com.quinsoft.zeidon.DeserializeOi Maven / Gradle / Ivy
/**
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
* View stud2 = zencas.deserializeOi()
* .fromResource( "/tmp/stud2.json" )
* .setLodDef( "lStudDpt" )
* .asJson()
* .activateFirst();
*
*
* Some configuration values can be implied from the other values or from the
* the serialized stream. The above sample can be simplified:
*
* View stud2 = zencas.deserializeOi()
* .fromResource( "/tmp/stud2.json" )
* .activateFirst();
*
*/
public class DeserializeOi
{
private final Task task;
private LodDef lodDef;
private InputStream inputStream;
private String resourceName;
private EnumSet flags = ActivateFlags.MULTIPLE;
private StreamFormat format;
private Application application;
private StreamReader streamReader;
private String version;
/**
* This is a set of ViewEntities that we will allow to create dynamic
* work entities if an attribute in the stream does not exist in the
* entity.
*/
private Set allowDynamicAttributes;
/**
* If true, then automatically close the stream after activating.
* We will assume it's true unless the user explicitly sets the stream.
*/
private boolean closeStream = true;
private String inputString;
/**
* Create a deserializer. Client apps should use task.deserializeOi() instead
* of creating one directly.
*
* @param task
*/
public DeserializeOi( TaskQualification task )
{
this.task = task.getTask();
}
/**
* Returns the input stream.
*
* @return the inputStream
*/
public InputStream getInputStream()
{
return inputStream;
}
/**
* Sets the inputStream from whence the OI(s) will be loaded.
*
* Note: the resource stream will be automatically closed by the activate method unless it is
* overridden by calling setCloseStream( false ).
*
* @param inputStream the inputStream to set
*
* @return this
*/
public DeserializeOi fromInputStream( InputStream inputStream )
{
this.inputStream = inputStream;
if ( inputStream instanceof ZeidonInputStream )
setFormatFromFilename( ((ZeidonInputStream) inputStream).getDescription(), true );
return this;
}
/**
* Set the input stream by opening the resource. The resource can be either a
* filename or a resource name on the classpath. If the resource name is a file
* then the format of the stream can be determined from the name of the file.
* For example, if the file is "/tmp/myfile.json" then the format is assumed
* to be JSON. This can be overridden by calling setFormat().
*
* @param resourceName name of a file or a resource on the classpath.
*
* @return this
*/
public DeserializeOi fromResource( String resourceName )
{
this.inputStream = JoeUtils.getInputStream( task, resourceName );
if ( inputStream == null )
throw new ZeidonException( "Resource %s not found", resourceName );
this.resourceName = resourceName;
setFormatFromFilename( resourceName, true );
return this;
}
public DeserializeOi fromAppResource( String resourceName )
{
String objDir = getApplication().getObjectDir();
String fullName = objDir + "/" + resourceName;
this.inputStream = JoeUtils.getInputStream( task, fullName );
if ( inputStream == null )
throw new ZeidonException( "Application resource %s not found", fullName );
this.resourceName = fullName;
setFormatFromFilename( resourceName, true );
return this;
}
/**
* Get the stream from the Zeidon attribute. The attribute must be retrievable
* as a string.
*
* @param attribute Zeidon attribute.
*
* @return this
*/
public DeserializeOi fromAttribute( AttributeInstance attribute )
{
return fromString( attribute.getString() );
}
/**
* Set the input stream by opening the file. the format of the stream can be determined from the name of the file.
* For example, if the file is "/tmp/myfile.json" then the format is assumed
* to be JSON. This can be overridden by calling setFormat().
*
* This is a synonym for fromResource().
*
* @param resourceName name of the file.
*
* @return this
*/
public DeserializeOi fromFile( String filename )
{
inputStream = JoeUtils.getInputStream( task, filename );
if ( inputStream == null )
throw new ZeidonException( "Filename %s not found", filename );
this.resourceName = filename;
setFormatFromFilename( resourceName, true );
return this;
}
public DeserializeOi fromTempDir( String baseFilename )
{
String tempFile = System.getProperty( "java.io.tmpdir" ) + File.separator + baseFilename;
return fromFile( tempFile );
}
/**
* Convenience method that prepends the Zeidon HOME to the filename.
*
* @param filename
* @return
*/
public DeserializeOi fromZeidonHomeFile( String filename )
{
String tfile = getTask().getObjectEngine().getHomeDirectory();
// Append the dir separator if it's not specified.
if ( ! tfile.endsWith( "\\" ) && ! tfile.endsWith( "/" ) && filename.startsWith( "\\" ) && filename.startsWith( "/" ) )
tfile += "/";
tfile += filename;
return fromFile( tfile );
}
/**
* Convenience method that prepends the Application dir (i.e. the .XOD directory)
* to the filename.
*
* @param filename
* @return
*/
public DeserializeOi fromApplicationDir( String filename )
{
String tfile = getApplication().getObjectDir();
// Append the dir separator if it's not specified.
if ( ! tfile.endsWith( "\\" ) && ! tfile.endsWith( "/" ) )
tfile += "/";
tfile += filename;
return fromFile( tfile );
}
/**
* Set the input stream by opening the file.
*
* @param file the file
*
* @return this
*/
public DeserializeOi fromFile( File file )
{
try
{
resourceName = file.getAbsolutePath();
inputStream = new FileInputStream( file );
setFormatFromFilename( resourceName, true );
return this;
}
catch ( FileNotFoundException e )
{
throw ZeidonException.wrapException( e ).prependFilename( resourceName );
}
}
/**
* Sets the input stream to be from a string.
*
* @param inputString the input string.
