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/*
* Copyright (c) 2015, Isode Limited.
* All rights reserved.
*/
package com.isode.stroke.entity;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import com.isode.stroke.elements.Payload;
import com.isode.stroke.parser.AttributeMap;
import com.isode.stroke.parser.PayloadParser;
import com.isode.stroke.parser.PlatformXMLParserFactory;
import com.isode.stroke.parser.XMLParser;
import com.isode.stroke.parser.XMLParserClient;
public class GenericPayloadLoader<PayloadType extends Payload, Parser extends PayloadParser> {
private final Parser parser;
public GenericPayloadLoader(Parser parser) {
this.parser = parser;
}
@SuppressWarnings("unchecked")
public PayloadType loadPayload(final InputStream is) throws IOException {
if (is == null) return null;
final StringBuilder sb = new StringBuilder(2048);
final char[] read = new char[2048];
final InputStreamReader ir = new InputStreamReader(is, "UTF-8");
for (int i; -1 != (i = ir.read(read)); sb.append(read, 0, i));
final XMLParser xmlParser = PlatformXMLParserFactory.createXMLParser(new ParserClient(parser));
xmlParser.parse(sb.toString());
return (PayloadType) parser.getPayload();
}
private static class ParserClient implements XMLParserClient {
private final PayloadParser parser;
public ParserClient(PayloadParser parser) {
this.parser = parser;
}
@Override
public void handleStartElement(String element, String ns, AttributeMap attributes) {
parser.handleStartElement(element, ns, attributes);
}
@Override
public void handleEndElement(String element, String ns) {
parser.handleEndElement(element, ns);
}
@Override
public void handleCharacterData(String data) {
parser.handleCharacterData(data);
}
}
}
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