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org.apache.bcel.util
Class ClassPath  view ClassPath download ClassPath.java

java.lang.Object
  extended byorg.apache.bcel.util.ClassPath
All Implemented Interfaces:
java.io.Serializable

public class ClassPath
extends java.lang.Object
implements java.io.Serializable

Responsible for loading (class) files from the CLASSPATH. Inspired by sun.tools.ClassPath.

Version:
$Id: ClassPath.java 386056 2006-03-15 11:31:56Z tcurdt $

Nested Class Summary
static interface ClassPath.ClassFile
          Contains information about file/ZIP entry of the Java class.
private static class ClassPath.Dir
           
private static class ClassPath.PathEntry
           
private static class ClassPath.Zip
           
 
Field Summary
private  java.lang.String class_path
           
private  ClassPath.PathEntry[] paths
           
static ClassPath SYSTEM_CLASS_PATH
           
 
Constructor Summary
ClassPath()
          Deprecated. Use SYSTEM_CLASS_PATH constant
ClassPath(java.lang.String class_path)
          Search for classes in given path.
 
Method Summary
 boolean equals(java.lang.Object o)
          Determine whether this Object is semantically equal to another Object.
 byte[] getBytes(java.lang.String name)
           
 byte[] getBytes(java.lang.String name, java.lang.String suffix)
           
 ClassPath.ClassFile getClassFile(java.lang.String name)
           
 ClassPath.ClassFile getClassFile(java.lang.String name, java.lang.String suffix)
           
static java.lang.String getClassPath()
          Checks for class path components in the following properties: "java.class.path", "sun.boot.class.path", "java.ext.dirs"
 java.io.InputStream getInputStream(java.lang.String name)
           
 java.io.InputStream getInputStream(java.lang.String name, java.lang.String suffix)
          Return stream for class or resource on CLASSPATH.
 java.lang.String getPath(java.lang.String name)
           
 java.lang.String getPath(java.lang.String name, java.lang.String suffix)
           
private static void getPathComponents(java.lang.String path, java.util.List list)
           
 int hashCode()
          Get a value that represents this Object, as uniquely as possible within the confines of an int.
 java.lang.String toString()
          Convert this Object to a human-readable String.
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

SYSTEM_CLASS_PATH

public static final ClassPath SYSTEM_CLASS_PATH

paths

private ClassPath.PathEntry[] paths

class_path

private java.lang.String class_path
Constructor Detail

ClassPath

public ClassPath(java.lang.String class_path)
Search for classes in given path.


ClassPath

public ClassPath()
Deprecated. Use SYSTEM_CLASS_PATH constant

Search for classes in CLASSPATH.

Method Detail

toString

public java.lang.String toString()
Description copied from class: java.lang.Object
Convert this Object to a human-readable String. There are no limits placed on how long this String should be or what it should contain. We suggest you make it as intuitive as possible to be able to place it into System.out.println() 55 and such.

It is typical, but not required, to ensure that this method never completes abruptly with a java.lang.RuntimeException.

This method will be called when performing string concatenation with this object. If the result is null, string concatenation will instead use "null".

The default implementation returns getClass().getName() + "@" + Integer.toHexString(hashCode()).


hashCode

public int hashCode()
Description copied from class: java.lang.Object
Get a value that represents this Object, as uniquely as possible within the confines of an int.

There are some requirements on this method which subclasses must follow:

  • Semantic equality implies identical hashcodes. In other words, if a.equals(b) is true, then a.hashCode() == b.hashCode() must be as well. However, the reverse is not necessarily true, and two objects may have the same hashcode without being equal.
  • It must be consistent. Whichever value o.hashCode() returns on the first invocation must be the value returned on all later invocations as long as the object exists. Notice, however, that the result of hashCode may change between separate executions of a Virtual Machine, because it is not invoked on the same object.

Notice that since hashCode is used in java.util.Hashtable and other hashing classes, a poor implementation will degrade the performance of hashing (so don't blindly implement it as returning a constant!). Also, if calculating the hash is time-consuming, a class may consider caching the results.

The default implementation returns System.identityHashCode(this)


equals

public boolean equals(java.lang.Object o)
Description copied from class: java.lang.Object
Determine whether this Object is semantically equal to another Object.

There are some fairly strict requirements on this method which subclasses must follow:

  • It must be transitive. If a.equals(b) and b.equals(c), then a.equals(c) must be true as well.
  • It must be symmetric. a.equals(b) and b.equals(a) must have the same value.
  • It must be reflexive. a.equals(a) must always be true.
  • It must be consistent. Whichever value a.equals(b) returns on the first invocation must be the value returned on all later invocations.
  • a.equals(null) must be false.
  • It must be consistent with hashCode(). That is, a.equals(b) must imply a.hashCode() == b.hashCode(). The reverse is not true; two objects that are not equal may have the same hashcode, but that has the potential to harm hashing performance.

This is typically overridden to throw a java.lang.ClassCastException if the argument is not comparable to the class performing the comparison, but that is not a requirement. It is legal for a.equals(b) to be true even though a.getClass() != b.getClass(). Also, it is typical to never cause a java.lang.NullPointerException.

In general, the Collections API (java.util) use the equals method rather than the == operator to compare objects. However, java.util.IdentityHashMap is an exception to this rule, for its own good reasons.

The default implementation returns this == o.


getPathComponents

private static final void getPathComponents(java.lang.String path,
                                            java.util.List list)

getClassPath

public static final java.lang.String getClassPath()
Checks for class path components in the following properties: "java.class.path", "sun.boot.class.path", "java.ext.dirs"


getInputStream

public java.io.InputStream getInputStream(java.lang.String name)
                                   throws java.io.IOException

getInputStream

public java.io.InputStream getInputStream(java.lang.String name,
                                          java.lang.String suffix)
                                   throws java.io.IOException
Return stream for class or resource on CLASSPATH.


getClassFile

public ClassPath.ClassFile getClassFile(java.lang.String name,
                                        java.lang.String suffix)
                                 throws java.io.IOException

getClassFile

public ClassPath.ClassFile getClassFile(java.lang.String name)
                                 throws java.io.IOException

getBytes

public byte[] getBytes(java.lang.String name,
                       java.lang.String suffix)
                throws java.io.IOException

getBytes

public byte[] getBytes(java.lang.String name)
                throws java.io.IOException

getPath

public java.lang.String getPath(java.lang.String name)
                         throws java.io.IOException

getPath

public java.lang.String getPath(java.lang.String name,
                                java.lang.String suffix)
                         throws java.io.IOException