net.sf.taverna.t2.renderers.RendererUtils.java Source code

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Here is the source code for net.sf.taverna.t2.renderers.RendererUtils.java

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/*******************************************************************************
 * Copyright (C) 2013 The University of Manchester
 *
 *  Modifications to the initial code base are copyright of their
 *  respective authors, or their employers as appropriate.
 *
 *  This program 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 program 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 program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 ******************************************************************************/
package net.sf.taverna.t2.renderers;

import static org.purl.wf4ever.robundle.Bundles.getReference;
import static org.purl.wf4ever.robundle.Bundles.getStringValue;
import static org.purl.wf4ever.robundle.Bundles.isReference;
import static uk.org.taverna.databundle.DataBundles.isValue;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Path;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;

/**
 * @author David Withers
 */
public class RendererUtils {
    public static long getSizeInBytes(Path path) throws IOException {
        if (isValue(path))
            return Files.size(path);
        if (!isReference(path))
            throw new IllegalArgumentException("Path is not a value or reference");

        URL url = getReference(path).toURL();
        switch (url.getProtocol().toLowerCase()) {
        case "http":
        case "https":
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("HEAD");
            conn.connect();
            String contentLength = conn.getHeaderField("Content-Length");
            conn.disconnect();
            if (contentLength != null && !contentLength.isEmpty())
                return Long.parseLong(contentLength);
            return -1;
        case "file":
            return FileUtils.toFile(url).length();
        default:
            return -1;
        }
    }

    public static String getString(Path path) throws IOException {
        if (isValue(path))
            return getStringValue(path);
        else if (isReference(path))
            return IOUtils.toString(getReference(path));
        else
            throw new IllegalArgumentException("Path is not a value or reference");
    }

    public static InputStream getInputStream(Path path) throws MalformedURLException, IOException {
        if (isValue(path))
            return Files.newInputStream(path);
        else if (isReference(path))
            return getReference(path).toURL().openStream();
        else
            throw new IllegalArgumentException("Path is not a value or reference");
    }
}