cn.ipokerface.weixin.request.WeixinErrorHolder Maven / Gradle / Ivy

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package cn.ipokerface.weixin.request;

import cn.ipokerface.weixin.utils.IOUtils;
import cn.ipokerface.weixin.utils.StringUtil;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.XMLReaderFactory;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Created by       PokerFace
 * Create Date      2019-12-27.
 * Email:           [email protected]
 * Version          1.0.0
 * 
 * Description:
 */
public class WeixinErrorHolder {

    private static       byte[]              errorXmlByteArray;
    private final static Map errorCacheMap;

    static {
        errorCacheMap = new ConcurrentHashMap();
        try {
            errorXmlByteArray = IOUtils.toByteArray(WeixinErrorHolder.class.getResourceAsStream("error.xml"));
        } catch (IOException e) {
            ;
        }
    }

    private static class ErrorTextHandler extends DefaultHandler {

        private final String code;

        public ErrorTextHandler(String code) {
            this.code = code;
        }

        private String  text;
        private boolean codeElement;
        private boolean textElement;
        private boolean findElement;

        @Override
        public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
            codeElement = qName.equalsIgnoreCase("code");
            textElement = qName.equalsIgnoreCase("text");
        }

        @Override
        public void endElement(String uri, String localName, String qName) throws SAXException {
        }

        @Override
        public void characters(char[] ch, int start, int length) throws SAXException {
            String _text = new String(ch, start, length);
            if (codeElement && _text.equalsIgnoreCase(code)) {
                findElement = true;
            } else if (textElement && findElement) {
                text = _text;
                throw new SAXException("ENOUGH");
            }
        }

        public String getText() {
            return StringUtil.isBlank(text) ? "" : text;
        }
    }

    public static String getText(String code) throws RuntimeException {
        if (StringUtil.isBlank(code)) {
            return "";
        }
        String text = errorCacheMap.get(code);
        if (StringUtil.isBlank(text)) {
            ErrorTextHandler textHandler = new ErrorTextHandler(code);
            try {
                XMLReader xmlReader = XMLReaderFactory.createXMLReader();
                xmlReader.setContentHandler(textHandler);
                xmlReader.parse(new InputSource(new ByteArrayInputStream(errorXmlByteArray)));
                text = textHandler.getText();
                errorCacheMap.put(code, text);
            } catch (IOException e) {
                throw new RuntimeException(e);
            } catch (SAXException e) {
                text = textHandler.getText();
                errorCacheMap.put(code, text);
            }
        }
        return text;
    }
}