Package EDU.purdue.cs.bloat.file

Class ClassFileLoader

java.lang.Object

EDU.purdue.cs.bloat.file.ClassFileLoader

All Implemented Interfaces:

ClassInfoLoader

Direct Known Subclasses:

JarFileCommitter

public class ClassFileLoader
extends java.lang.Object
implements ClassInfoLoader

ClassFileLoder provides an interface for loading classes from files. The actual loading is done by the ClassFile itself.

Classes may be specified by their full package name (java.lang.String), or by the name of their class file (myclasses/Test.class). The class path may contain directories or Zip or Jar files. Any classes that are written back to disk ("committed") are placed in the output directory.

Field Summary

Fields

Modifier and Type	Field	Description
static boolean	DEBUG
static boolean	USE_SYSTEM_CLASSES

Constructor Summary

Constructors

Constructor	Description
ClassFileLoader()	Constructor.

Method Summary

Modifier and Type	Method	Description
void	appendClassPath(java.lang.String morePath)	Adds to the classpath (CLASSPATH = CLASSPATH + morePath).
void	done()	Signifies that we are done with this ClassFileLoader
java.lang.String	getClassPath()	Returns the path used to search for class files.
ClassInfo	loadClass(java.lang.String name)	Loads the class with the given name.
ClassInfo[]	loadClassesFromZipFile(java.util.zip.ZipFile zipFile)	Loads all of the classes that are contained in a zip (or jar) file.
ClassInfo	newClass(int modifiers, int classIndex, int superClassIndex, int[] interfaceIndexes, java.util.List constants)	Creates a new class or interface.
java.io.File	outputDir()	Get the directory into which commited class files should be written.
java.io.OutputStream	outputStreamFor(ClassInfo info)	Returns an OutputStream to which a class file should be written.
protected java.io.OutputStream	outputStreamFor(java.lang.String name)	Returns an OutputStream to which somed named entity is written.
void	prependClassPath(java.lang.String morePath)	Adds to the classpath (CLASSPATH = morePath + CLASSPATH).
void	setClassPath(java.lang.String classpath)	Sets the classpath.
void	setOutputDir(java.io.File dir)	Set the directory into which commited class files should be written.
void	setVerbose(boolean verbose)
void	writeEntry(byte[] bytes, java.lang.String name)	Writes a bunch of bytes to an output entry with the given name.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEBUG

public static boolean DEBUG

USE_SYSTEM_CLASSES

public static boolean USE_SYSTEM_CLASSES

Constructor Detail

ClassFileLoader

public ClassFileLoader()

Constructor. The classpath initially consists of the contents of the java.class.path and sun.boot.class.path system properties.

Method Detail

setVerbose

public void setVerbose(boolean verbose)

setClassPath

public void setClassPath(java.lang.String classpath)

Sets the classpath.

appendClassPath

public void appendClassPath(java.lang.String morePath)

Adds to the classpath (CLASSPATH = CLASSPATH + morePath).

prependClassPath

public void prependClassPath(java.lang.String morePath)

Adds to the classpath (CLASSPATH = morePath + CLASSPATH).

getClassPath

public java.lang.String getClassPath()

Returns the path used to search for class files.

loadClassesFromZipFile

public ClassInfo[] loadClassesFromZipFile(java.util.zip.ZipFile zipFile)
                                   throws java.lang.ClassNotFoundException

Loads all of the classes that are contained in a zip (or jar) file. Returns an array of the ClassInfos for the classes in the zip file.

Throws:

java.lang.ClassNotFoundException

newClass

public ClassInfo newClass(int modifiers,
                          int classIndex,
                          int superClassIndex,
                          int[] interfaceIndexes,
                          java.util.List constants)

Description copied from interface: ClassInfoLoader

Creates a new class or interface.

Specified by:

newClass in interface ClassInfoLoader

Parameters:

modifiers - The modifiers describing the newly-created class

classIndex - The index of the name of the newly-created class in its constant pool

superClassIndex - The index of the name of the newly-created class's superclass in its constant pool

interfaceIndexes - The indexes of the names of the interfaces that the newly-created class implements

constants - The constant pool for the newly created class (a list of Constants).

loadClass

public ClassInfo loadClass(java.lang.String name)
                    throws java.lang.ClassNotFoundException

Loads the class with the given name. Searches the class path, including zip files, for the class and then returns a data stream for the class file.

Specified by:

loadClass in interface ClassInfoLoader

Parameters:

name - The name of the class to load, including the package name.

Returns:

A ClassInfo for the class.

Throws:

java.lang.ClassNotFoundException - The class cannot be found in the class path.

See Also:

ClassInfo

setOutputDir

public void setOutputDir(java.io.File dir)

Set the directory into which commited class files should be written.

Parameters:

dir - The directory.

outputDir

public java.io.File outputDir()

Get the directory into which commited class files should be written.

writeEntry

public void writeEntry(byte[] bytes,
                       java.lang.String name)
                throws java.io.IOException

Writes a bunch of bytes to an output entry with the given name.

Throws:

java.io.IOException

outputStreamFor

public java.io.OutputStream outputStreamFor(ClassInfo info)
                                     throws java.io.IOException

Returns an OutputStream to which a class file should be written.

Specified by:

outputStreamFor in interface ClassInfoLoader

Throws:

java.io.IOException

outputStreamFor

protected java.io.OutputStream outputStreamFor(java.lang.String name)
                                        throws java.io.IOException

Returns an OutputStream to which somed named entity is written. Any forward slashes in the name are replaced by File.separatorChar.

Throws:

java.io.IOException

done

public void done()
          throws java.io.IOException

Signifies that we are done with this ClassFileLoader

Throws:

java.io.IOException