edu.umd.cs.findbugs.ba
Class MethodHash

java.lang.Object
  edu.umd.cs.findbugs.ba.MethodHash

All Implemented Interfaces:

java.lang.Comparable<MethodHash>

public class MethodHash
extends java.lang.Object
implements java.lang.Comparable<MethodHash>

Compute a hash of the bytecode for given method. This can find methods which have not been changed other than accessing different constant pool entries.

Author:

David Hovemeyer

Field Summary

static java.lang.String

METHOD_HASH_ELEMENT_NAME

Constructor Summary

MethodHash()
Constructor.

MethodHash(java.lang.String methodName, java.lang.String methodSig, boolean isStatic, byte[] hash)
Constructor.

Method Summary

static int	compareHashes(byte[] a, byte[] b)
int	compareTo(MethodHash other)
MethodHash	computeHash(org.apache.bcel.classfile.Method method) Compute hash on given method.
boolean	equals(java.lang.Object o)
byte[]	getMethodHash() Get the computed method hash.
java.lang.String	getMethodName()
java.lang.String	getMethodSig()
int	hashCode()
boolean	isSameHash(MethodHash other) Return whether or not this method hash has the same value as the one given.
boolean	isStatic()

Methods inherited from class java.lang.Object

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

Field Detail

METHOD_HASH_ELEMENT_NAME

public static final java.lang.String METHOD_HASH_ELEMENT_NAME

See Also:

Constant Field Values

Constructor Detail

MethodHash

public MethodHash()

Constructor. computeHash(Method) must be used to initialize the contents.

MethodHash

public MethodHash(java.lang.String methodName,
                  java.lang.String methodSig,
                  boolean isStatic,
                  byte[] hash)

Constructor.

Parameters:

methodName - method name

methodSig - method signature

isStatic - true if the method is static, false if not

hash - the pre-computed hash

Method Detail

getMethodName

public java.lang.String getMethodName()

Returns:

Returns the method name.

getMethodSig

public java.lang.String getMethodSig()

Returns:

Returns the method signature.

isStatic

public boolean isStatic()

Returns:

Returns whether the method is static.

getMethodHash

public byte[] getMethodHash()

Get the computed method hash.

Returns:

the method hash

computeHash

public MethodHash computeHash(org.apache.bcel.classfile.Method method)

Compute hash on given method.

Parameters:

method - the method

Returns:

this object

isSameHash

public boolean isSameHash(MethodHash other)

Return whether or not this method hash has the same value as the one given.

Parameters:

other - another MethodHash

Returns:

true if the hash values are the same, false if not

compareTo

public int compareTo(MethodHash other)

Specified by:

compareTo in interface java.lang.Comparable<MethodHash>

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

compareHashes

public static int compareHashes(byte[] a,
                                byte[] b)