java.lang.Object
org.apache.derby.impl.services.bytecode.GClass
org.apache.derby.impl.services.bytecode.BCClass
All Implemented Interfaces:
ClassBuilder

class BCClass extends GClass
ClassBuilder is used to construct a java class's byte array representation. Limitations: No checking for language use violations such as invalid modifiers or duplicate field names. All classes must have a superclass; java.lang.Object must be supplied if there is no superclass.

When a class is first created, it has:

  • a superclass
  • modifiers
  • a name
  • a package
  • no superinterfaces, methods, fields, or constructors
  • an empty static initializer
  • an empty initializer

MethodBuilder implementations are required to supply a way for Generators to give them code. Most typically, they may have a stream to which the Generator writes the code that is of the type to satisfy what the Generator is writing.

BCClass is a ClassBuilder implementation for generating java bytecode directly.

  • Field Details

    • limitMsg

      String limitMsg
      Simple text indicating any limits execeeded while generating the class file.
    • classHold

      protected ClassHolder classHold
    • superClassName

      protected String superClassName
    • name

      protected String name
    • factory

      BCJava factory
    • classType

      final Type classType
  • Constructor Details

  • Method Details

    • addField

      public LocalField addField(String javaType, String name, int modifiers)
      add a field to this class. Fields cannot be initialized here, they must be initialized in the static initializer code (static fields) or in the constructors.

      static fields also added to this list, with the modifier set appropriately.

      Parameters:
      javaType - The type of the field in java language.
      name - The name of the field.
      modifiers - The | of the modifier values such as public, static, etc.
      See Also:
    • getClassBytecode

      public ByteArray getClassBytecode() throws StandardException
      At the time the class is completed and bytecode generated, if there are no constructors then the default no-arg constructor will be defined.
      Throws:
      StandardException
    • getName

      public String getName()
      the class's unqualified name
    • newMethodBuilder

      public MethodBuilder newMethodBuilder(int modifiers, String returnType, String methodName)
      a method. Once it is created, thrown exceptions, statements, and local variable declarations must be added to it. It is put into its defining class when it is created. Java: #modifiers #returnType #methodName() {} // modifiers is the | of the JVM constants for // the modifiers such as static, public, etc.

      This is used to start a constructor as well; pass in null for the returnType when used in that manner. See java.lang.reflect.Modifiers

      Parameters:
      modifiers - the | of the Modifiers constants representing the visibility and control of this method.
      returnType - the return type of the method as its Java language type name.
      methodName - the name of the method.
      Returns:
      the method builder.
      See Also:
    • newMethodBuilder

      public MethodBuilder newMethodBuilder(int modifiers, String returnType, String methodName, String[] parms)
      a method with parameters. Once it is created, thrown exceptions, statements, and local variable declarations must be added to it. It is put into its defining class when it is created. Java: #modifiers #returnType #methodName() {} // modifiers is the | of the JVM constants for // the modifiers such as static, public, etc.

      This is used to start a constructor as well; pass in null for the returnType when used in that manner. See java.lang.reflect.Modifiers

      Parameters:
      modifiers - the | of the Modifiers constants representing the visibility and control of this method.
      returnType - the return type of the method as its Java language type name.
      methodName - the name of the method.
      parms - an array of ParameterDeclarations representing the method's parameters
      Returns:
      the method builder.
      See Also:
    • newConstructorBuilder

      public MethodBuilder newConstructorBuilder(int modifiers)
      a constructor. Once it is created, thrown exceptions, statements, and local variable declarations must be added to it. It is put into its defining class when it is created. Java: #modifiers #className() {} // modifiers is the | of the JVM constants for // the modifiers such as static, public, etc. // className is taken from definingClass.getName()

      This is used to start a constructor as well; pass in null for the returnType when used in that manner.

      See Modifiers

      Parameters:
      modifiers - the | of the Modifiers constants representing the visibility and control of this method.
      Returns:
      the method builder for the constructor.
      See Also:
    • getSuperClassName

      String getSuperClassName()
    • modify

      ClassHolder modify()
      Let those that need to get to the classModify tool to alter the class definition.
    • getClassFactory

      ClassFactory getClassFactory()
    • addLimitExceeded

      void addLimitExceeded(BCMethod mb, String limitName, int limit, int value)
      Add the fact that some class limit was exceeded while generating the class. We create a set of them and report at the end, this allows the generated class file to still be dumped.
      Parameters:
      mb -
      limitName -
      limit -
      value -
    • addLimitExceeded

      void addLimitExceeded(String rawText)
      Add the fact that some class limit was exceeded while generating the class. Text is the simple string passed in.
      Parameters:
      rawText - Text to be reported.
      See Also: