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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.IOException;
import java.io.InputStream;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.TreeMap;

import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.transform.stream.StreamSource;

import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
import org.apache.poi.util.XMLHelper;

public final class PresetGeometries {
    private final static POILogger LOG = POILogFactory.getLogger(PresetGeometries.class);

    private final Map map = new TreeMap<>();

    private static class SingletonHelper{
        private static final PresetGeometries INSTANCE = new PresetGeometries();
    }

    public static PresetGeometries getInstance(){
        return SingletonHelper.INSTANCE;
    }

    private PresetGeometries() {
        // use a local object first to not assign a partly constructed object in case of failure
        try {
            try (InputStream is = PresetGeometries.class.getResourceAsStream("presetShapeDefinitions.xml")) {
                XMLInputFactory staxFactory = XMLHelper.newXMLInputFactory();
                XMLStreamReader sr = staxFactory.createXMLStreamReader(new StreamSource(is));
                try {
                    PresetParser p = new PresetParser(PresetParser.Mode.FILE);
                    p.parse(sr);
                    p.getGeom().forEach(map::put);
                } finally {
                    sr.close();
                }
            }
        } catch (IOException | XMLStreamException e){
            throw new RuntimeException(e);
        }
    }

    /**
     * Convert a single CustomGeometry object, i.e. from xmlbeans
     */
    public static CustomGeometry convertCustomGeometry(XMLStreamReader staxReader) {
        try {
            PresetParser p = new PresetParser(PresetParser.Mode.SHAPE);
            p.parse(staxReader);
            return p.getGeom().values().stream().findFirst().orElse(null);
        } catch (XMLStreamException e) {
            LOG.log(POILogger.ERROR, "Unable to parse single custom geometry", e);
            return null;
        }
    }

    public CustomGeometry get(String name) {
        return name == null ? null : map.get(name);
    }

    public Set keySet() {
        return map.keySet();
    }

    public int size() {
        return map.size();
    }

    @SuppressWarnings("EqualsWhichDoesntCheckParameterClass")
    @Override
    public boolean equals(Object o) {
        return (this == o);
    }

    @Override
    public int hashCode() {
        return Objects.hash(map);
    }
}