org.glassfish.hk2.utilities.reflection.Pretty Maven / Gradle / Ivy
/*
* Copyright (c) 2012, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.hk2.utilities.reflection;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Collection;
/**
* @author jwells
*
*/
public class Pretty {
private static final String DOT = ".";
private static final String NULL_STRING = "null";
/**
* Makes a nice, pretty class (without the package name)
*
* @param clazz Make me a pretty class
* @return A nice string of the class, with no package
*/
public static String clazz(Class clazz) {
if (clazz == null) return NULL_STRING;
String cn = clazz.getName();
int index = cn.lastIndexOf(DOT);
if (index < 0) return cn;
// If this fails, the class name somehow ends in dot, which should be illegal
return cn.substring(index + 1);
}
/**
* Prints a pretty parameterized type
*
* @param pType The parameterized type to print. May not be null
* @return A pretty string version of the parameterized type
*/
public static String pType(ParameterizedType pType) {
StringBuffer sb = new StringBuffer();
sb.append(clazz(ReflectionHelper.getRawClass(pType)) + "<");
boolean first = true;
for (Type t : pType.getActualTypeArguments()) {
if (first) {
first = false;
sb.append(type(t));
}
else {
sb.append("," + type(t));
}
}
sb.append(">");
return sb.toString();
}
/**
* Returns a pretty string for the given type
* @param t A possibly null type
* @return A pretty string representing the type
*/
public static String type(Type t) {
if (t == null) return NULL_STRING;
if (t instanceof Class) {
return clazz((Class) t);
}
if (t instanceof ParameterizedType) {
return pType((ParameterizedType) t);
}
return t.toString();
}
private final static String CONSTRUCTOR_NAME = "";
/**
* Make a nice pretty string out of the constructor and all its
* parameters
*
* @param constructor The constructor to make pretty
* @return A nice pretty string
*/
public static String constructor(Constructor constructor) {
if (constructor == null) return NULL_STRING;
return CONSTRUCTOR_NAME + prettyPrintParameters(constructor.getParameterTypes());
}
/**
* Makes a nice pretty string of the method, with the method name
* and all parameters
*
* @param method The method to make pretty
* @return A nice pretty string
*/
public static String method(Method method) {
if (method == null) return NULL_STRING;
return method.getName() + prettyPrintParameters(method.getParameterTypes());
}
/**
* Returns a pretty string representing a Field
* @param field The possibly null field
* @return A pretty string representing the field
*/
public static String field(Field field) {
if (field == null) return NULL_STRING;
Type t = field.getGenericType();
String baseString;
if (t instanceof Class) {
baseString = clazz((Class) t);
}
else {
baseString = type(t);
}
return "field(" + baseString + " " + field.getName() + " in " + field.getDeclaringClass().getName() + ")";
}
/**
* Returns a pretty string for the given array
* @param array The possibly null array to represent
* @return A pretty string representation of the array
*/
public static String array(Object[] array) {
if (array == null) return NULL_STRING;
StringBuffer sb = new StringBuffer("{");
boolean first = true;
for (Object item : array) {
if (item != null && (item instanceof Class)) {
item = Pretty.clazz((Class) item);
}
if (first) {
first = false;
sb.append((item == null) ? "null" : item.toString());
}
else {
sb.append("," + ((item == null) ? "null" : item.toString()));
}
}
sb.append("}");
return sb.toString();
}
/**
* Returns a pretty string representing the collection
* @param collection A possibly null collection to represent
* @return A pretty string representing the collection
*/
public static String collection(Collection collection) {
if (collection == null) return NULL_STRING;
return array(collection.toArray(new Object[collection.size()]));
}
private static String prettyPrintParameters(Class params[]) {
if (params == null) return NULL_STRING;
StringBuffer sb = new StringBuffer("(");
boolean first = true;
for (Class param : params) {
if (first) {
sb.append(clazz(param));
first = false;
}
else {
sb.append("," + clazz(param));
}
}
sb.append(")");
return sb.toString();
}
}