jjj.asap.sas.util.Bucket.java Source code

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Here is the source code for jjj.asap.sas.util.Bucket.java

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/*
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or GITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * Copyright (C) 2012 James Jesensky
 */

package jjj.asap.sas.util;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

import weka.core.Instances;

/**
 * Helper class for working with buckets
 */
public class Bucket {

    /**
     * Adds an arbitrary item to a bucket
     */
    public static void add(final String bucketType, final String bucketName, final String itemName,
            final String itemContents) {
        final String name = "buckets/" + bucketType + "/" + bucketName + "/" + itemName;
        try {
            PrintWriter writer = new PrintWriter(name);
            writer.println(itemContents);
            writer.flush();
            writer.close();

        } catch (IOException e) {
            throw new RuntimeException(name, e);
        }
    }

    /**
     * Adds a dataset to a bucket. The relName is the item name.
     */
    public static void add(final Instances dataset, final String bucketName) {

        try {

            PrintWriter writer = new PrintWriter("buckets/datasets/" + bucketName + "/" + dataset.relationName());
            writer.println(dataset.numAttributes());
            writer.flush();
            writer.close();

        } catch (IOException e) {
            throw new RuntimeException(dataset.relationName(), e);
        }
    }

    /**
     * Returns the name of all items in a bucket
     */
    public static List<String> getBucketItems(final String bucketType, final String bucketName) {

        List<String> items = new ArrayList<String>();

        final File bucket = new File("buckets/" + bucketType + "/" + bucketName);
        File[] files = bucket.listFiles();
        if (files != null) {
            for (File file : files) {
                if (!file.isDirectory()) {
                    items.add(file.getName());
                }
            }
        }

        return items;
    }

    /**
     * @return true if this looks like a valid bucket
     */
    public static boolean isBucket(final String bucketType, final String bucketName) {
        final File bucket = new File("buckets/" + bucketType + "/" + bucketName);
        return bucket.exists() && bucket.isDirectory();
    }

}