DocumentToByteStringConverter.java
/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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 androidx.test.espresso.web.assertion;
import android.os.Binder;
import androidx.annotation.NonNull;
import androidx.test.espresso.remote.Converter;
import com.google.protobuf.ByteString;
import java.io.IOException;
import java.io.StringWriter;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
/**
* Converts a type {@link Document} into its {@link ByteString} representation.
*
* <p>This class uses {@link
* androidx.test.espresso.web.assertion.CompressorDecompressor.GZIPCompressor} to reduce the
* size of the document as much as possible to avoid hitting the {@link Binder} transaction limit.
*/
final class DocumentToByteStringConverter implements Converter<Document, ByteString> {
private static byte[] compressDocument(String document) throws IOException {
return CompressorDecompressor.compress(document.getBytes());
}
/**
* Convert an object of type {@link Document} into its {@link ByteString} representation.
*
* @param document to convert into a {@link ByteString}
*/
@Override
public ByteString convert(@NonNull Document document) {
try {
DOMSource docSource = new DOMSource(document);
Transformer transformer = TransformerFactory.newInstance().newTransformer();
StringWriter writer = new StringWriter();
StreamResult streamer = new StreamResult(writer);
transformer.transform(docSource, streamer);
return ByteString.copyFrom(compressDocument(writer.toString()));
} catch (TransformerException te) {
throw new RuntimeException("Could not convert!!!", te);
} catch (IOException ioe) {
throw new RuntimeException("Could not convert!!!", ioe);
}
}
}