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  Package org.objectweb.asm


Provides a small and fast bytecode manipulation framework.

The ASM framework is organized around the {@link org.objectweb.asm.ClassVisitor ClassVisitor}, {@link org.objectweb.asm.FieldVisitor FieldVisitor}, {@link org.objectweb.asm.MethodVisitor MethodVisitor} and {@link org.objectweb.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 org.objectweb.asm.ClassReader ClassReader} class, that can parse an existing class and make a given visitor visit it. ASM also provides a {@link org.objectweb.asm.ClassWriter ClassWriter} class, which is a visitor that generates Java class files.

In order to generate a class from scratch, only the {@link org.objectweb.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 org.objectweb.asm.ClassReader ClassReader} class to analyze the original class, a class modifier, and a {@link org.objectweb.asm.ClassWriter ClassWriter} to construct the modified class. The class modifier is just a {@link org.objectweb.asm.ClassVisitor ClassVisitor} that delegates most of the work to another {@link org.objectweb.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 org.objectweb.asm.ClassVisitor ClassVisitor} and {@link org.objectweb.asm.MethodVisitor MethodVisitor} classes delegate by default all the method calls they receive to an optional visitor. @since ASM 1.3





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