io.knotx.adapter.common.placeholders.SlingUriInfoHelper.java Source code

Introduction

Here is the source code for io.knotx.adapter.common.placeholders.SlingUriInfoHelper.java

Source

/*
 * Copyright (C) 2016 Cognifide Limited
 *
 * 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 io.knotx.adapter.common.placeholders;

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.lang3.StringUtils;

public final class SlingUriInfoHelper {

    /**
     * This regular expression is used to decompose a sling format uri into following parts:
     * <p>
     * <ul>
     * <li>path</li>
     * <li>selector string</li>
     * <li>extension</li>
     * <li>suffix</li>
     * </ul>
     * <p>
     */
    private static final Pattern URI_PATTERN = Pattern
            .compile("([^\\.\\?#]+)(\\.([^\\/\\?#]+)\\.)?(\\.?([^\\/\\?#]+))?([^\\?#]+)?((\\?|#).+)?");

    private static final Map<String, SlingUriInfo> cache = new HashMap<>();

    private SlingUriInfoHelper() {
        // util
    }

    public static SlingUriInfo getUriInfo(String uri) {
        if (!cache.containsKey(uri)) {
            cache.put(uri, generateSlingUriInfo(uri));
        }
        return cache.get(uri);
    }

    private static SlingUriInfo generateSlingUriInfo(String uri) {
        final Matcher matcher = URI_PATTERN.matcher(uri);
        SlingUriInfo uriInfo = null;
        if (matcher.matches()) {
            String path = matcher.group(1);
            String[] pathParts = StringUtils.length(path) > 1 ? path.substring(1).split("/")
                    : new String[] { path };

            String selectorString = matcher.group(3);
            String[] selectors = selectorString != null ? selectorString.split("\\.") : new String[0];

            String extension = matcher.group(5);
            String suffix = matcher.group(6);

            uriInfo = new SlingUriInfo(path, pathParts, selectorString, selectors, extension, suffix);
        }
        return uriInfo;
    }

}