org.gatherdata.archiver.dao.vfs.internal.VfsArchiverDao.java Source code

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Here is the source code for org.gatherdata.archiver.dao.vfs.internal.VfsArchiverDao.java

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/**
 * The contents of this file are subject to the AED Public Use License Agreement, Version 1.0 (the "License");
 * use in any manner is strictly prohibited except in compliance with the terms of the License.
 * The License is available at http://gatherdata.org/license.
 *
 * Copyright (c) AED.  All Rights Reserved
 */
package org.gatherdata.archiver.dao.vfs.internal;

import java.io.Serializable;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang.NotImplementedException;
import org.apache.commons.lang.SerializationUtils;
import org.apache.commons.lang.StringEscapeUtils;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.FileSystemManager;
import org.apache.commons.vfs.impl.StandardFileSystemManager;
import org.gatherdata.archiver.core.model.GatherArchive;
import org.gatherdata.archiver.core.spi.ArchiverDao;

/**
 * An ArchiverDao which uses Apache Commons VFS to store
 * serialized objects on a file system.
 * 
 */
public class VfsArchiverDao implements ArchiverDao {
    private FileSystemManager fsManager;
    private FileObject fsBase;

    public VfsArchiverDao() {
        fsManager = new StandardFileSystemManager();
        try {
            fsBase = fsManager.getBaseFile();
        } catch (FileSystemException e) {
            e.printStackTrace();
        }
    }

    public boolean exists(URI uid) {
        boolean fileExists = false;
        try {
            FileObject envelopeFile = fsManager.resolveFile(fsBase, uid.toASCIIString());
            fileExists = envelopeFile.exists();
        } catch (FileSystemException e) {
            e.printStackTrace();
        }
        return fileExists;
    }

    public GatherArchive retrieveEnvelope(URI uid) {
        GatherArchive foundEnvelope = null;
        try {
            FileObject envelopeFile = fsManager.resolveFile(fsBase, uid.toASCIIString());
            if (envelopeFile.exists()) {
                foundEnvelope = (GatherArchive) SerializationUtils
                        .deserialize(envelopeFile.getContent().getInputStream());
            }
        } catch (FileSystemException e) {
            e.printStackTrace();
        }
        return foundEnvelope;
    }

    public List<GatherArchive> getAll() {
        List<GatherArchive> allEnvelopes = new ArrayList<GatherArchive>();
        try {
            for (FileObject envelopeFile : fsBase.getChildren()) {
                allEnvelopes.add(
                        (GatherArchive) SerializationUtils.deserialize(envelopeFile.getContent().getInputStream()));
            }
        } catch (FileSystemException e) {
            e.printStackTrace();
        }
        return allEnvelopes;
    }

    public int getCount() {
        try {
            return fsBase.getChildren().length;
        } catch (FileSystemException e) {
            e.printStackTrace();
        }
        return -1;
    }

    public void remove(URI uid) {
        try {
            FileObject envelopeFile = fsManager.resolveFile(fsBase, uid.toASCIIString());
            if (envelopeFile.exists()) {
                envelopeFile.delete();
            }
        } catch (FileSystemException e) {
            e.printStackTrace();
        }
    }

    public GatherArchive save(GatherArchive envelopeToSave) {
        try {
            FileObject envelopeFile = fsManager.resolveFile(fsBase, envelopeToSave.getUid().toASCIIString());
            if (envelopeFile.exists()) {
                envelopeFile.delete();
            }
            envelopeFile.createFile();
            SerializationUtils.serialize(envelopeToSave, envelopeFile.getContent().getOutputStream());
        } catch (FileSystemException e) {
            e.printStackTrace();
        }

        return envelopeToSave;
    }

    public GatherArchive get(URI arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    public void beginTransaction() {
        // ABKTODO: no-op? file lock of some kind?

    }

    public void endTransaction() {
        // ABKTODO: no-op? file lock of some kind?

    }

}