RecursiveTypeParserImpl.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 javax.xml.namespace.QName;

import org.apache.ws.commons.util.NamespaceContextImpl;
import org.apache.xmlrpc.XmlRpcException;
import org.apache.xmlrpc.common.TypeFactory;
import org.apache.xmlrpc.common.XmlRpcExtensionException;
import org.apache.xmlrpc.common.XmlRpcStreamConfig;
import org.apache.xmlrpc.serializer.XmlRpcWriter;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;


public abstract class RecursiveTypeParserImpl extends TypeParserImpl {
        private final NamespaceContextImpl context;
        protected final XmlRpcStreamConfig cfg;
        private final TypeFactory factory;
        private boolean inValueTag;
        private TypeParser typeParser;
    private StringBuffer text = new StringBuffer();

        protected RecursiveTypeParserImpl(XmlRpcStreamConfig pConfig,
                                                                          NamespaceContextImpl pContext,
                                                                          TypeFactory pFactory) {
                cfg = pConfig;
                context = pContext;
                factory = pFactory;
        }

        protected void startValueTag() throws SAXException {
                inValueTag = true;
                text.setLength(0);
                typeParser = null;
        }

        protected abstract void addResult(Object pResult) throws SAXException;

        protected void endValueTag() throws SAXException {
                if (inValueTag) {
                        if (typeParser == null) {
                                addResult(text.toString());
                text.setLength(0);
                        } else {
                                typeParser.endDocument();
                                try {
                                        addResult(typeParser.getResult());
                                } catch (XmlRpcException e) {
                                        throw new SAXException(e);
                                }
                                typeParser = null;
                        }
                } else {
                        throw new SAXParseException("Invalid state: Not inside value tag.",
                                                                                getDocumentLocator());
                }
        }

        public void startDocument() throws SAXException {
                inValueTag = false;
        text.setLength(0);
                typeParser = null;
        }

        public void endElement(String pURI, String pLocalName, String pQName)
                        throws SAXException {
                if (inValueTag) {
                        if (typeParser == null) {
                                throw new SAXParseException("Invalid state: No type parser configured.",
                                                                                        getDocumentLocator());
                        } else {
                                typeParser.endElement(pURI, pLocalName, pQName);
                        }
                } else {
                        throw new SAXParseException("Invalid state: Not inside value tag.",
                                        getDocumentLocator());
                }
        }

        public void startElement(String pURI, String pLocalName,
                                                         String pQName, Attributes pAttrs) throws SAXException {
                if (inValueTag) {
                        if (typeParser == null) {
                                typeParser = factory.getParser(cfg, context, pURI, pLocalName);
                                if (typeParser == null) {
                                        if (XmlRpcWriter.EXTENSIONS_URI.equals(pURI)  &&  !cfg.isEnabledForExtensions()) {
                                                String msg = "The tag " + new QName(pURI, pLocalName) + " is invalid, if isEnabledForExtensions() == false.";
                                                throw new SAXParseException(msg, getDocumentLocator(),
                                                                                                        new XmlRpcExtensionException(msg));
                                        } else {
                                                throw new SAXParseException("Unknown type: " + new QName(pURI, pLocalName),
                                                                                                        getDocumentLocator());
                                        }
                                }
                                typeParser.setDocumentLocator(getDocumentLocator());
                                typeParser.startDocument();
                                if (text.length() > 0) {
                                        typeParser.characters(text.toString().toCharArray(), 0, text.length());
                    text.setLength(0);
                                }
                        }
                        typeParser.startElement(pURI, pLocalName, pQName, pAttrs);
                } else {
                        throw new SAXParseException("Invalid state: Not inside value tag.",
                                        getDocumentLocator());
                }
        }

        public void characters(char[] pChars, int pOffset, int pLength) throws SAXException {
                if (typeParser == null) {
                        if (inValueTag) {
                            text.append(pChars, pOffset, pLength);
                        } else {
                                super.characters(pChars, pOffset, pLength);
                        }
                } else {
                        typeParser.characters(pChars, pOffset, pLength);
                }
        }

        public void ignorableWhitespace(char[] pChars, int pOffset, int pLength) throws SAXException {
                if (typeParser == null) {
                        if (inValueTag) {
                            text.append(pChars, pOffset, pLength);
                        } else {
                                super.ignorableWhitespace(pChars, pOffset, pLength);
                        }
                } else {
                        typeParser.ignorableWhitespace(pChars, pOffset, pLength);
                }
        }

        public void processingInstruction(String pTarget, String pData) throws SAXException {
                if (typeParser == null) {
                        super.processingInstruction(pTarget, pData);
                } else {
                        typeParser.processingInstruction(pTarget, pData);
                }
        }

        public void skippedEntity(String pEntity) throws SAXException {
                if (typeParser == null) {
                        super.skippedEntity(pEntity);
                } else {
                        typeParser.skippedEntity(pEntity);
                }
        }

        public void startPrefixMapping(String pPrefix, String pURI) throws SAXException {
                if (typeParser == null) {
                        super.startPrefixMapping(pPrefix, pURI);
                } else {
                        context.startPrefixMapping(pPrefix, pURI);
                }
        }

        public void endPrefixMapping(String pPrefix) throws SAXException {
                if (typeParser == null) {
                        super.endPrefixMapping(pPrefix);
                } else {
                        context.endPrefixMapping(pPrefix);
                }
        }
}