/**
* Copyright (C) cedarsoft GmbH.
*
* Licensed under the GNU General Public License version 3 (the "License")
* with Classpath Exception; you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.cedarsoft.org/gpl3ce
* (GPL 3 with Classpath Exception)
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3 only, as
* published by the Free Software Foundation. cedarsoft GmbH designates this
* particular file as subject to the "Classpath" exception as provided
* by cedarsoft GmbH in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 3 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 3 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact cedarsoft GmbH, 72810 Gomaringen, Germany,
* or visit www.cedarsoft.com if you need additional information or
* have any questions.
*/
package com.cedarsoft.couchdb.io;
import com.cedarsoft.couchdb.core.DocId;
import com.cedarsoft.couchdb.core.RawCouchDoc;
import com.cedarsoft.couchdb.core.Revision;
import com.cedarsoft.serialization.jackson.JacksonParserWrapper;
import com.cedarsoft.serialization.jackson.JacksonSupport;
import com.fasterxml.jackson.core.JsonEncoding;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import javax.annotation.Nonnull;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* @author Johannes Schneider (<a href="mailto:js@cedarsoft.com">js@cedarsoft.com</a>)
*/
public class RawCouchDocSerializer {
public static final String PROPERTY_ID = "_id";
public static final String PROPERTY_REV = "_rev";
@Nonnull
public byte[] serialize( @Nonnull RawCouchDoc info ) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
serialize( info, out );
return out.toByteArray();
}
public void serialize( @Nonnull RawCouchDoc doc, @Nonnull OutputStream out ) throws IOException {
try ( JsonGenerator generator = createJsonGenerator( out ) ) {
serialize( doc, generator );
}
}
public void serialize( @Nonnull RawCouchDoc doc, @Nonnull JsonGenerator generator ) throws IOException {
generator.writeStartObject();
serializeIdAndRev( generator, doc );
generator.writeEndObject();
}
@Nonnull
public RawCouchDoc deserialize( @Nonnull InputStream in ) throws IOException {
JsonParser parser = createJsonParser( in );
RawCouchDoc doc = deserialize( parser );
JacksonParserWrapper parserWrapper = new JacksonParserWrapper( parser );
parserWrapper.ensureParserClosed();
return doc;
}
@Nonnull
public RawCouchDoc deserialize( @Nonnull JsonParser parser ) throws IOException {
JacksonParserWrapper parserWrapper = new JacksonParserWrapper( parser );
parserWrapper.nextToken( JsonToken.START_OBJECT );
parserWrapper.nextFieldValue( PROPERTY_ID );
String id = parser.getText();
parserWrapper.nextFieldValue( PROPERTY_REV );
String rev = parser.getText();
parser.nextToken();
parserWrapper.ensureObjectClosed();
return new RawCouchDoc( new DocId( id ), new Revision( rev ) );
}
public static void serializeIdAndRev( @Nonnull JsonGenerator serializeTo, @Nonnull RawCouchDoc doc ) throws IOException {
serializeTo.writeStringField( PROPERTY_ID, doc.getId().asString() );
Revision rev = doc.getRev();
if ( rev != null ) {
serializeTo.writeStringField( PROPERTY_REV, rev.asString() );
}
}
@Nonnull
protected static JsonParser createJsonParser( @Nonnull InputStream in ) throws IOException {
JsonFactory jsonFactory = JacksonSupport.getJsonFactory();
return jsonFactory.createJsonParser( in );
}
@Nonnull
protected static JsonGenerator createJsonGenerator( @Nonnull OutputStream out ) throws IOException {
JsonFactory jsonFactory = JacksonSupport.getJsonFactory();
return jsonFactory.createJsonGenerator( out, JsonEncoding.UTF8 );
}
}