de.mpg.mpdl.inge.transformation.transformations.LocalUriResolver.java Source code

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Here is the source code for de.mpg.mpdl.inge.transformation.transformations.LocalUriResolver.java

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/*
 * 
 * CDDL HEADER START
 * 
 * The contents of this file are subject to the terms of the Common Development and Distribution
 * License, Version 1.0 only (the "License"). You may not use this file except in compliance with
 * the License.
 * 
 * You can obtain a copy of the license at license/ESCIDOC.LICENSE or
 * http://www.escidoc.org/license. See the License for the specific language governing permissions
 * and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL HEADER in each file and include the License
 * file at license/ESCIDOC.LICENSE. If applicable, add the following below this CDDL HEADER, with
 * the fields enclosed by brackets "[]" replaced with your own identifying information: Portions
 * Copyright [yyyy] [name of copyright owner]
 * 
 * CDDL HEADER END
 */

/*
 * Copyright 2006-2012 Fachinformationszentrum Karlsruhe Gesellschaft fr wissenschaftlich-technische
 * Information mbH and Max-Planck- Gesellschaft zur Fderung der Wissenschaft e.V. All rights
 * reserved. Use is subject to license terms.
 */

package de.mpg.mpdl.inge.transformation.transformations;

import java.io.FileNotFoundException;
import java.io.IOException;

import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.stream.StreamSource;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.methods.GetMethod;

import de.mpg.mpdl.inge.util.ProxyHelper;
import de.mpg.mpdl.inge.util.ResourceUtil;

/**
 * This class handle URIs in XSLT stylesheets such as xsl:import. In a jar the stylesheet can only
 * be loaded as InputStream. Without this URIResolver it is not possible to work with import
 * statements.
 * 
 * @author mfranke
 * @author $Author$
 * @version $Revision$$LastChangedDate$
 */
public class LocalUriResolver implements URIResolver {

    private String base = "";

    private static final String TRANS_PATH = "transformations/";

    /**
     * Default constructor.
     */
    public LocalUriResolver() {

    }

    /**
     * Field-based constructor.
     * 
     * @param base The base URI.
     */
    public LocalUriResolver(String base) {
        this.base = base;
    }

    /**
     * {@inheritDoc}
     */
    public final Source resolve(String href, String altBase) throws TransformerException {

        String path = null;

        if (altBase == null) {
            altBase = "";
        }

        try {

            if ("ves-mapping.xml".equals(href) || "vocabulary-mappings.xsl".equals(href)) {
                path = TRANS_PATH + href;
            } else if (href != null && href.matches("^https?://.*")) {
                HttpClient client = new HttpClient();
                GetMethod getMethod = new GetMethod(href);
                ProxyHelper.executeMethod(client, getMethod);
                return new StreamSource(getMethod.getResponseBodyAsStream());
            } else {
                path = this.base + altBase + "/" + href;
            }

            return new StreamSource(
                    ResourceUtil.getResourceAsStream(path, LocalUriResolver.class.getClassLoader()));
        } catch (FileNotFoundException e) {
            // throw new TransformerException("Cannot resolve URI: " + href);
            throw new TransformerException("Cannot resolve URI: " + path, e);
        } catch (HttpException e) {
            throw new TransformerException("Cannot connect to URI: " + path, e);
        } catch (IOException e) {
            throw new TransformerException("Cannot get content from URI: " + path, e);
        }
    }
}