JsonCircularReference class: Difference between revisions
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<!-- JsonCircularReference class --> | <!-- JsonCircularReference class --> | ||
__NOTOC__ | __NOTOC__ | ||
<var>JsonCircularReference</var> [[Exceptions|exceptions]] are thrown by the <var>[[Stringify (Json function)|Stringify]]</var> function in the <var>[[Json class|Json]]</var> class if the <var>Json</var> object leads to a [[Json class#Circular references|circular reference]]. | |||
< | The <var>JsonCircularReference</var> class, like the <var>Json</var> class, is available as of <var class="product">Model 204</var> 7.6. | ||
</ | |||
==The JsonCircularReference methods== | ==The JsonCircularReference methods== | ||
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<li>[[JsonCircularReference methods syntax]] is a single page that contains the syntax diagrams of all the methods in the class. </li> | <li>[[JsonCircularReference methods syntax]] is a single page that contains the syntax diagrams of all the methods in the class. </li> | ||
</ul> | </ul> | ||
==New constructor== | ==New constructor== | ||
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====Syntax terms==== | ====Syntax terms==== | ||
<table | <table> | ||
<tr><th>%JsonCircularReference </th> | <tr><th>%JsonCircularReference </th> | ||
<td>A reference to an instance of a <var>JsonCircularReference</var> object. | <td>A reference to an instance of a <var>JsonCircularReference</var> object. | ||
</td></tr> | </td></tr> | ||
<tr><th><var>[%(JsonCircularReference):]</var></th><td>The class name in parentheses denotes a <var>[[Notation conventions for methods#Constructors|Constructor]] | <tr><th><var>[%(JsonCircularReference):]</var></th> | ||
<td>The class name in parentheses denotes a <var>[[Notation conventions for methods#Constructors|Constructor]]</var>.</td></tr> | |||
</table> | </table> | ||
===Usage notes=== | ===Usage notes=== | ||
< | <p> | ||
The following example catches a circular reference exception and prints the string where the circular reference occurs. | |||
<p class="code">% | </p> | ||
<p class="code">b | |||
% | %jsonCircRefError is object JsonCircularReference | ||
%jsa is object json | |||
% | %jsb is object json | ||
%jsc is object json | |||
%jsa = array('a') | |||
%jsb = array('b') | |||
%jsc = array('c') | |||
%jsa:add(%jsb) | |||
%jsb:add(%jsc) | |||
%jsc:add(%jsa) | |||
try | |||
print %jsa:stringify | |||
catch JsonCircularReference to %jsonCircRefError | |||
print 'Caught Json Circular Reference Error' | |||
print %jsa:tostring | |||
end try | |||
end | |||
</p> | </p> | ||
Running this example results in: | |||
<p class="output">Caught Json Circular Reference Error | |||
["a",["b",["c",[Circular]]]] | |||
</p> | |||
[[Category:System exception classes]] | [[Category:System exception classes]] | ||
Latest revision as of 00:44, 13 May 2015
JsonCircularReference exceptions are thrown by the Stringify function in the Json class if the Json object leads to a circular reference.
The JsonCircularReference class, like the Json class, is available as of Model 204 7.6.
The JsonCircularReference methods
The following are the available JsonCircularReference class methods.
| Method | Description |
|---|---|
| New | Create a new JsonCircularReference object |
The methods in the class are described in the subsections that follow. In addition:
- Notation conventions for methods has information about the conventions followed.
- JsonCircularReference methods syntax is a single page that contains the syntax diagrams of all the methods in the class.
New constructor
Create a new JsonCircularReference object (JsonCircularReference class)
This Constructor generates an instance of a JsonCircularReference exception. The New method format is as follows:
Syntax
%jsonCircularReference = [%(JsonCircularReference):]New
Syntax terms
| %JsonCircularReference | A reference to an instance of a JsonCircularReference object. |
|---|---|
| [%(JsonCircularReference):] | The class name in parentheses denotes a Constructor. |
Usage notes
The following example catches a circular reference exception and prints the string where the circular reference occurs.
b %jsonCircRefError is object JsonCircularReference %jsa is object json %jsb is object json %jsc is object json %jsa = array('a') %jsb = array('b') %jsc = array('c') %jsa:add(%jsb) %jsb:add(%jsc) %jsc:add(%jsa) try print %jsa:stringify catch JsonCircularReference to %jsonCircRefError print 'Caught Json Circular Reference Error' print %jsa:tostring end try end
Running this example results in:
Caught Json Circular Reference Error ["a",["b",["c",[Circular]]]]