Package edu.umd.cs.findbugs.ba

Class MethodHash

java.lang.Object

edu.umd.cs.findbugs.ba.MethodHash

All Implemented Interfaces:

Comparable<MethodHash>

public class MethodHash
extends Object
implements 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

Fields

Modifier and Type	Field	Description
static final String	METHOD_HASH_ELEMENT_NAME

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
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(Object o)
byte[]	getMethodHash()	Get the computed method hash.
String	getMethodName()
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 Details

METHOD_HASH_ELEMENT_NAME

public static final String METHOD_HASH_ELEMENT_NAME

See Also:

• Constant Field Values

Constructor Details

MethodHash

public MethodHash()

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

MethodHash

public MethodHash(String methodName,
 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 Details

getMethodName

public String getMethodName()

Returns:

Returns the method name.

getMethodSig

public 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 Comparable<MethodHash>

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

compareHashes

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