/*
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2011 INRIA, France Telecom
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
Provides a small and fast bytecode manipulation framework.
<p>
The <a href="http://www.objectweb.org/asm">ASM</a> framework is organized
around the {@link net.hasor.core.classcode.asm.ClassVisitor ClassVisitor},
{@link net.hasor.core.classcode.asm.FieldVisitor FieldVisitor},
{@link net.hasor.core.classcode.asm.MethodVisitor MethodVisitor} and
{@link net.hasor.core.classcode.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.
<p>
In addition to these main abstract classes, ASM provides a {@link
net.hasor.core.classcode.asm.ClassReader ClassReader} class, that can parse an
existing class and make a given visitor visit it. ASM also provides
a {@link net.hasor.core.classcode.asm.ClassWriter ClassWriter} class, which is
a visitor that generates Java class files.
<p>
In order to generate a class from scratch, only the {@link
net.hasor.core.classcode.asm.ClassWriter ClassWriter} class is necessary. Indeed,
in order to generate a class, one must just call its visit<i>Xxx</i>
methods with the appropriate arguments to generate the desired fields
and methods. See the "helloworld" example in the ASM distribution for
more details about class generation.
<p>
In order to modify existing classes, one must use a {@link
net.hasor.core.classcode.asm.ClassReader ClassReader} class to analyze
the original class, a class modifier, and a {@link net.hasor.core.classcode.asm.ClassWriter
ClassWriter} to construct the modified class. The class modifier
is just a {@link net.hasor.core.classcode.asm.ClassVisitor ClassVisitor}
that delegates most of the work to another {@link net.hasor.core.classcode.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 net.hasor.core.classcode.asm.ClassVisitor
ClassVisitor} and {@link net.hasor.core.classcode.asm.MethodVisitor MethodVisitor}
classes delegate by default all the method calls they receive to an
optional visitor. See the "adapt" example in the ASM
distribution for more details about class modification.
<p>
The size of the core ASM library, <tt>asm.jar</tt>, is only 45KB, which is much
smaller than the size of the
<a href="http://jakarta.apache.org/bcel">BCEL</a> library (504KB), and than the
size of the
<a href="http://serp.sourceforge.net">SERP</a> library (150KB). ASM is also
much faster than these tools. Indeed the overhead of a load time class
transformation process is of the order of 60% with ASM, 700% or more with BCEL,
and 1100% or more with SERP (see the <tt>test/perf</tt> directory in the ASM
distribution)!
@since ASM 1.3
*/
package net.hasor.core.classcode.asm;