com.quinsoft.zeidon.standardoe.WriteOisToJsonStream Maven / Gradle / Ivy
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/**
This file is part of the Zeidon Java Object Engine (Zeidon JOE).
Zeidon JOE is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Zeidon JOE 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with Zeidon JOE. If not, see flags;
private final Set ois = new HashSet();
private JsonGenerator jg;
private View currentView;
private final LinkedHashMap linkedMap = new LinkedHashMap<>(5);
private SerializationMapping mapper;
// 2018-05-23T00:18:23.110-07:00
private static final DateTimeFormatter JSON_DATE_FORMATTER = DateTimeFormatter.ofPattern( "yyyy-MM-dd HH:mm:ss.Sxxx" );
@Override
public void writeToStream( SerializeOi options, Writer writer )
{
this.viewList = options.getViewList();
this.options = options;
mapper = options.getSerializationMapping();
if ( options.getFlags() == null )
flags = EnumSet.noneOf( WriteOiFlags.class );
else
flags = options.getFlags();
if ( ! flags.contains( WriteOiFlags.INCREMENTAL ) )
throw new ZeidonException( "This JSON stream writer intended for writing incremental." );
// Create a set of all the OIs and turn off the record owner flag. The record owner
// flag will be used to determine if a linked EI has been written to the stream.
for ( View view : viewList )
{
ObjectInstance oi = ((InternalView) view).getViewImpl().getObjectInstance();
ois.add( oi );
for ( EntityInstanceImpl ei = oi.getRootEntityInstance(); ei != null; ei = ei.getNextTwin() )
ei.setRecordOwner( false );
}
JsonFactory jsonF = new JsonFactory();
try
{
jg = jsonF.createGenerator( writer );
if ( ! options.isCompressed() )
jg.useDefaultPrettyPrinter(); // enable indentation just to make debug/testing easier
jg.writeStartObject();
// Write meta info for entire JSON object.
jg.writeObjectFieldStart( ".meta" );
jg.writeStringField( "version", VERSION );
if ( options.isWriteDate() )
jg.writeObjectField( "datetime", ZonedDateTime.now() );
jg.writeEndObject();
jg.writeArrayFieldStart( "OIs" );
for ( View view : viewList )
{
currentView = view;
jg.writeStartObject();
writeOi( view );
jg.writeEndObject();
}
jg.writeEndArray();
jg.writeEndObject();
jg.close();
}
catch ( Exception e )
{
throw ZeidonException.wrapException( e );
}
}
private void writeOi( View view ) throws Exception
{
SelectSet rootSelectSet = null;
Map sets = options.getRootSelectSets();
if ( sets != null )
rootSelectSet = sets.get( view.getOiId() );
writeOiMeta( view );
EntityDef lastEntityDef = null;
ViewImpl viewImpl = ((InternalView)view).getViewImpl();
for ( EntityInstanceImpl ei = viewImpl.getObjectInstance().getRootEntityInstance();
ei != null;
ei = ei.getNextTwin() )
{
// If we have a root select set and the EI is not selected then skip it.
if ( rootSelectSet != null && rootSelectSet.isSelected( ei ) )
continue;
lastEntityDef = writeEntity( ei, lastEntityDef );
}
if ( lastEntityDef != null )
jg.writeEndArray();
}
private void writeOiMeta( View view ) throws Exception
{
ObjectInstance oi = ((InternalView) view).getViewImpl().getObjectInstance();
jg.writeObjectFieldStart( ".oimeta" );
jg.writeStringField( "application", view.getLodDef().getApplication().getName() );
jg.writeStringField( "odName", view.getLodDef().getName() );
jg.writeBooleanField( "incremental", true );
if ( oi.isReadOnly() )
jg.writeBooleanField( "readOnlyOi", true );
else
if ( view.isReadOnly() )
jg.writeBooleanField( "readOnly", true );
if ( oi.isLocked() )
jg.writeBooleanField( "locked", true );
Integer rootCount = view.getTotalRootCount();
if ( rootCount != null )
jg.writeNumberField( "totalRootCount", rootCount );
writePagination( view );
jg.writeEndObject();
}
private void writePagination( View view ) throws Exception
{
ActivateOptions options = view.getActivateOptions();
if ( options == null )
return;
Pagination paging = options.getPagingOptions();
if ( paging == null )
return;
jg.writeObjectFieldStart( "pagination" );
jg.writeNumberField( "pageSize", paging.getPageSize() );
jg.writeNumberField( "currentPage", paging.getPageNumber() );
Integer rootCount = view.getTotalRootCount();
if ( rootCount != null )
{
jg.writeNumberField( "totalCount", rootCount );
jg.writeNumberField( "totalPages", rootCount / paging.getPageSize() + 1 );
}
jg.writeEndObject();
}
/**
* Convert the name of the EntityDef to the object name used in JSON.
