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javax.ide.util
Class MetaClass  

java.lang.Object
  javax.ide.util.MetaClass

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public final class MetaClass

extends java.lang.Object

A MetaClass describes a real java.lang.Class with the purpose of providing to an IDE class level information, and delaying the loading of that class to the last possible moment: when an instance of the class is required.

A MetaClass binds the java.lang.Class object from its class name using the appropriate class loader. Once the class is bound, new instances can be created using the newInstance() 55 method.

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Field Summary
private  java.lang.ClassLoader	_classLoader
private  java.lang.String	_className

 

Constructor Summary

MetaClass(java.lang.ClassLoader classLoader, java.lang.String className)           Construct a meta class for the specified class name.

 

Method Summary
boolean	equals(java.lang.Object object)           Determine whether this Object is semantically equal to another Object.
(package private)  java.lang.ClassLoader	getClassLoader()           Get the classloader for this meta class.
java.lang.String	getClassName()           Get the fully qualified class name.
int	hashCode()           Get a value that represents this Object, as uniquely as possible within the confines of an int.
java.lang.Object	newInstance()           Creates a new instance of the class represented by this MetaClass object.
java.lang.Class	toClass()           Build the java.lang.Class object from the class name.
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

_className

private java.lang.String _className

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_classLoader

private java.lang.ClassLoader _classLoader

Constructor Detail

MetaClass

public MetaClass(java.lang.ClassLoader classLoader,
                 java.lang.String className)

Construct a meta class for the specified class name.

Method Detail

getClassName

public java.lang.String getClassName()

Get the fully qualified class name. This name is used to create the real java.lang.Class instance.

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getClassLoader

java.lang.ClassLoader getClassLoader()

Get the classloader for this meta class.

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toClass

public java.lang.Class toClass()
                        throws java.lang.ClassNotFoundException

Build the java.lang.Class object from the class name. Uses the right class loader in doing so.

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newInstance

public java.lang.Object newInstance()
                             throws java.lang.InstantiationException,
                                    java.lang.IllegalAccessException,
                                    java.lang.ClassNotFoundException

Creates a new instance of the class represented by this MetaClass object.

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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()).

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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)

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equals

public boolean equals(java.lang.Object object)

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.

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> javax >> ide >> [ util overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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