavianator@tavianator.com> *
* *
* 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.tavianator.sangria.core;
import com.google.inject.Key;
/**
* Utility class for pretty-printing messages containing types.
*
* @author Tavian Barnes (tavianator@tavianator.com)
* @version 1.0
* @since 1.0
*/
public class PrettyTypes {
private PrettyTypes() {
// Not for instantiating
}
/**
* Format a message.
*
* @param message The format string.
* @param args The format arguments, possibly containing {@link Class} or {@link Key} instances to be
* pretty-printed.
* @return A formatted message.
* @see String#format(String, Object...)
*/
public static String format(String message, Object... args) {
// This is like Guice's internal Errors.format()
Object[] prettyArgs = new Object[args.length];
for (int i = 0; i < args.length; ++i) {
Object arg = args[i];
Object prettyArg;
if (arg instanceof Class) {
prettyArg = format((Class<?>)arg);
} else if (arg instanceof Key) {
prettyArg = format((Key<?>)arg);
} else {
prettyArg = arg;
}
prettyArgs[i] = prettyArg;
}
return String.format(message, prettyArgs);
}
private static String format(Class<?> type) {
return type.getCanonicalName();
}
private static String format(Key<?> key) {
StringBuilder builder = new StringBuilder(key.getTypeLiteral().toString());
if (key.getAnnotationType() != null) {
builder.append(" annotated with ");
if (key.getAnnotation() != null) {
builder.append(key.getAnnotation());
} else {
builder.append("@")
.append(format(key.getAnnotationType()));
}
}
return builder.toString();
}
}
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