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/*
 * Copyright 1999,2005 The Apache Software Foundation.
 * 
 * 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.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;


/** A parser for base64 elements.
 */
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());
		}
	}
}