org.apache.openjpa.enhance

Class CodeGenerator

java.lang.Object

org.apache.openjpa.enhance.CodeGenerator

public class CodeGenerator
extends Object

Generates Java class code from metadata.

Since:

0.3.0

Author:

Abe White, Stephen Kim

Constructor Summary

Constructors

Constructor and Description
CodeGenerator(ClassMetaData meta) Constructor.
CodeGenerator(OpenJPAConfiguration conf, Class type) Constructor.

Method Summary

Modifier and Type	Method and Description
protected void	closeClassBrace(CodeFormat code) Append the closing code-level brace to the code; this can be overridden to add code to the bottom of the class.
void	generateCode() Writes the generated code to the proper directory.
protected List	getClassAnnotations() Return class-level annotations.
protected String	getClassCode() Return a code template for the given class, or null to use the standard system-generated Java code.
String	getCode() Return the generated code, or null if generateCode() has not been called.
File	getCodeDirectory() The directory to write source to.
CodeFormat	getCodeFormat() The code formatter for the generated Java code.
protected String	getDeclaration(FieldMetaData field) Return a code template for the declaration of the given field, or null to use the system-generated default Java code.
protected List	getFieldAnnotations(FieldMetaData field) Return field-level annotations.
protected String	getFieldCode(FieldMetaData field) Return a code template for the get/set methods of the given field, or null to use the system-generated default Java code.
File	getFile() Return Java file to write to.
Set	getImportPackages() Returns the set of packages that needs to be imported for this code.
protected String	getInitialValue(FieldMetaData field) Return code for the initial value for the given field, or null to use the default generated by the system.
ClassMetaData	getMetaData() Return metadata for the type being generated.
Class	getType() Return the type being generated.
protected CodeFormat	newCodeFormat() Return a copy of the internal code format.
protected void	openClassBrace(CodeFormat code) Append the opening code-level brace to the code; this can be overridden to add code to the top of the class.
void	setCodeFormat(CodeFormat format) Set the code formatter for the generated Java code.
void	setDirectory(File dir) The directory to write source to.
protected boolean	useGenericCollections() Whether to use generic collections on one-to-many and many-to-many relations instead of untyped collections.
protected boolean	usePropertyBasedAccess() Whether to use property-based access on generated code.
void	writeCode() Write the generated code to the proper file.
void	writeCode(Writer out) Write the code to the specified Writer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CodeGenerator

public CodeGenerator(OpenJPAConfiguration conf,
                     Class type)

Constructor. Supply configuration and class to generate code for.

CodeGenerator

public CodeGenerator(ClassMetaData meta)

Constructor. Supply configuration and metadata to generate code for.

Method Detail

getCodeDirectory

public File getCodeDirectory()

The directory to write source to. Defaults to the current directory. If the given directory does not match the package of the metadata, the package structure will be created below the directory.

setDirectory

public void setDirectory(File dir)

The directory to write source to. Defaults to the current directory. If the given directory does not match the package of the metadata, the package structure will be created below the directory.

getCodeFormat

public CodeFormat getCodeFormat()

The code formatter for the generated Java code.

setCodeFormat

public void setCodeFormat(CodeFormat format)

Set the code formatter for the generated Java code.

getType

public Class getType()

Return the type being generated.

getMetaData

public ClassMetaData getMetaData()

Return metadata for the type being generated.

getCode

public String getCode()

Return the generated code, or null if generateCode() has not been called.

generateCode

public void generateCode()

Writes the generated code to the proper directory.

writeCode

public void writeCode()
               throws IOException

Write the generated code to the proper file.

Throws:

IOException

writeCode

public void writeCode(Writer out)
               throws IOException

Write the code to the specified Writer.

Throws:

IOException

getImportPackages

public Set getImportPackages()

Returns the set of packages that needs to be imported for this code.

openClassBrace

protected void openClassBrace(CodeFormat code)

Append the opening code-level brace to the code; this can be overridden to add code to the top of the class.

closeClassBrace

protected void closeClassBrace(CodeFormat code)

Append the closing code-level brace to the code; this can be overridden to add code to the bottom of the class.

getFile

public File getFile()

Return Java file to write to.

newCodeFormat

protected CodeFormat newCodeFormat()

Return a copy of the internal code format.

getClassCode

protected String getClassCode()

Return a code template for the given class, or null to use the standard system-generated Java code. To facilitate template reuse, the following parameters can appear in the template; the proper values will be subtituted by the system:

• ${packageDec}: The package declaration, in the form "package <package name >;", or empty string if no package.
• ${imports}: Imports for the packages used by the declared field types.
• ${className}: The name of the class, without package.
• ${extendsDec}: Extends declaration, in the form "extends <superclass>", or empty string if no superclass.
• ${constructor}: A constructor that takes in all primary key fields of the class, or empty string if the class uses datastore identity.
• ${fieldDecs}: Declarations of all the declared fields.
• ${fieldCode}: Get/set methods for all the declared fields.

Returns null by default.

getInitialValue

protected String getInitialValue(FieldMetaData field)

Return code for the initial value for the given field, or null to use the default generated by the system. Returns null by default.

getDeclaration

protected String getDeclaration(FieldMetaData field)

Return a code template for the declaration of the given field, or null to use the system-generated default Java code. To facilitate template reuse, the following parameters can appear in your template; the proper values will be subtituted by the system:

• ${fieldName}: The name of the field.
• ${capFieldName}: The capitalized field name.
• ${propertyName}: The field name without leading '_', if any.
• ${fieldType}: The field's type name.
• ${keyType}: Key type name for maps, null otherwise.
• ${elementType}: Element type name for collections, null otherwise.
• ${fieldValue}: The field's initial value, in the form " = <value>", or empty string if none.

Returns null by default.

getFieldCode

protected String getFieldCode(FieldMetaData field)

Return a code template for the get/set methods of the given field, or null to use the system-generated default Java code. To facilitate template reuse, the following parameters can appear in your template; the proper values will be subtituted by the system:

• ${fieldName}: The name of the field.
• ${capFieldName}: The capitalized field name.
• ${propertyName}: The field name without leading '_', if any.
• ${fieldType}: The field's type name.
• ${keyType}: Key type name for maps, null otherwise.
• ${elementType}: Element type name for collections, null otherwise.
• ${fieldValue}: The field's initial value, in the form "= <value>", or empty string if none.

usePropertyBasedAccess

protected boolean usePropertyBasedAccess()

Whether to use property-based access on generated code. Defaults to false (field-based).

getClassAnnotations

protected List getClassAnnotations()

Return class-level annotations. Returns null by default.

getFieldAnnotations

protected List getFieldAnnotations(FieldMetaData field)

Return field-level annotations. Returns null by default.

useGenericCollections

protected boolean useGenericCollections()

Whether to use generic collections on one-to-many and many-to-many relations instead of untyped collections. Override in descendants to change default behavior.