/*

     File: LazyDataTextStorage.m

 Abstract:     This file contains one class:

 LazyDataTextStorage: Subclass of NSTextStorage which treats its contents as immutable, allowing for lazy loading.

 But used to contain another:

 LazyDataString: Subclass of NSString for displaying a hex and text dump of binary data. Most of its code is now in HexAndASCIIString.

  Version: 1.2

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 redistribute this Apple software.

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 Neither the name, trademarks, service marks or logos of Apple Inc. may

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 expressly stated in this notice, no other rights or licenses, express or

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 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

 THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS

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 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

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 */

#import "LazyDataTextStorage.h"

@implementation LazyDataTextStorage

- (id)init {

    if (self = [super init]) {

        myString = [@"" copy];

        myAttributes = [[NSDictionary dictionary] copy];

    }

    return self;

}

- (void)dealloc {

    [myString release];

    [myAttributes release];

    [super dealloc];

}

/* These two methods are the way to change the string and attributes of this text storage

We assume non-editable backing store; in addition, the same attributes apply to the whole string.

*/

- (void)setAttributes:(NSDictionary *)attrs {

    if (myAttributes != attrs) {

        [myAttributes release];

        myAttributes = [attrs retain];

        [self edited:NSTextStorageEditedAttributes range:NSMakeRange(0, [self length]) changeInLength:0];

    }

}

- (void)setString:(NSString *)string {

    if (myString != string) {

        NSUInteger origLength = [self length];

        [myString release];

        myString = [string retain];

        [self edited:NSTextStorageEditedCharacters range:NSMakeRange(0, origLength) changeInLength:[self length] - origLength];

    }

}

- (NSString *)string {

    return myString;

}

/* Primitve for returning the attributes; we just have a fixed set, so the result is easy...

*/

- (NSDictionary *)attributesAtIndex:(NSUInteger)location effectiveRange:(NSRangePointer)range {

    if (range) *range = NSMakeRange(0, [self length]);

    return myAttributes;

}

/* The actual mutable primitives, the two below, don't do anything. This means this text storage is really not editable. We generate a warning just to  make sure these are never called...

*/

- (void)replaceCharactersInRange:(NSRange)range withString:(NSString *)str {

    NSLog (@"Attempt to edit characters!");

}

- (void)setAttributes:(NSDictionary *)attrs range:(NSRange)range {

    NSLog (@"Attempt to edit attributes!");

}

/* Do nothing; because we're not editable, no need to try to fix (and, in fact, trying to fix attributes might cause trouble if the fixing causes some changes. Note that what this means is we need to make sure that the attributes assigned to the text are always valid.

*/

- (void)fixAttributesInRange:(NSRange)range {

}

@end