11:48 a.m.
Provide utility to check if Type is assignable to another Type
--------------------------------------------------------------
Key: WELDX-188
URL: https://jira.jboss.org/browse/WELDX-188
Project: Weld Extensions
Issue Type: Feature Request
Reporter: Dan Allen
Priority: Minor
Fix For: 1.0.0.Beta2
Often times when writing an extension, you need to know if one Type is assignable from
another Type. This is a more sophisticated version of Class#isAssignableFrom(Class) which
takes into account paramaterized types.
given
parameterized type Bean<N extends Number>
then
type Bean<Number> is assignable from type Bean<Integer>
One area where this is useful is when checking if a bean type is more specific than
another bean type. It's not sufficient to assume the bean type is a simple class.
Something similar to what is provided by:
http://google-gson.googlecode.com/svn-history/r442/trunk/gson/src/main/ja...
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12:32 p.m.
New subject: [JBoss JIRA] Commented: (WELDX-188) Provide utility to check if Type is assignable to another Type
[
https://jira.jboss.org/browse/WELDX-188?page=com.atlassian.jira.plugin.sy...
]
Dan Allen commented on WELDX-188:
---------------------------------
TypeToken has a shortcoming in that isAssignableFrom is looking for an exact match. It
should be considering whether the underlying class for each parameter is assignable to the
matching parameter on the other type.
Provide utility to check if Type is assignable to another Type
--------------------------------------------------------------
Key: WELDX-188
URL: https://jira.jboss.org/browse/WELDX-188
Project: Weld Extensions
Issue Type: Feature Request
Reporter: Dan Allen
Priority: Minor
Fix For: 1.0.0.Beta2
Often times when writing an extension, you need to know if one Type is assignable from
another Type. This is a more sophisticated version of Class#isAssignableFrom(Class) which
takes into account paramaterized types.
given
parameterized type Bean<N extends Number>
then
type Bean<Number> is assignable from type Bean<Integer>
One area where this is useful is when checking if a bean type is more specific than
another bean type. It's not sufficient to assume the bean type is a simple class.
Something similar to what is provided by:
http://google-gson.googlecode.com/svn-history/r442/trunk/gson/src/main/ja...
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1:29 p.m.
New subject: [JBoss JIRA] Commented: (WELDX-188) Provide utility to check if Type is assignable to another Type
[
https://jira.jboss.org/browse/WELDX-188?page=com.atlassian.jira.plugin.sy...
]
Dan Allen commented on WELDX-188:
---------------------------------
Ah, parameters are strictly typed. So while the exact still shouldn't be exact,
parameter types do have to be equal.
I'll provide three test cases that should pass.
Type generalType1 = new TypeLiteral<Instance<? extends Number>>()
{}.getType();
Type specificType1 = new TypeLiteral<Instance<Integer>>() {}.getType();
Assert.assertTrue(TypeHelper.get(generalType1).isAssignableFrom(specificType1));
Type generalType2 = new TypeLiteral<Provider<? extends Number>>()
{}.getType();
Type specificType2 = new TypeLiteral<Instance<Integer>>() {}.getType();
Assert.assertTrue(TypeHelper.get(generalType2).isAssignableFrom(specificType2));
Type generalType3 = new TypeLiteral<Number>() {}.getType();
Type specificType3 = new TypeLiteral<Integer>() {}.getType();
Assert.assertTrue(TypeHelper.get(generalType3).isAssignableFrom(specificType3));
Being able to shove off dealing with the specifics of the various types is quite helpful.
Provide utility to check if Type is assignable to another Type
--------------------------------------------------------------
Key: WELDX-188
URL: https://jira.jboss.org/browse/WELDX-188
Project: Weld Extensions
Issue Type: Feature Request
Reporter: Dan Allen
Priority: Minor
Fix For: 1.0.0.Beta2
Often times when writing an extension, you need to know if one Type is assignable from
another Type. This is a more sophisticated version of Class#isAssignableFrom(Class) which
takes into account paramaterized types.
given
parameterized type Bean<N extends Number>
then
type Bean<Number> is assignable from type Bean<Integer>
One area where this is useful is when checking if a bean type is more specific than
another bean type. It's not sufficient to assume the bean type is a simple class.
