com.lizardtech.djvu
Class DjVuObject

java.lang.Object
  com.lizardtech.djvu.DjVuObject

All Implemented Interfaces:

DjVuInterface

Direct Known Subclasses:

DataPool, DjVmDir, DjVuAnno, DjVuInfo, DjVuPage, DjVuText, Document, GMap, GRect, IWPixmap, JB2Codec, JB2Dict, Palette, Rect, ZPCodec

public class DjVuObject
extends java.lang.Object
implements DjVuInterface

This is a basic implimentation of the DjVuInterface. Children should have a static method for creating an instance of the class using the referenced object to initialize DjVuObjects storage.

Version:

$Revision: 1.10 $

Author:

Bill C. Riemers

Field Summary

static boolean

hasReferences This flag indicates if references are available.

Constructor Summary

DjVuObject()

Method Summary

static void	checkLockTime(long lockTime, long maxTime)
static DjVuInterface	create(DjVuOptions options, java.lang.Class bestClass, java.lang.Class defaultClass) Creates the desired class.
static DjVuInterface	create(DjVuOptions options, java.lang.Class bestClass, java.lang.String className) Creates the desired class.
static java.lang.Object	createSoftReference(java.lang.Object value, java.lang.Object defaultValue) Create a new SoftReference, if supported.
static java.lang.Object	createWeakReference(java.lang.Object value, java.lang.Object defaultValue) Create a new WeakReference, if supported.
DjVuOptions	getDjVuOptions() Query the DjVuOptions used by this object.
static java.lang.Object	getFromReference(java.lang.Object value) Retrieve the value from a reference.
static java.lang.Object	invoke(java.lang.reflect.Method method, java.lang.Object o, java.lang.Object[] args) This is a wrapper for method.invoke that catches and reports exceptions.
void	setDjVuOptions(DjVuOptions options) Set the DjVuOptions to be used by this object.

Methods inherited from class java.lang.Object

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

Field Detail

hasReferences

public static final boolean hasReferences

This flag indicates if references are available.

Constructor Detail

DjVuObject

public DjVuObject()

Method Detail

setDjVuOptions

public void setDjVuOptions(DjVuOptions options)

Set the DjVuOptions to be used by this object.

Specified by:

setDjVuOptions in interface DjVuInterface

Parameters:

options - DjVuOptions to use.

getDjVuOptions

public DjVuOptions getDjVuOptions()

Query the DjVuOptions used by this object.

Specified by:

getDjVuOptions in interface DjVuInterface

Returns:

DjVuOptions in use

getFromReference

public static java.lang.Object getFromReference(java.lang.Object value)

Retrieve the value from a reference. If the specified object is not a reference then that value will be returned.

Parameters:

value - The reference to query.

Returns:

The value contained by the reference.

create

public static DjVuInterface create(DjVuOptions options,
                                   java.lang.Class bestClass,
                                   java.lang.String className)

Creates the desired class. bestClass is not null, it will be created. Otherwise the named class will be created. If the creation fails, a null will be returned.

Parameters:

options - the DjVuOptions instance the new object should use.

bestClass - The class we wish to create.

className - The name of the class to create as default.

Returns:

the newly created object

create

public static DjVuInterface create(DjVuOptions options,
                                   java.lang.Class bestClass,
                                   java.lang.Class defaultClass)

Creates the desired class. bestClass is not null, it will be created. Otherwise the named class will be created. If the creation fails, a null will be returned.

Parameters:

options - the DjVuOptions instance the new object should use.

bestClass - The class we wish to create.

defaultClass - The class to create as default.

Returns:

the newly created object

createSoftReference

public static java.lang.Object createSoftReference(java.lang.Object value,
                                                   java.lang.Object defaultValue)

Create a new SoftReference, if supported.

Parameters:

value - The value to wrap in a soft reference.

defaultValue - The value to return if soft references are not supported.

Returns:

The soft reference, or default value.

createWeakReference

public static java.lang.Object createWeakReference(java.lang.Object value,
                                                   java.lang.Object defaultValue)

Create a new WeakReference, if supported.

Parameters:

value - The value to wrap in a weak reference.

defaultValue - The value to return if weak references are not supported.

Returns:

The weak reference, or default value.

invoke

public static java.lang.Object invoke(java.lang.reflect.Method method,
                                      java.lang.Object o,
                                      java.lang.Object[] args)

This is a wrapper for method.invoke that catches and reports exceptions.

Parameters:

method - class method to invoke

o - the object to invoke the method on

args - the arguments to send to the method

Returns:

the method.invoke return value or null

checkLockTime

public static void checkLockTime(long lockTime,
                                 long maxTime)