org.clazzes.odtransform.ZipFileURIResolver.java Source code

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Here is the source code for org.clazzes.odtransform.ZipFileURIResolver.java

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/***********************************************************
 * $Id: ZipFileURIResolver.java,v 1.1 2008/08/05 10:03:24 jwolz Exp $
 * 
 * OpenDocument transformation tool of the clazzes.org project
 * http://www.clazzes.org
 *
 * Copyright (C) 2006-2007 ev-i Informationstechnologie GmbH
 *
 * Created: 2006-12-18
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 ***********************************************************/

package org.clazzes.odtransform;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

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.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * An implementation of URIResolver, which resolves zip entries with in a supplied ZipFile.
 * 
 * @author wglas
 */
public class ZipFileURIResolver implements URIResolver {
    private static Log log = LogFactory.getLog(ZipFileURIResolver.class);

    private ZipFile zipFile;

    /**
     * @param zipFile
     */
    public ZipFileURIResolver(ZipFile zipFile) {
        this.zipFile = zipFile;
    }

    /* (non-Javadoc)
     * @see javax.xml.transform.URIResolver#resolve(java.lang.String, java.lang.String)
     */
    public Source resolve(String href, String base) throws TransformerException {
        try {
            URI uri = new URI(href);

            if (uri.isAbsolute())
                return null;

            log.debug("Resolving relative URI [" + href + "].");

            return new StreamSource(this.zipFile.getInputStream(new ZipEntry(href)));

        } catch (URISyntaxException e) {
            throw new TransformerException("Invalid URI", e);
        } catch (IOException e) {
            throw new TransformerException("Unexpected I/O error", e);
        }
    }
}