mvel

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Java Source Code / Java Documentation » Scripting » mvel 
MVEL
License:Apache Software License
URL:http://mvel.codehaus.org/
Description:MVEL is a powerful expression language for Java-based applications.
Package NameComment
org.mvel
org.mvel.asm Provides a small and fast bytecode manipulation framework.

The ASM framework is organized around the {@link org.mvel.asm.ClassVisitor ClassVisitor}, {@link org.mvel.asm.FieldVisitor FieldVisitor} and {@link org.mvel.asm.MethodVisitor MethodVisitor} interfaces, which allow one to visit the fields and methods of a class, including the bytecode instructions of each method.

In addition to these main interfaces, ASM provides a {@link org.mvel.asm.ClassReader ClassReader} class, that can parse an existing class and make a given visitor visit it. ASM also provides a {@link org.mvel.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.mvel.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. See the "helloworld" example in the ASM distribution for more details about class generation.

In order to modify existing classes, one must use a {@link org.mvel.asm.ClassReader ClassReader} class to analyze the original class, a class modifier, and a {@link org.mvel.asm.ClassWriter ClassWriter} to construct the modified class. The class modifier is just a {@link org.mvel.asm.ClassVisitor ClassVisitor} that delegates most of the work to another {@link org.mvel.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, ASM provides the {@link org.mvel.asm.ClassAdapter ClassAdapter} and {@link org.mvel.asm.MethodAdapter MethodAdapter} classes, which implement the {@link org.mvel.asm.ClassVisitor ClassVisitor} and {@link org.mvel.asm.MethodVisitor MethodVisitor} interfaces by delegating all work to other visitors. See the "adapt" example in the ASM distribution for more details about class modification.

The size of the core ASM library, asm.jar, is only 42KB, which is much smaller than the size of the BCEL library (504KB), and than the size of the SERP 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 test/perf directory in the ASM distribution)! @since ASM 1.3

org.mvel.ast
org.mvel.ast.cache
org.mvel.bsf
org.mvel.compiler
org.mvel.conversion
org.mvel.debug
org.mvel.integration
org.mvel.integration.impl
org.mvel.jdk14testproj
org.mvel.jsr223
org.mvel.math
org.mvel.optimizers
org.mvel.optimizers.impl.asm
org.mvel.optimizers.impl.refl
org.mvel.optimizers.impl.refl.collection
org.mvel.sh
org.mvel.sh.command.basic
org.mvel.sh.command.file
org.mvel.sh.text
org.mvel.tests
org.mvel.tests.bsf
org.mvel.tests.bsf.model
org.mvel.tests.experimental
org.mvel.tests.main
org.mvel.tests.main.res
org.mvel.tests.perftests
org.mvel.tests.special
org.mvel.units
org.mvel.util
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