ByteArrayParser.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.xmlrpc.parser;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.xml.namespace.QName;

import org.apache.ws.commons.util.Base64;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;


public class ByteArrayParser extends TypeParserImpl {
        private int level;
        private ByteArrayOutputStream baos;
        private Base64.Decoder decoder;

        public void startDocument() throws SAXException {
                level = 0;
        }

        public void characters(char[] pChars, int pStart, int pLength) throws SAXException {
                if (baos == null) {
                        if (!isEmpty(pChars, pStart, pLength)) {
                                throw new SAXParseException("Unexpected non-whitespace characters",
                                                                                        getDocumentLocator());
                        }
                } else {
                        try {
                                decoder.write(pChars, pStart, pLength);
                        } catch (IOException e) {
                                throw new SAXParseException("Failed to decode base64 stream.", getDocumentLocator(), e);
                        }
                }
        }

        public void endElement(String pURI, String pLocalName, String pQName) throws SAXException {
                if (--level == 0) {
                        try {
                                decoder.flush();
                        } catch (IOException e) {
                                throw new SAXParseException("Failed to decode base64 stream.", getDocumentLocator(), e);
                        }
                        setResult(baos.toByteArray());
                } else {
                        throw new SAXParseException("Unexpected end tag in atomic element: "
                                                                                + new QName(pURI, pLocalName),
                                                                                getDocumentLocator());
                }
        }

        public void startElement(String pURI, String pLocalName, String pQName, Attributes pAttrs) throws SAXException {
                if (level++ == 0) {
                        baos = new ByteArrayOutputStream();
                        decoder = new Base64.Decoder(1024){
                                protected void writeBuffer(byte[] pBytes, int pOffset, int pLen) throws IOException {
                                        baos.write(pBytes, pOffset, pLen);
                                }
                        };
                } else {
                        throw new SAXParseException("Unexpected start tag in atomic element: "
                                                                                + new QName(pURI, pLocalName),
                                                                                getDocumentLocator());
                }
        }
}