aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package com.sun.xml.internal.bind.v2.util;
aoqi@0: 
aoqi@0: import java.io.IOException;
aoqi@0: import java.io.InputStream;
aoqi@0: import java.io.InputStreamReader;
aoqi@0: import java.io.Reader;
aoqi@0: 
aoqi@0: import javax.activation.DataHandler;
aoqi@0: import javax.activation.DataSource;
aoqi@0: import javax.activation.MimeType;
aoqi@0: import javax.activation.MimeTypeParseException;
aoqi@0: import javax.xml.transform.Source;
aoqi@0: import javax.xml.transform.stream.StreamSource;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * {@link Source} implementation backed by {@link DataHandler}.
aoqi@0:  *
aoqi@0:  * <p>
aoqi@0:  * This implementation allows the same {@link Source} to be used
aoqi@0:  * mutliple times.
aoqi@0:  *
aoqi@0:  * <p>
aoqi@0:  * {@link Source} isn't really pluggable. As a consequence,
aoqi@0:  * this implementation is clunky --- weak against unexpected
aoqi@0:  * usage of the class.
aoqi@0:  *
aoqi@0:  * @author Kohsuke Kawaguchi
aoqi@0:  */
aoqi@0: public final class DataSourceSource extends StreamSource {
aoqi@0:     private final DataSource source;
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * If null, default to the encoding declaration
aoqi@0:      */
aoqi@0:     private final String charset;
aoqi@0: 
aoqi@0:     // remember the value we returned so that the 2nd invocation
aoqi@0:     // will return the same object, which is what's expeted out of
aoqi@0:     // StreamSource
aoqi@0:     private Reader r;
aoqi@0:     private InputStream is;
aoqi@0: 
aoqi@0:     public DataSourceSource(DataHandler dh) throws MimeTypeParseException {
aoqi@0:         this(dh.getDataSource());
aoqi@0:     }
aoqi@0: 
aoqi@0:     public DataSourceSource(DataSource source) throws MimeTypeParseException {
aoqi@0:         this.source = source;
aoqi@0: 
aoqi@0:         String ct = source.getContentType();
aoqi@0:         if(ct==null) {
aoqi@0:             charset = null;
aoqi@0:         } else {
aoqi@0:             MimeType mimeType = new MimeType(ct);
aoqi@0:             this.charset = mimeType.getParameter("charset");
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     @Override
aoqi@0:     public void setReader(Reader reader) {
aoqi@0:         throw new UnsupportedOperationException();
aoqi@0:     }
aoqi@0: 
aoqi@0:     @Override
aoqi@0:     public void setInputStream(InputStream inputStream) {
aoqi@0:         throw new UnsupportedOperationException();
aoqi@0:     }
aoqi@0: 
aoqi@0:     @Override
aoqi@0:     public Reader getReader() {
aoqi@0:         try {
aoqi@0:             if(charset==null)   return null;
aoqi@0:             if(r==null)
aoqi@0:                 r = new InputStreamReader(source.getInputStream(),charset);
aoqi@0:             return r;
aoqi@0:         } catch (IOException e) {
aoqi@0:             // argh
aoqi@0:             throw new RuntimeException(e);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     @Override
aoqi@0:     public InputStream getInputStream() {
aoqi@0:         try {
aoqi@0:             if(charset!=null)   return null;
aoqi@0:             if(is==null)
aoqi@0:                 is = source.getInputStream();
aoqi@0:             return is;
aoqi@0:         } catch (IOException e) {
aoqi@0:             // argh
aoqi@0:             throw new RuntimeException(e);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public DataSource getDataSource() {
aoqi@0:         return source;
aoqi@0:     }
aoqi@0: }