/*
 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
 */
/*
 * 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 com.sun.org.apache.xalan.internal.xsltc.trax;

import java.io.IOException;

import javax.xml.transform.ErrorListener;
import javax.xml.transform.Templates;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.sax.SAXResult;

import com.sun.org.apache.xml.internal.utils.XMLReaderManager;
import jdk.xml.internal.JdkXmlUtils;

import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLFilterImpl;

/**
 * skeleton extension of XMLFilterImpl for now.
 * @author Santiago Pericas-Geertsen
 * @author G. Todd Miller
 */
public class TrAXFilter extends XMLFilterImpl {
    private Templates              _templates;
    private TransformerImpl        _transformer;
    private TransformerHandlerImpl _transformerHandler;
    private boolean _overrideDefaultParser;

    public TrAXFilter(Templates templates)  throws
        TransformerConfigurationException
    {
        _templates = templates;
        _transformer = (TransformerImpl) templates.newTransformer();
        _transformerHandler = new TransformerHandlerImpl(_transformer);
        _overrideDefaultParser = _transformer.overrideDefaultParser();
    }

    public Transformer getTransformer() {
        return _transformer;
    }

    private void createParent() throws SAXException {
        XMLReader parent = JdkXmlUtils.getXMLReader(_overrideDefaultParser,
                _transformer.isSecureProcessing());

        // make this XMLReader the parent of this filter
        setParent(parent);
    }

    @Override
    public void parse (InputSource input) throws SAXException, IOException
    {
        XMLReader managedReader = null;

        try {
            if (getParent() == null) {
                try {
                    managedReader = XMLReaderManager.getInstance(_overrideDefaultParser)
                                                    .getXMLReader();
                    setParent(managedReader);
                } catch (SAXException  e) {
                    throw new SAXException(e.toString());
                }
            }

            // call parse on the parent
            getParent().parse(input);
        } finally {
            if (managedReader != null) {
                XMLReaderManager.getInstance(_overrideDefaultParser).releaseXMLReader(managedReader);
            }
        }
    }

    public void parse (String systemId) throws SAXException, IOException
    {
        parse(new InputSource(systemId));
    }

    public void setContentHandler (ContentHandler handler)
    {
        _transformerHandler.setResult(new SAXResult(handler));
        if (getParent() == null) {
                try {
                    createParent();
                }
                catch (SAXException  e) {
                   return;
                }
        }
        getParent().setContentHandler(_transformerHandler);
    }

    public void setErrorListener (ErrorListener handler) { }
}
