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<title>org.objectweb.asm (ASM Documentation)</title>
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<h1 title="Package" class="title">Package org.objectweb.asm</h1>
<div class="docSummary">
<div class="block">Provides a small and fast bytecode manipulation framework.</div>
</div>
<p>See: <a href="#package_description">Description</a></p>
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<table class="packageSummary" border="0" cellpadding="3" cellspacing="0" summary="Interface Summary table, listing interfaces, and an explanation">
<caption><span>Interface Summary</span><span class="tabEnd"> </span></caption>
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<th class="colFirst" scope="col">Interface</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tbody>
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<td class="colFirst"><a href="../../../org/objectweb/asm/AnnotationVisitor.html" title="interface in org.objectweb.asm">AnnotationVisitor</a></td>
<td class="colLast">
<div class="block">A visitor to visit a Java annotation.</div>
</td>
</tr>
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<td class="colFirst"><a href="../../../org/objectweb/asm/ClassVisitor.html" title="interface in org.objectweb.asm">ClassVisitor</a></td>
<td class="colLast">
<div class="block">A visitor to visit a Java class.</div>
</td>
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<td class="colFirst"><a href="../../../org/objectweb/asm/FieldVisitor.html" title="interface in org.objectweb.asm">FieldVisitor</a></td>
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<div class="block">A visitor to visit a Java field.</div>
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<td class="colFirst"><a href="../../../org/objectweb/asm/MethodVisitor.html" title="interface in org.objectweb.asm">MethodVisitor</a></td>
<td class="colLast">
<div class="block">A visitor to visit a Java method.</div>
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<td class="colFirst"><a href="../../../org/objectweb/asm/Opcodes.html" title="interface in org.objectweb.asm">Opcodes</a></td>
<td class="colLast">
<div class="block">Defines the JVM opcodes, access flags and array type codes.</div>
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<th class="colFirst" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><a href="../../../org/objectweb/asm/Attribute.html" title="class in org.objectweb.asm">Attribute</a></td>
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<div class="block">A non standard class, field, method or code attribute.</div>
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<td class="colFirst"><a href="../../../org/objectweb/asm/ByteVector.html" title="class in org.objectweb.asm">ByteVector</a></td>
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<div class="block">A dynamically extensible vector of bytes.</div>
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<td class="colFirst"><a href="../../../org/objectweb/asm/ClassAdapter.html" title="class in org.objectweb.asm">ClassAdapter</a></td>
<td class="colLast">
<div class="block">An empty <a href="../../../org/objectweb/asm/ClassVisitor.html" title="interface in org.objectweb.asm"><code>ClassVisitor</code></a> that delegates to another <a href="../../../org/objectweb/asm/ClassVisitor.html" title="interface in org.objectweb.asm"><code>ClassVisitor</code></a>.</div>
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<td class="colFirst"><a href="../../../org/objectweb/asm/ClassReader.html" title="class in org.objectweb.asm">ClassReader</a></td>
<td class="colLast">
<div class="block">A Java class parser to make a <a href="../../../org/objectweb/asm/ClassVisitor.html" title="interface in org.objectweb.asm"><code>ClassVisitor</code></a> visit an existing class.</div>
</td>
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<td class="colFirst"><a href="../../../org/objectweb/asm/ClassWriter.html" title="class in org.objectweb.asm">ClassWriter</a></td>
<td class="colLast">
<div class="block">A <a href="../../../org/objectweb/asm/ClassVisitor.html" title="interface in org.objectweb.asm"><code>ClassVisitor</code></a> that generates classes in bytecode form.</div>
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<td class="colFirst"><a href="../../../org/objectweb/asm/Label.html" title="class in org.objectweb.asm">Label</a></td>
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<div class="block">A label represents a position in the bytecode of a method.</div>
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<td class="colFirst"><a href="../../../org/objectweb/asm/MethodAdapter.html" title="class in org.objectweb.asm">MethodAdapter</a></td>
<td class="colLast">
<div class="block">An empty <a href="../../../org/objectweb/asm/MethodVisitor.html" title="interface in org.objectweb.asm"><code>MethodVisitor</code></a> that delegates to another
<a href="../../../org/objectweb/asm/MethodVisitor.html" title="interface in org.objectweb.asm"><code>MethodVisitor</code></a>.</div>
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<td class="colFirst"><a href="../../../org/objectweb/asm/Type.html" title="class in org.objectweb.asm">Type</a></td>
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<div class="block">A Java type.</div>
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<h2 title="Package org.objectweb.asm Description">Package org.objectweb.asm Description</h2>
<div class="block">Provides a small and fast bytecode manipulation framework.
<p>
The <a href="http://www.objectweb.org/asm">ASM</a> framework is organized
around the <a href="../../../org/objectweb/asm/ClassVisitor.html" title="interface in org.objectweb.asm"><code>ClassVisitor</code></a>,
<a href="../../../org/objectweb/asm/FieldVisitor.html" title="interface in org.objectweb.asm"><code>FieldVisitor</code></a> and
<a href="../../../org/objectweb/asm/MethodVisitor.html" title="interface in org.objectweb.asm"><code>MethodVisitor</code></a> interfaces, which allow
one to visit the fields and methods of a class, including the bytecode
instructions of each method.
<p>
In addition to these main interfaces, ASM provides a <a href="../../../org/objectweb/asm/ClassReader.html" title="class in org.objectweb.asm"><code>ClassReader</code></a> class, that can parse an
existing class and make a given visitor visit it. ASM also provides
a <a href="../../../org/objectweb/asm/ClassWriter.html" title="class in org.objectweb.asm"><code>ClassWriter</code></a> class, which is
a visitor that generates Java class files.
<p>
In order to generate a class from scratch, only the <a href="../../../org/objectweb/asm/ClassWriter.html" title="class in org.objectweb.asm"><code>ClassWriter</code></a> 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 <a href="../../../org/objectweb/asm/ClassReader.html" title="class in org.objectweb.asm"><code>ClassReader</code></a> class to analyze
the original class, a class modifier, and a <a href="../../../org/objectweb/asm/ClassWriter.html" title="class in org.objectweb.asm"><code>ClassWriter</code></a> to construct the modified class. The class modifier
is just a <a href="../../../org/objectweb/asm/ClassVisitor.html" title="interface in org.objectweb.asm"><code>ClassVisitor</code></a>
that delegates most of the work to another <a href="../../../org/objectweb/asm/ClassVisitor.html" title="interface in org.objectweb.asm"><code>ClassVisitor</code></a>, 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, ASM provides the <a href="../../../org/objectweb/asm/ClassAdapter.html" title="class in org.objectweb.asm"><code>ClassAdapter</code></a> and <a href="../../../org/objectweb/asm/MethodAdapter.html" title="class in org.objectweb.asm"><code>MethodAdapter</code></a>
classes, which implement the <a href="../../../org/objectweb/asm/ClassVisitor.html" title="interface in org.objectweb.asm"><code>ClassVisitor</code></a>
and <a href="../../../org/objectweb/asm/MethodVisitor.html" title="interface in org.objectweb.asm"><code>MethodVisitor</code></a> interfaces by
delegating all work to other visitors. 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 31KB, which is much
more smaller than
the size of the <a href="http://jakarta.apache.org/bcel">BCEL</a> library (350KB
without the class verifier), and than the size of the
<a href="http://serp.sourceforge.net">SERP</a> library (150KB). ASM is also
much more 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)!</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>ASM 1.3</dd></dl>
</div>
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