com.khs.sherpa.processor.RestfulRequestProcessor.java Source code

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Here is the source code for com.khs.sherpa.processor.RestfulRequestProcessor.java

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package com.khs.sherpa.processor;

/*
 * Copyright 2012 the original author or authors.
 *
 * 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.
 */

import java.lang.reflect.Method;
import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang3.StringUtils;
import org.reflections.ReflectionUtils;
import org.reflections.Reflections;

import com.google.common.base.Predicates;
import com.khs.sherpa.annotation.Action;
import com.khs.sherpa.annotation.Endpoint;
import com.khs.sherpa.context.ApplicationContext;
import com.khs.sherpa.exception.SherpaEndpointNotFoundException;
import com.khs.sherpa.util.MethodUtil;
import com.khs.sherpa.util.SherpaPredicates;
import com.khs.sherpa.util.UrlUtil;

public class RestfulRequestProcessor implements RequestProcessor {

    private ApplicationContext applicationContext;
    private Method method;
    private String path;

    public RestfulRequestProcessor() {
    }

    public RestfulRequestProcessor(ApplicationContext applicationContext) {
        this.applicationContext = applicationContext;
    }

    public String getEndpoint(HttpServletRequest request) {
        Map<String, Object> map = applicationContext.getEndpointTypes();
        Collection<Method> methods = new HashSet<Method>();

        for (Entry<String, Object> entry : map.entrySet()) {
            Collection<Method> m = Reflections.getAllMethods(entry.getValue().getClass(),
                    Predicates.and(ReflectionUtils.withAnnotation(Action.class),
                            SherpaPredicates.withActionMappingPattern(UrlUtil.getPath(request))));
            methods.addAll(m);
        }

        method = MethodUtil.validateHttpMethods(methods.toArray(new Method[] {}), request.getMethod());
        if (method != null) {
            Class<?> type = method.getDeclaringClass();
            if (type.isAnnotationPresent(Endpoint.class)) {
                if (StringUtils.isNotEmpty(type.getAnnotation(Endpoint.class).value())) {
                    return type.getAnnotation(Endpoint.class).value();
                }
            }
            return type.getSimpleName();
        }
        throw new SherpaEndpointNotFoundException("no endpoint for url [" + UrlUtil.getPath(request) + "]");
    }

    public String getAction(HttpServletRequest request) {
        final Pattern pattern = Pattern.compile("\\{\\d?\\w+\\}");

        Matcher matcher = null;
        if (method.isAnnotationPresent(Action.class)) {
            for (String url : method.getAnnotation(Action.class).mapping()) {
                matcher = pattern.matcher(url);
                if (Pattern.matches(matcher.replaceAll("[^/]*"), UrlUtil.getPath(request))) {
                    path = url;
                }
            }
        }
        return MethodUtil.getMethodName(method);
    }

    public String getParmeter(HttpServletRequest request, String value) {
        String currentUrl = UrlUtil.getPath(request);
        Pattern pattern = Pattern.compile("(\\{\\w+\\})");
        Matcher matcher = pattern.matcher(path);
        int cnt = 0;
        while (matcher.find()) {
            if (matcher.group().equals("{" + value + "}")) {
                String matcherText = matcher.replaceAll("([^/]*)");
                pattern = Pattern.compile(matcherText);
                matcher = pattern.matcher(currentUrl);
                matcher.find();
                return matcher.group(cnt + 1);
            }
            cnt++;
        }
        return null;
    }

    public void setApplicationContext(ApplicationContext applicationContext) {
        this.applicationContext = applicationContext;
    }
}