org.netbeans.lib.profiler.heap.JavaClass Maven / Gradle / Ivy
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package org.netbeans.lib.profiler.heap;
import java.util.Collection;
import java.util.List;
/**
* This class represents java.lang.Class instances on the heap.
* @author Tomas Hurka
*/
public interface JavaClass extends Type {
//~ Methods ------------------------------------------------------------------------------------------------------------------
/**
* Returns a value object that reflects the specified static field of the class
* represented by this {@link JavaClass} object.
* The name parameter is a String that specifies the simple name of the desired static field.
*
* Speed: normal
* @param name the name of the field
* @return the value for the specified static field in this class.
* If a static field with the specified name is not found null is returned.
* If the field.getType() is {@link Type} object {@link Instance} is returned as field value,
* for primitive types its corresponding object wrapper (Boolean, Integer, Float, etc.) is returned.
*/
public Object getValueOfStaticField(String name);
/**
* returns the size of all instances in bytes. For non array classes
* this is computed as getInstancesCount()*getInstanceSize().
* Instance size of all instances is summed for arrays.
*
* Speed: normal
* @return the size of all instances in bytes
*/
long getAllInstancesSize();
/**
* returns true if this JavaClass represents array (for example: java.lang.String[]).
*
* Speed: fast
* @return true if this class represents array, false otherwise
*/
boolean isArray();
/**
* returns {@link Instance} representing class loader of this class.
*
* Speed: fast
* @return class loader
*/
Instance getClassLoader();
/**
* returns List of instance fields of this {@link JavaClass}.
*
* Speed: normal
* @return list of {@link Field} instance fields
*/
List getFields();
/**
* returns the size of the {@link Instance} in bytes if this JavaClass does
* not represent array. For arrays -1 is returned
*
* Speed: fast
* @return returns the size of the {@link Instance} in bytes, for arrays -1 is returned.
*/
int getInstanceSize();
/**
* computes the list of all {@link Instance} of this class.
* The instances are ordered according to {@link Instance#getInstanceNumber()}
*
* Speed: slow
* @return list {@link Instance} of instances
*/
List getInstances();
/**
* gets number of instances of this class.
*
* Speed: first invocation is slow, all subsequent invocations are fast
* @return number of instances
*/
int getInstancesCount();
/**
* gets sum of retained sizes of all class instances.
*
* Speed: first invocation is slow, all subsequent invocations are fast
* @return sum of retained sizes of all class instances
*/
long getRetainedSizeByClass();
/**
* gets unique (in whole heap) ID of this {@link JavaClass}.
*
* Speed: fast
* @return ID of this {@link JavaClass}
*/
long getJavaClassId();
/**
* return human readable name of the class.
* Innerclasses are separated by $. Anonymous classes uses $1 $2 etc.
* Arrays uses [] after the class or primitive type name
*
* Speed: fast
* @return name of the class
*/
String getName();
/**
* Returns a {@link Field} object that reflects the specified field of the class
* represented by this {@link JavaClass} object.
* The name parameter is a String that specifies the simple name of the desired field.
*
* Speed: normal
* @param name the name of the field
* @return the {@link Field} object for the specified field in this class.
* If a field with the specified name is not found null is returned.
*/
/* public Field getField(String name); */
/**
* computes the list of instance field values. The order is fields of this class followed by
* super class, etc.
*
* Speed: normal
* @return list of {@link FieldValue} instance field values.
*/
List getStaticFieldValues();
/**
* returns all subclasses of this class. This method works recursively
* so it returns also subclasses of subclasses etc.
*
* Speed: slow
* @return returns the {@link Collection} of {@link JavaClass}.
*/
Collection getSubClasses();
/**
* returns {@link JavaClass} representing super class of this class.
*
* Speed: fast
* @return super class (super class of java.lang.Object is null)
*/
JavaClass getSuperClass();
}