ExtParser.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.util.ArrayList;
import java.util.List;

import javax.xml.namespace.QName;

import org.apache.xmlrpc.serializer.XmlRpcWriter;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;


public abstract class ExtParser implements TypeParser {
        private Locator locator;
        private ContentHandler handler;
        private int level = 0;
        private final List prefixes = new ArrayList();

        protected abstract ContentHandler getExtHandler() throws SAXException;

        protected abstract String getTagName();

        public void endDocument() throws SAXException {
        }

        public void startDocument() throws SAXException {
        }

        public void characters(char[] pChars, int pOffset, int pLength)
                        throws SAXException {
                if (handler == null) {
                        if (!TypeParserImpl.isEmpty(pChars, pOffset, pLength)) {
                                throw new SAXParseException("Unexpected non-whitespace content: " + new String(pChars, pOffset, pLength),
                                                                                        locator);
                        }
                } else {
                        handler.characters(pChars, pOffset, pLength);
                }
        }

        public void ignorableWhitespace(char[] pChars, int pOffset, int pLength)
                        throws SAXException {
                if (handler != null) {
                        ignorableWhitespace(pChars, pOffset, pLength);
                }
        }

        public void endPrefixMapping(String pPrefix) throws SAXException {
                if (handler != null) {
                        handler.endPrefixMapping(pPrefix);
                }
        }

        public void skippedEntity(String pName) throws SAXException {
                if (handler == null) {
                        throw new SAXParseException("Don't know how to handle entity " + pName,
                                                                                locator);
                } else {
                        handler.skippedEntity(pName);
                }
        }

        public void setDocumentLocator(Locator pLocator) {
                locator = pLocator;
                if (handler != null) {
                        handler.setDocumentLocator(pLocator);
                }
        }

        public void processingInstruction(String pTarget, String pData)
                        throws SAXException {
                if (handler != null) {
                        handler.processingInstruction(pTarget, pData);
                }
        }

        public void startPrefixMapping(String pPrefix, String pURI)
                        throws SAXException {
                if (handler == null) {
                        prefixes.add(pPrefix);
                        prefixes.add(pURI);
                } else {
                        handler.startPrefixMapping(pPrefix, pURI);
                }
        }

        public void startElement(String pURI, String pLocalName,
                                                         String pQName, Attributes pAttrs) throws SAXException {
                switch (level++) {
                        case 0:
                                final String tag = getTagName();
                                if (!XmlRpcWriter.EXTENSIONS_URI.equals(pURI)  ||
                                        !tag.equals(pLocalName)) {
                                        throw new SAXParseException("Expected " +
                                                                                                new QName(XmlRpcWriter.EXTENSIONS_URI, tag) +
                                                                                                ", got " +
                                                                                                new QName(pURI, pLocalName),
                                                                                                locator);
                                }
                                handler = getExtHandler();
                                handler.startDocument();
                                for (int i = 0;  i < prefixes.size();  i += 2) {
                                        handler.startPrefixMapping((String) prefixes.get(i),
                                                                                           (String) prefixes.get(i+1));
                                }
                                break;
                        default:
                                handler.startElement(pURI, pLocalName, pQName, pAttrs);
                                break;
                }
        }

        public void endElement(String pURI, String pLocalName, String pQName)
                        throws SAXException {
                switch (--level) {
                        case 0:
                                for (int i = 0;  i < prefixes.size();  i += 2) {
                                        handler.endPrefixMapping((String) prefixes.get(i));
                                }
                                handler.endDocument();
                                handler = null;
                                break;
                        default:
                                handler.endElement(pURI, pLocalName, pQName);
                                break;
                }
        }
}