/*
* Copyright 2012 Denis Neuling
*
* 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.apitrary.api.client.util;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.apitrary.api.annotation.Default;
import com.apitrary.api.annotation.Path;
import com.apitrary.api.annotation.PathVariable;
import com.apitrary.api.request.Request;
/**
* <p>
* PathUtil class.
* </p>
*
* @author Denis Neuling (denisneuling@gmail.com)
*
*/
public class PathUtil {
private static final String PATTERN = "\\$\\{(.*?)*\\}(.*?)";
/**
* <p>
* resolveResourcePath.
* </p>
*
* @param request
* a {@link com.apitrary.api.request.Request} object.
* @param <T>
* a T object.
* @return a {@link java.lang.String} object.
*/
public static <T> String resolveResourcePath(Request<T> request) {
infixPotentialPathDefaults(request, request.getClass());
Class<?> clazz = request.getClass();
String unresolvedPath = ClassUtil.getClassAnnotationValue(clazz, Path.class, "value", String.class);
Map<String, String> patternMap = new HashMap<String, String>();
for (Field field : clazz.getDeclaredFields()) {
PathVariable part = field.getAnnotation(PathVariable.class);
if (part != null) {
try {
String pattern = part.value();
field.setAccessible(true);
String value = (String) field.get(request);
patternMap.put(pattern, value);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
Pattern pattern = Pattern.compile(PATTERN);
Matcher matcher = pattern.matcher(unresolvedPath);
LinkedHashSet<String> placeholder = new LinkedHashSet<String>();
while (matcher.find()) {
placeholder.add(matcher.group());
}
for (String key : placeholder) {
String found = patternMap.get(key);
if (found != null) {
unresolvedPath = unresolvedPath.replace((String) key, found);
}
}
if (unresolvedPath.endsWith("/")) {
unresolvedPath = unresolvedPath.substring(0, unresolvedPath.length() - 1);
}
return unresolvedPath;
}
private static <T> void infixPotentialPathDefaults(Request<T> request, Class<?> targetClazz) {
if (targetClazz == null) {
targetClazz = request.getClass();
}
Class<?> superClass = targetClazz.getSuperclass();
if (superClass != null && superClass.equals(Request.class)) {
infixPotentialPathDefaults(request, superClass);
}
Field[] declaredFields = targetClazz.getDeclaredFields();
for (Field property : declaredFields) {
Default defaultValue = property.getAnnotation(Default.class);
if (null != defaultValue) {
property.setAccessible(true);
try {
Object value = property.get(request);
if (value == null) {
property.set(request, defaultValue.value());
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
}
}