com.itextpdf.pdfoptimizer.handlers.fontduplication

Class PdfDictionaryEqualityCalculator

java.lang.Object

com.itextpdf.pdfoptimizer.handlers.fontduplication.PdfDictionaryEqualityCalculator

public class PdfDictionaryEqualityCalculator
extends Object

Class is used for flexible comparison of two instances of PdfDictionary. It allows to provide a list of rules. According to the rules dictionary will be processed appropriately before hash or equality calculation.

According to the contract of IValueUpdateRule it is expected that rule applying should not change the internal state of the objects included as values into original PdfDictionary. Modified copies of the objects will be put into dictionary instead.

Constructor Summary

Constructors

Constructor and Description
PdfDictionaryEqualityCalculator(List<IValueUpdateRule> rules) Creates a new instance of the class.

Method Summary

Modifier and Type	Method and Description
boolean	areEqual(com.itextpdf.kernel.pdf.PdfDictionary dict1, com.itextpdf.kernel.pdf.PdfDictionary dict2) Applies rules passed to constructor PdfDictionaryEqualityCalculator(List) to both provided dictionaries and then compares them using EqualityUtils.areEqual(PdfObject, PdfObject) method.
int	getHashCode(com.itextpdf.kernel.pdf.PdfDictionary dict) Applies rules passed to constructor PdfDictionaryEqualityCalculator(List) to provided dictionary and then calculates its hash code using EqualityUtils.getHashCode(PdfObject) method.

Methods inherited from class java.lang.Object

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

Constructor Detail

PdfDictionaryEqualityCalculator

public PdfDictionaryEqualityCalculator(List<IValueUpdateRule> rules)

Creates a new instance of the class.

Parameters:

rules - is a list of rules for PdfDictionary processing

Method Detail

getHashCode

public int getHashCode(com.itextpdf.kernel.pdf.PdfDictionary dict)

Applies rules passed to constructor PdfDictionaryEqualityCalculator(List) to provided dictionary and then calculates its hash code using EqualityUtils.getHashCode(PdfObject) method.

For the same set of rules two instances will have equal hashCode if they are considered as equal by areEqual(PdfDictionary, PdfDictionary) method.

Parameters:

dict - is a dictionary whose content-based hash code has to be calculated

Returns:

calculated content-based hash code for provided dictionary

areEqual

public boolean areEqual(com.itextpdf.kernel.pdf.PdfDictionary dict1,
                        com.itextpdf.kernel.pdf.PdfDictionary dict2)

Applies rules passed to constructor PdfDictionaryEqualityCalculator(List) to both provided dictionaries and then compares them using EqualityUtils.areEqual(PdfObject, PdfObject) method.

For the same set of rules if two instances are considered as equal they should also have equals hashCodes calculated by getHashCode(PdfDictionary) method.

Parameters:

dict1 - is the first dictionary to compare

dict2 - is the second dictionary to compare

Returns:

true if dictionaries are equal and false otherwise.