*
* @return this
*/
public DeserializeOi fromString( String inputString )
{
try
{
inputStream = IOUtils.toInputStream( inputString, "UTF-8");
this.inputString = inputString;
return this;
}
catch ( IOException e )
{
throw ZeidonException.wrapException( e );
}
}
/**
* Activate all the OIs from the stream and return a list of views.
*
* @return list of views in the stream.
*/
public List activate()
{
try
{
return task.activateOisFromStream( this );
}
catch ( Exception e )
{
ZeidonException ze = ZeidonException.wrapException( e );
if ( ! StringUtils.isBlank( resourceName ) )
ze.prependFilename( resourceName );
if ( ! StringUtils.isBlank( inputString ) )
task.log().error( "OI String = %s", inputString );
throw ze;
}
}
/**
* Activates the OI(s) from the stream and returns the first one.
*
* @return the first View from the stream.
*/
public View activateFirst()
{
List v = activate();
return v.get( 0 );
}
/**
* @return the lodDef
*/
public LodDef getLodDef()
{
return lodDef;
}
/**
* @param lodDef the lodDef to set
* @return this
*/
public DeserializeOi setLodDef( LodDef lodDef )
{
this.lodDef = lodDef;
return this;
}
/**
* Sets the LOD definition by name.
*
* @param lodDefName name of the LOD.
*
* @return this
*/
public DeserializeOi setLodDef( String lodDefName )
{
lodDef = getApplication().getLodDef( getTask(), lodDefName );
return this;
}
/**
* Sets the LOD definition by name using the supplied application name to
* find the LOD def.
*
* @param lodDefName name of the LOD.
* @param appName name of the application. This overrides the current application
* (i.e. this.getApplication() ).
*
* @return this
*/
public DeserializeOi setLodDef( String appName, String lodDefName )
{
lodDef = getTask().getApplication(appName).getLodDef( getTask(), lodDefName );
return this;
}
/**
* Set the format depending on the extension of filename.
*
* @param filename
* @param ifNull if true only set format if it is null.
* @return this
*/
private DeserializeOi setFormatFromFilename( String filename, boolean ifNull )
{
if ( ifNull && format != null )
return this;
for ( StreamFormat f : StreamFormat.values() )
{
if ( f.matches( filename ) )
{
format = f;
break;
}
}
return this;
}
/**
* Sets the format of the input stream. Note that this can be determined if the
* source stream is a file or filename.
*
* @param format
*
* @return this
*/
public DeserializeOi setFormat( StreamFormat format )
{
this.format = format;
return this;
}
public DeserializeOi setFormat( String format )
{
this.format = StreamFormat.valueOf( format );
return this;
}
/**
* @return the format
*/
public StreamFormat getFormat()
{
// If format hasn't been set we'll default to POR.
if ( format == null )
return StreamFormat.POR;
return format;
}
public Task getTask()
{
return task;
}
public Application getApplication()
{
if ( application != null )
return application;
if ( lodDef != null )
return lodDef.getApplication();
return task.getApplication();
}
/**
* Sets the application for this deserializer. It is used to find the LodDef and
* is only necessary to override the default application for the task.
*
* @param application the application
*
* @return this
*/
public DeserializeOi setApplication( Application application )
{
this.application = application;
return this;
}
/**
* Sets the application for this deserializer. It is used to find the LodDef and
* is only necessary to override the default application for the task.
*
* @param appName the name of the application
*
* @return this
*/
public DeserializeOi setApplication( String appName )
{
this.application = task.getApplication( appName );
return this;
}
public EnumSet getFlags()
{
return flags;
}
public DeserializeOi setFlags( EnumSet flags )
{
if ( flags != null )
this.flags = flags;
return this;
}
public DeserializeOi setFlags( Integer control )
{
if ( control == null )
return this;
return setFlags( ActivateFlags.convertLongFlags( control ) );
}
/**
* Specifies that the format of the input stream is JSON.
*
* @return this
*/
public DeserializeOi asJson()
{
format = StreamFormat.JSON;
return this;
}
/**
* Specifies that the format of the input stream is XML.
*
* @return this
*/
public DeserializeOi asXml()
{
format = StreamFormat.XML;
return this;
}
/**
* If true, then the stream will be automatically closed after activation.
*/
public boolean isCloseStream()
{
return closeStream;
}
/**
* If set to true then the stream will be automatically closed after activation.
* Default is true.
*
* @param closeStream
*
* @return this
*/
public DeserializeOi closeStream( boolean closeStream )
{
this.closeStream = closeStream;
return this;
}
/**
* If an unknown attribute name is found for the specified entity, instead of throwing
* an error or ignoring it a dynamic attribute is created.
*
* @param entityName name of the entity that will accept dynamic attributes.
*
* @return this
*/
public DeserializeOi allowDynamicAttributesFor( String entityName )
{
if ( allowDynamicAttributes == null )
allowDynamicAttributes = new HashSet();
allowDynamicAttributes.add( entityName );
return this;
}
/**
* Returns list of entity names that allow dynamic attribute to be created.
* @return
*/
public Set getAllowableDynamicEntities()
{
return allowDynamicAttributes;
}
/**
* Returns the stream reader.
*
* @return the stream reader
*/
public StreamReader getStreamReader()
{
return streamReader;
}
/**
* Specifies a different stream reader than the default.
*
* @param streamReader
*/
public void using( StreamReader streamReader )
{
this.streamReader = streamReader;
}
public String getVersion()
{
return version;
}
/**
* Sets the expected version of the input stream and overrides the value in the stream.
* This allows a deserializer to accept a stream that doesn't have a version specified
* or overrides it.
*
* @param version expected version
*
* @return this
*/
public DeserializeOi setVersion( String version )
{
this.version = version;
return this;
}
}
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