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Main ACS AEM Commons OSGi Bundle. Includes commons utilities.
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/*
 * #%L
 * ACS AEM Commons Bundle
 * %%
 * Copyright (C) 2016 Adobe
 * %%
 * 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.
 * #L%
 */
package com.adobe.acs.commons.wcm.impl;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;

import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.ConfigurationPolicy;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.commons.osgi.PropertiesUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Component(
        label = "ACS AEM Commons - Page Root Provider Configuration",
        description = "Configuration instance for Page Root Provider, a service to fetch the site root page for a given resource.",
        policy = ConfigurationPolicy.REQUIRE,
        metatype = true,
        configurationFactory = true
)
@Service(PageRootProviderConfig.class)
/**
 * Configuration instance for Page Root Provider.
 * Use service.ranking to guarantee priority between conflicting configurations.
 *
 * @see PageRootProviderMultiImpl
 */
public class PageRootProviderConfig {

    /* Default root. */
    static final String DEFAULT_PAGE_ROOT_PATH = "/content";

    @Property(
            label = "Root page path pattern",
            description = "Regex(es) used to select the root page root path. Regex must contain at least one group (with index 1) which is used as page root. It is matched against the given path. Evaluates list top-down; first match wins. Defaults to [ " + DEFAULT_PAGE_ROOT_PATH + " ]",
            cardinality = Integer.MAX_VALUE,
            value = { DEFAULT_PAGE_ROOT_PATH })
    /* Page root property. */
    static final String PAGE_ROOT_PATH = "page.root.path";

    private static final Logger log = LoggerFactory.getLogger(PageRootProviderConfig.class);

    private List pageRootPatterns = null;

    /**
     * Retrieves the configured patterns.
     *
     * @return list of page root patterns.
     */
    public List getPageRootPatterns() {
        return this.pageRootPatterns;
    }

    @Activate
    protected void activate(Map props) {
        List patterns = new ArrayList();
        String[] regexes = PropertiesUtil.toStringArray(props.get(PAGE_ROOT_PATH), new String[] { DEFAULT_PAGE_ROOT_PATH });

        for(String regex : regexes) {
            try {
                Pattern p = Pattern.compile("^(" + regex + ")(|/.*)$");
                patterns.add(p);
                log.debug("Added Page Root Pattern [ {} ] to PageRootProvider", p);
            } catch (Exception e) {
                log.error("Could not compile regex [ {} ] to pattern. Skipping...", regex, e);
            }
        }

        this.pageRootPatterns = Collections.unmodifiableList(patterns);
    }

    @Deactivate
    protected void deactivate() {
        if (this.pageRootPatterns != null) {
            for (Pattern p : this.pageRootPatterns) {
                log.debug("Removed Page Root Pattern [ {} ] from PageRootProvider", p);
            }

            this.pageRootPatterns = null;
        }
    }

}