* @param entityDef
* @return
*/
private String objectName( EntityDef entityDef )
{
String objectName = mapper.entityToRecord( entityDef );
return camelCaseName( objectName );
}
private String fieldName( AttributeDef attributeDef )
{
String fieldName = mapper.attributeToField( attributeDef );
return camelCaseName( fieldName );
}
private String camelCaseName( String name )
{
if ( ! options.isCamelCase() )
return name;
char[] nameChars = name.toCharArray();
for ( int i = 0; i < nameChars.length; i++ )
{
if ( ! Character.isUpperCase( nameChars[ i ] ) )
break;
nameChars[ i ] = Character.toLowerCase( nameChars[ i ] );
}
return String.valueOf( nameChars );
}
private EntityDef writeEntity( EntityInstanceImpl ei, EntityDef lastEntityDef ) throws Exception
{
try
{
// See if we need to open or close an array field.
final EntityDef entityDef = ei.getEntityDef();
if ( lastEntityDef != entityDef )
{
if ( lastEntityDef != null )
jg.writeEndArray();
lastEntityDef = entityDef;
jg.writeArrayFieldStart( objectName( entityDef ) );
}
jg.writeStartObject();
boolean writePersistent = writeEntityMeta( ei );
for ( AttributeDef attributeDef : entityDef.getAttributes() )
{
// If the attribute is not persistent and we're only writing persistent
// then go to the next one.
if ( attributeDef.isPersistent() && ! writePersistent )
continue;
if ( attributeDef.isDerived() && ! options.isWriteDerivedAttributes() )
continue;
if ( attributeDef.isHidden() && ! options.isWriteHiddenAttributes() )
continue;
AttributeInstanceImpl attrib = ei.getAttribute( attributeDef );
if ( attrib.isNull() && ! attrib.isUpdated() )
continue;
AttributeValue attribValue = ei.getInternalAttribute( attributeDef );
// Check for integer, double, or boolean so that it gets written without quotes.
// TODO: Do this more dynamically.
Domain domain = attributeDef.getDomain();
String jsonName = fieldName( attributeDef );
if ( domain instanceof IntegerDomain )
jg.writeNumberField( jsonName, attrib.getInteger() );
else
if ( domain instanceof DoubleDomain )
jg.writeNumberField( jsonName, attrib.getDouble() );
else
if ( domain instanceof BooleanDomain )
jg.writeBooleanField( jsonName, attrib.getBoolean() );
else
if ( domain instanceof LongDomain )
jg.writeNumberField( jsonName, (Long) attrib.getValue() );
else
if ( domain instanceof BigDecimalDomain )
jg.writeNumberField( jsonName, (BigDecimal) attrib.getValue() );
else
if ( domain instanceof DateTimeDomain ) {
ZonedDateTime date = (ZonedDateTime) attrib.getValue();
String str = JSON_DATE_FORMATTER.format( date );
jg.writeStringField( jsonName, str );
}
else
{
String value = attribValue.getString( ei.getTask(), attributeDef );
jg.writeStringField( jsonName, value );
}
if ( attributeDef.isPersistent() )
writeAttributeMeta( attribValue, attributeDef );
}
// Loop through the children and add them.
