nl.toolforge.karma.core.manifest.ManifestCollector.java Source code

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Here is the source code for nl.toolforge.karma.core.manifest.ManifestCollector.java

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/*
Karma core - Core of the Karma application
Copyright (C) 2004  Toolforge <www.toolforge.nl>
    
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
    
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.
    
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
package nl.toolforge.karma.core.manifest;

import nl.toolforge.core.util.file.XMLFilenameFilter;
import nl.toolforge.karma.core.boot.WorkingContext;
import nl.toolforge.karma.core.location.LocationException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.prefs.Preferences;

/**
 * Class that collects all manifests for a <code>WorkingContext</code>.
 *
 * @author D.A. Smedes
 * @version $Id$
 */
public class ManifestCollector {

    private static Log logger = LogFactory.getLog(ManifestCollector.class);

    private Collection manifests = new ArrayList();
    private WorkingContext workingContext = null;

    public ManifestCollector(WorkingContext workingContext) {
        this.workingContext = workingContext;
    }

    /**
     * Returns a collection of manifest file names, located in the the manifest store.
     * 
     * @return
     */
    public Collection getAllManifests() {
        File manifestStore = workingContext.getConfiguration().getManifestStore().getModule().getBaseDir();

        Object[] mList = manifestStore.list(new XMLFilenameFilter());

        if (mList == null) {
            return new ArrayList();
        }
        manifests = Arrays.asList(mList);
        if (manifests.size() == 0) {
            return new ArrayList();
        }

        return manifests;
    }

    public synchronized void refresh() {
        init();
    }

    /**
     * Retrieves the last used manifest or <code>null</code> when none was found.
     *
     * @return The last used manifest.
     * @throws ManifestException When the manifest referred to by {@link Manifest.HISTORY_KEY} could not be loaded.
     */
    public Manifest loadManifestFromHistory() throws LocationException, ManifestException {

        String contextManifest = workingContext.getContextManifestPreference();

        String manifestId = Preferences.userRoot().get(contextManifest, null);
        if (manifestId != null) {

            ManifestFactory manifestFactory = new ManifestFactory();
            ManifestLoader loader = new ManifestLoader(workingContext);
            Manifest manifest = manifestFactory.create(workingContext, loader.load(manifestId));

            return manifest;
        }

        return null;
    }

    private synchronized void init() {
        manifests = new HashSet();
    }
}