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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.document.json;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonFactoryBuilder;
import com.fasterxml.jackson.core.StreamReadConstraints;
import com.yahoo.document.DocumentOperation;
import com.yahoo.document.DocumentPut;
import com.yahoo.document.DocumentRemove;
import com.yahoo.document.DocumentTypeManager;
import com.yahoo.document.DocumentUpdate;
import com.yahoo.vespaxmlparser.DocumentFeedOperation;
import com.yahoo.vespaxmlparser.DocumentUpdateFeedOperation;
import com.yahoo.vespaxmlparser.FeedOperation;
import com.yahoo.vespaxmlparser.FeedReader;
import com.yahoo.vespaxmlparser.RemoveFeedOperation;
import java.io.InputStream;
/**
* Facade between JsonReader and the FeedReader API.
*
* The feed reader will take ownership of the input stream and close it when the
* last parseable document has been read.
*
* @author Steinar Knutsen
*/
public class JsonFeedReader implements FeedReader {
private final JsonReader reader;
private final InputStream stream;
private static final JsonFactory jsonFactory = new JsonFactoryBuilder()
.disable(JsonFactory.Feature.CANONICALIZE_FIELD_NAMES)
.streamReadConstraints(StreamReadConstraints.builder().maxStringLength(Integer.MAX_VALUE).build())
.build();
public JsonFeedReader(InputStream stream, DocumentTypeManager docMan) {
reader = new JsonReader(docMan, stream, jsonFactory);
this.stream = stream;
}
@Override
public FeedOperation read() throws Exception {
DocumentOperation documentOperation = reader.next();
if (documentOperation == null) {
stream.close();
return FeedOperation.INVALID;
}
if (documentOperation instanceof DocumentUpdate) {
return new DocumentUpdateFeedOperation((DocumentUpdate) documentOperation);
} else if (documentOperation instanceof DocumentRemove) {
return new RemoveFeedOperation((DocumentRemove)documentOperation);
} else if (documentOperation instanceof DocumentPut) {
return new DocumentFeedOperation((DocumentPut) documentOperation);
} else {
throw new IllegalArgumentException("Got unknown class from JSON reader: " + documentOperation.getClass().getName());
}
}
}
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