EntityDef lastChildEntityDef = null;
for ( EntityInstanceImpl child : ei.getDirectChildren( true, false ) )
{
lastChildEntityDef = writeEntity( child, lastChildEntityDef );
}
if ( lastChildEntityDef != null )
jg.writeEndArray();
jg.writeEndObject();
return entityDef;
}
catch ( Exception e )
{
throw ZeidonException.wrapException( e ).prependEntityInstance( ei );
}
}
private void writeAttributeMeta( AttributeValue attrib, AttributeDef attributeDef )
throws JsonGenerationException, IOException
{
if ( ! attrib.isUpdated() )
return;
jg.writeObjectFieldStart( "." + fieldName( attributeDef ) );
jg.writeStringField( "updated", "true" );
jg.writeEndObject();
}
private String createIncrementalStr( EntityInstanceImpl ei )
{
String str = "";
if ( ei.isUpdated() )
str += 'U';
if ( ei.isCreated() )
str += 'C';
if ( ei.isDeleted() )
str += 'D';
if ( ei.isIncluded() )
str += 'I';
if ( ei.isExcluded() )
str += 'X';
return str;
}
/**
* If this EI is linked with another EI in the OI set then this returns the record owner.
* If no record owner, returns EI.
*
* @param ei
* @return
*/
private EntityInstanceImpl findLinkedRecordOwner( EntityInstanceImpl ei )
{
// Keep track of whether we found another EI linked with this one.
boolean foundLinked = false;
// Run through the list of the other linked instances.
for ( EntityInstanceImpl linked : ei.getLinkedInstances() )
{
if ( ois.contains( linked.getObjectInstance() ) )
{
foundLinked = true;
if ( linked.isRecordOwner() )
return linked;
}
}
// If we get here then we didn't find a record owner. if foundLinked is true
// then we did find a linked EI.
if ( foundLinked )
return ei;
// Didn't find any EI's that are linked with ei.
return null;
}
/**
* Returns true if we should also write the persistent attributes of the EI. We
* don't write the persistent attributes if the EI is linked and it's not the
* record owner.
*
* @param ei
* @return
* @throws Exception
*/
private boolean writeEntityMeta( EntityInstanceImpl ei ) throws Exception
{
boolean writeAttributes = true;
EntityInstanceImpl recordOwner = findLinkedRecordOwner( ei );
EntityDef entityDef = ei.getEntityDef();
boolean selectedCursor = currentView.cursor( entityDef ).getEntityInstance() == ei;
linkedMap.clear();
String str = createIncrementalStr( ei );
if ( ! StringUtils.isBlank( str ) )
linkedMap.put( "incrementals", str );
if ( selectedCursor && options.isWithCursors() )
linkedMap.put( "selected", true );
if ( ei.isIncomplete() )
linkedMap.put( "incomplete", true );
if ( ei.hasLoadedLazyChildren() )
{
StringBuilder sb = new StringBuilder();
for ( EntityDef def : ei.getEntitiesLoadedLazily() )
sb.append( "," ).append( def.getName() );
sb.deleteCharAt( 0 );
linkedMap.put( "lazyLoaded", sb.toString() );
}
if ( recordOwner != null )
{
if ( recordOwner == ei )
{
// TODO: validate that ei.entityDef has all the attributes in the shared
// attribute hash.
ei.setRecordOwner( true );
linkedMap.put( "isLinkedSource", true );
linkedMap.put( "entityKey", Long.toString( ei.getEntityKey() ) );
}
else
{
// Write the entity key of the record owner.
linkedMap.put( "linkedSource", Long.toString( recordOwner.getEntityKey() ));
writeAttributes = false;
}
}
if ( linkedMap.size() == 0 )
return writeAttributes;
jg.writeObjectFieldStart( ".meta" );
for ( String key : linkedMap.keySet() )
jg.writeObjectField( key, linkedMap.get( key ) );
jg.writeEndObject();
return writeAttributes;
}
}
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