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https://issues.apache.org/jira/browse/IMAGING-159?focusedWorklogId=631314&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-631314
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ASF GitHub Bot logged work on IMAGING-159:
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Author: ASF GitHub Bot
Created on: 29/Jul/21 19:51
Start Date: 29/Jul/21 19:51
Worklog Time Spent: 10m
Work Description: kinow commented on a change in pull request #116:
URL: https://github.com/apache/commons-imaging/pull/116#discussion_r679442463
##########
File path: src/main/java/org/apache/commons/imaging/ImageParser.java
##########
@@ -79,25 +78,18 @@
* that the documentation is perfect, especially in the more obscure
* and specialized areas of implementation.
*
- * <h3>The "Map params" argument</h3>
+ * <h3>The "params" argument</h3>
*
- * Many of the methods specified by this class accept an argument of
- * type Map giving a list of parameters to be used when processing an
- * image. For example, some of the output formats permit the specification
+ * <p>Many of the methods specified by this class accept an argument of
+ * type {@code T} defining the parameters to be used when
+ * processing an image. For example, some of the output formats permit
* of different kinds of image compression or color models. Some of the
* reading methods permit the calling application to require strict
- * format compliance. In many cases, however, an application will not
- * require the use of this argument. While some of the ImageParser
- * implementations check for (and ignore) null arguments for this parameter,
- * not all of them do (at least not at the time these notes were written).
- * Therefore, a prudent programmer will always supply an valid, though
- * empty instance of a Map implementation when calling such methods.
- * Generally, the java HashMap class is useful for this purpose.
+ * format compliance.</p>
*
- * <p>Additionally, developers creating or enhancing classes derived
- * from ImageParser are encouraged to include such checks in their code.
+ * @param <T> type of parameters used by this image parser
*/
-public abstract class ImageParser extends BinaryFileParser {
+public abstract class ImageParser<T extends ImagingParameters> extends
BinaryFileParser {
Review comment:
Good point @gwlucastrig . I will have a look to remember why I extended
the tiff class.
As for the generics, maybe we can find a compromise between our two options,
even if it requires further changes (e.g. rethink the Imaging class for
example). Or maybe after reviewing this jpeg - tiff parent relationship we may
simplify this code more and have some other ideas.
Thanks!!!
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Issue Time Tracking
-------------------
Worklog Id: (was: 631314)
Time Spent: 8.5h (was: 8h 20m)
> There should be a Parameters class
> ----------------------------------
>
> Key: IMAGING-159
> URL: https://issues.apache.org/jira/browse/IMAGING-159
> Project: Commons Imaging
> Issue Type: Improvement
> Components: imaging.*
> Affects Versions: 1.0-alpha2
> Reporter: Benedikt Ritter
> Assignee: Bruno P. Kinoshita
> Priority: Major
> Labels: github
> Fix For: 1.0-alpha3
>
> Time Spent: 8.5h
> Remaining Estimate: 0h
>
> Currently options for image I/O are defined as Maps. The leads to the problem
> that our code has to validate parameter types when they are used:
> {code:java}
> final Object value = params.get(PARAM_KEY_COMPRESSION);
> if (value != null) {
> if (!(value instanceof Number)) {
> throw new ImageWriteException(
> "Invalid compression parameter, must be numeric: "
> + value);
> }
> compression = ((Number) value).intValue();
> }
> {code}
> This can be simplified if we define a Parameters class that provides
> additional methods like {{public int getInt(String key)}}. The implementation
> could then look up the value from the map through an exception if it is null
> or not a number.
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