io.ebean.enhance.asm.package.html Maven / Gradle / Ivy
Package org.objectweb.asm
Provides a small and fast bytecode manipulation framework.
The ASM framework is organized
around the {@link io.ebean.enhance.asm.ClassVisitor ClassVisitor},
{@link io.ebean.enhance.asm.FieldVisitor FieldVisitor},
{@link io.ebean.enhance.asm.MethodVisitor MethodVisitor} and
{@link io.ebean.enhance.asm.AnnotationVisitor AnnotationVisitor} abstract classes,
which allow one to visit the fields, methods and annotations of a class,
including the bytecode instructions of each method.
In addition to these main abstract classes, ASM provides a {@link
io.ebean.enhance.asm.ClassReader ClassReader} class, that can parse an
existing class and make a given visitor visit it. ASM also provides
a {@link io.ebean.enhance.asm.ClassWriter ClassWriter} class, which is
a visitor that generates Java class files.
In order to generate a class from scratch, only the {@link
io.ebean.enhance.asm.ClassWriter ClassWriter} class is necessary. Indeed,
in order to generate a class, one must just call its visitXxx
methods with the appropriate arguments to generate the desired fields
and methods.
In order to modify existing classes, one must use a {@link
io.ebean.enhance.asm.ClassReader ClassReader} class to analyze
the original class, a class modifier, and a {@link io.ebean.enhance.asm.ClassWriter
ClassWriter} to construct the modified class. The class modifier
is just a {@link io.ebean.enhance.asm.ClassVisitor ClassVisitor}
that delegates most of the work to another {@link io.ebean.enhance.asm.ClassVisitor
ClassVisitor}, but that sometimes changes some parameter values,
or call additional methods, in order to implement the desired
modification process. In order to make it easier to implement such
class modifiers, the {@link io.ebean.enhance.asm.ClassVisitor
ClassVisitor} and {@link io.ebean.enhance.asm.MethodVisitor MethodVisitor}
classes delegate by default all the method calls they receive to an
optional visitor.
@since ASM 1.3