org.apache.poi.sl.draw.geom.PresetGeometries Maven / Gradle / Ivy

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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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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.poi.sl.draw.geom;

import java.io.InputStream;
import java.util.LinkedHashMap;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.transform.stream.StreamSource;

import org.apache.poi.sl.draw.binding.CTCustomGeometry2D;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
import org.apache.poi.util.StaxHelper;

/**
 * 
 */
public class PresetGeometries extends LinkedHashMap {
    private final static POILogger LOG = POILogFactory.getLogger(PresetGeometries.class);
    protected final static String BINDING_PACKAGE = "org.apache.poi.sl.draw.binding";
    
    protected static PresetGeometries _inst;

    protected PresetGeometries(){}

    @SuppressWarnings("unused")
    public void init(InputStream is) throws XMLStreamException, JAXBException {
        XMLInputFactory staxFactory = StaxHelper.newXMLInputFactory();
        XMLStreamReader streamReader = staxFactory.createXMLStreamReader(new StreamSource(is));
        try {
            // ignore StartElement:
            streamReader.nextTag();

            // JAXB:
            JAXBContext jaxbContext = JAXBContext.newInstance(BINDING_PACKAGE);
            Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();

            long cntElem = 0;
            while (streamReader.hasNext() && streamReader.nextTag() == XMLStreamConstants.START_ELEMENT) {
                String name = streamReader.getLocalName();
                JAXBElement el = unmarshaller.unmarshal(streamReader, CTCustomGeometry2D.class);
                CTCustomGeometry2D cus = el.getValue();
                cntElem++;

                if (containsKey(name)) {
                    LOG.log(POILogger.WARN, "Duplicate definition of " + name);
                }
                put(name, new CustomGeometry(cus));
            }
        } finally {
            streamReader.close();
        }
    }
    
    /**
     * Convert a single CustomGeometry object, i.e. from xmlbeans
     */
    public static CustomGeometry convertCustomGeometry(XMLStreamReader staxReader) {
        try {
            JAXBContext jaxbContext = JAXBContext.newInstance(BINDING_PACKAGE);
            Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
            JAXBElement el = unmarshaller.unmarshal(staxReader, CTCustomGeometry2D.class);
            return new CustomGeometry(el.getValue());
        } catch (JAXBException e) {
            LOG.log(POILogger.ERROR, "Unable to parse single custom geometry", e);
            return null;
        }
    }

    public static synchronized PresetGeometries getInstance(){
        if(_inst == null) {
            // use a local object first to not assign a partly constructed object
            // in case of failure
            PresetGeometries lInst = new PresetGeometries();
            try {
                try (InputStream is = PresetGeometries.class.
                        getResourceAsStream("presetShapeDefinitions.xml")) {
                    lInst.init(is);
                }
            } catch (Exception e){
                throw new RuntimeException(e);
            }
            _inst = lInst;
        }

        return _inst;
    }
}