Something similar to what is provided by:
http://google-gson.googlecode.com/svn-history/r442/trunk/gson/src/main/ja...
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9:21 a.m.
New subject: [JBoss JIRA] Commented: (WELDX-188) Provide utility to check if Type is assignable to another Type
[
https://jira.jboss.org/browse/WELDX-188?page=com.atlassian.jira.plugin.sy...
]
Pete Muir commented on WELDX-188:
---------------------------------
Weld already has an impl of this, we can port it to WeldX.
What circumstances do you need this in? (Wondering as I have a feeling you shouldn't
need this).
Provide utility to check if Type is assignable to another Type
--------------------------------------------------------------
Key: WELDX-188
URL: https://jira.jboss.org/browse/WELDX-188
Project: Weld Extensions
Issue Type: Feature Request
Reporter: Dan Allen
Priority: Minor
Fix For: 1.0.0.Beta2
Often times when writing an extension, you need to know if one Type is assignable from
another Type. This is a more sophisticated version of Class#isAssignableFrom(Class) which
takes into account paramaterized types.
given
parameterized type Bean<N extends Number>
then
type Bean<Number> is assignable from type Bean<Integer>
One area where this is useful is when checking if a bean type is more specific than
another bean type. It's not sufficient to assume the bean type is a simple class.
Something similar to what is provided by:
http://google-gson.googlecode.com/svn-history/r442/trunk/gson/src/main/ja...
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11:09 a.m.
New subject: [JBoss JIRA] Commented: (WELDX-188) Provide utility to check if Type is assignable to another Type
[
https://jira.jboss.org/browse/WELDX-188?page=com.atlassian.jira.plugin.sy...
]
Dan Allen commented on WELDX-188:
---------------------------------
I'm creating producer methods to satisfy injection points with narrowed types. I want
to be able to determine if the type at the injection point is more specific than a type
I've already registered. If so, I want to keep the most specific type as it will cover
both cases.
Example:
@RequestParam("width") Integer w;
@RequestParam("height") Number h;
Integer is more specific and that's the producer I need.
This case is simple, but my provider must be able to deal generically w/ parameterized
types at the injection point.
Provide utility to check if Type is assignable to another Type
--------------------------------------------------------------
Key: WELDX-188
URL: https://jira.jboss.org/browse/WELDX-188
Project: Weld Extensions
Issue Type: Feature Request
Reporter: Dan Allen
Priority: Minor
Fix For: 1.0.0.Beta2
Often times when writing an extension, you need to know if one Type is assignable from
another Type. This is a more sophisticated version of Class#isAssignableFrom(Class) which
takes into account paramaterized types.
given
parameterized type Bean<N extends Number>
then
type Bean<Number> is assignable from type Bean<Integer>
One area where this is useful is when checking if a bean type is more specific than
another bean type. It's not sufficient to assume the bean type is a simple class.
Something similar to what is provided by:
http://google-gson.googlecode.com/svn-history/r442/trunk/gson/src/main/ja...
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11:13 a.m.
New subject: [JBoss JIRA] Commented: (WELDX-188) Provide utility to check if Type is assignable to another Type
[
https://jira.jboss.org/browse/WELDX-188?page=com.atlassian.jira.plugin.sy...
]
Pete Muir commented on WELDX-188:
---------------------------------
I see, that makes sense.
Well we can certainly add this.
Provide utility to check if Type is assignable to another Type
--------------------------------------------------------------
Key: WELDX-188
URL: https://jira.jboss.org/browse/WELDX-188
Project: Weld Extensions
Issue Type: Feature Request
Reporter: Dan Allen
Priority: Minor
Fix For: 1.0.0.Beta2
Often times when writing an extension, you need to know if one Type is assignable from
another Type. This is a more sophisticated version of Class#isAssignableFrom(Class) which
takes into account paramaterized types.
given
parameterized type Bean<N extends Number>
then
type Bean<Number> is assignable from type Bean<Integer>
One area where this is useful is when checking if a bean type is more specific than
another bean type. It's not sufficient to assume the bean type is a simple class.
Something similar to what is provided by:
http://google-gson.googlecode.com/svn-history/r442/trunk/gson/src/main/ja...
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4946
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4949
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Dan Allen (JIRA) -
Pete Muir (JIRA)