net.hillsdon.reviki.web.vcintegration.AutoProperiesFromConfigPage.java Source code

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Here is the source code for net.hillsdon.reviki.web.vcintegration.AutoProperiesFromConfigPage.java

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/**
 * Copyright 2008 Matthew Hillsdon
 *
 * 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 net.hillsdon.reviki.web.vcintegration;

import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;

import net.hillsdon.reviki.vc.AutoProperties;
import net.hillsdon.reviki.vc.VersionedPageInfo;
import net.hillsdon.reviki.vc.PageStoreException;
import net.hillsdon.reviki.vc.impl.CachingPageStore;
import net.hillsdon.reviki.vc.impl.SimplePageStore;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import static net.hillsdon.reviki.web.vcintegration.BuiltInPageReferences.CONFIG_AUTO_PROPERTIES;

/**
 * Currently we re-parse all the while (but use the caching page store).
 * 
 * @author mth
 */
public class AutoProperiesFromConfigPage implements AutoProperties {

    private static final Log LOG = LogFactory.getLog(AutoProperiesFromConfigPage.class);

    // Currently initialized by setter injection, safe default here.
    private CachingPageStore _store = new SimplePageStore();

    public Map<String, String> read() {
        try {
            VersionedPageInfo text = _store.get(CONFIG_AUTO_PROPERTIES, -1);
            return parseAutoProperties(text.getContent());
        } catch (PageStoreException e) {
            LOG.warn("Failed to retrieve the auto-properties page.", e);
            return Collections.emptyMap();
        }
    }

    private Map<String, String> parseAutoProperties(final String content) {
        final Map<String, String> properties = new LinkedHashMap<String, String>();
        for (String line : content.split("\n")) {
            line = line.trim();
            if (line.startsWith("#")) {
                continue;
            }
            int equals = line.indexOf('=');
            if (equals != -1) {
                String before = line.substring(0, equals).trim();
                String after = line.substring(equals + 1).trim();
                properties.put(before, after);
            }
        }
        return properties;
    }

    public void setPageStore(CachingPageStore pageStore) {
        _store = pageStore;
    }

}