org.biokoframework.http.routing.impl.RouteMatcherImpl.java Source code

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Here is the source code for org.biokoframework.http.routing.impl.RouteMatcherImpl.java

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/*
 * Copyright (c) 2014                                                 
 *   Mikol Faro         <mikol.faro@gmail.com>
 *   Simone Mangano      <simone.mangano@ieee.org>
 *   Mattia Tortorelli   <mattia.tortorelli@gmail.com>
 *
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * 
 */

package org.biokoframework.http.routing.impl;

import com.google.common.base.Objects;
import org.apache.commons.lang3.StringUtils;
import org.biokoframework.http.routing.IRoute;
import org.biokoframework.http.routing.IRouteMatcher;
import org.biokoframework.system.KILL_ME.commons.HttpMethod;
import org.biokoframework.utils.fields.Fields;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 
 * @author Mikol Faro <mikol.faro@gmail.com>
 * @date Feb 19, 2014
 *
 */
public class RouteMatcherImpl implements IRouteMatcher {

    private final HttpMethod fMethod;
    private final Pattern fParameterPattern = Pattern.compile("\\{(?:<.*>)?[a-z]+\\}");
    private final Pattern fRoutePattern;

    private final List<String> fParameterNames;

    public RouteMatcherImpl(HttpMethod method, String routePath) {
        fMethod = method;
        fParameterNames = new ArrayList<>();

        String plainPath = stripParameters(routePath);
        fRoutePattern = Pattern.compile(fixTrailingSlash(plainPath));

    }

    @Override
    public boolean matches(IRoute route) {
        if (fMethod.equals(route.getMethod())) {
            Matcher matcher = fRoutePattern.matcher(route.getPath());
            if (matcher.matches()) {
                Fields parameters = new Fields();
                int i = 1;
                for (String aParameterName : fParameterNames) {
                    String paramValue = matcher.group(i);
                    if (!paramValue.isEmpty()) {
                        parameters.put(aParameterName, paramValue);
                    }
                    i++;
                }

                route.matchedParameters(parameters);

                return true;
            }
        }
        return false;
    }

    private String fixTrailingSlash(String routePath) {
        if (routePath.endsWith("/")) {
            routePath = routePath + "?";
        } else if (routePath.endsWith("/?")) {
            return routePath;
        }
        return routePath + "/?";
    }

    private String stripParameters(String routePath) {
        Matcher matcher = fParameterPattern.matcher(routePath);
        if (matcher.find()) {
            String replacementString = extractParameter(matcher.group(0));
            routePath = routePath.replace(matcher.group(0), replacementString);
        }
        return routePath;
    }

    private String extractParameter(String group) {
        String parameterName = group.replaceAll("\\{(<.*>)?", "").replaceAll("\\}", "");
        fParameterNames.add(parameterName);
        String paramRegexp = group.replaceAll("\\{<?", "").replaceAll(">?" + parameterName + "\\}", "");
        return "(" + StringUtils.defaultIfEmpty(paramRegexp, "[^\\{\\}/\\.]*") + ")";
    }

    @Override
    public String toString() {
        return Objects.toStringHelper(RouteMatcherImpl.class).add("method", fMethod)
                .add("routePattern", fRoutePattern).add("parameterPatterns", fParameterPattern).toString();
    }
}