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SAXDecoder.java
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65 lines (55 loc) · 2.15 KB
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/*
* Copyright 2013 Netflix, Inc.
*
* Licensed 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 feign.codec;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import java.io.IOException;
import java.io.Reader;
import java.lang.reflect.Type;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParserFactory;
import static feign.Util.checkNotNull;
import static feign.Util.checkState;
public abstract class SAXDecoder extends Decoder {
/* Implementations are not intended to be shared across requests. */
public interface ContentHandlerWithResult extends ContentHandler {
/* expected to be set following a call to {@link XMLReader#parse(InputSource)} */
Object getResult();
}
private final SAXParserFactory factory;
protected SAXDecoder() {
this(SAXParserFactory.newInstance());
factory.setNamespaceAware(false);
factory.setValidating(false);
}
protected SAXDecoder(SAXParserFactory factory) {
this.factory = checkNotNull(factory, "factory");
}
@Override
public Object decode(String methodKey, Reader reader, Type type) throws IOException, SAXException,
ParserConfigurationException {
ContentHandlerWithResult handler = typeToNewHandler(type);
checkState(handler != null, "%s returned null for type %s", this, type);
XMLReader xmlReader = factory.newSAXParser().getXMLReader();
xmlReader.setContentHandler(handler);
InputSource source = new InputSource(reader);
xmlReader.parse(source);
return handler.getResult();
}
protected abstract ContentHandlerWithResult typeToNewHandler(Type type);
}