“Creator” pattern to configure inherited objects
I have the following object structure:
class Annotation;
class LabelAnnotation: inherits Annotation;
class TextAnnotation: inherits LabelAnnotation;
I would like to use "creator" objects to do some initialization on these object (This initialization depends on external settings so I don't want to do it in the constructor of these objects.)
In particular, when creating a LabelAnnotation I would like to do:
fontSize = AppDefaults.fontSize
So I'm writing a "creator":
class LabelAnnotationCreator {
LabelAnnotation create() {
annotation = LabelAnnotation()
annotation.fontSize = AppDefaults.fontSize
return annotation;
}
}
Now, I would like to create a TextAnnotationCreator. This is where I'm stuck: I can't use the LabelAnnotationCreator because it would create an instance of a LabelAnnotation, but on the other hand, I want to benefit from the initialization performed by the LabelAnnotationCreator.
class TextAnnotationCreator {
TextAnnotation create() {
annotation = TextAnnotation()
// I'm stuck here:
// can't do LabelAnnotationCreator().create()… ???
return annotation;
}
}
Obviously, this isn't the right pattern but I'm not sure how to find the correct one.
Thanks!
java design-patterns prototype factory builder
asked Nov 21 '18 at 11:35
KamchatkaKamchatka
2,25623062
add a comment |
I have the following object structure:
class Annotation;
class LabelAnnotation: inherits Annotation;
class TextAnnotation: inherits LabelAnnotation;
I would like to use "creator" objects to do some initialization on these object (This initialization depends on external settings so I don't want to do it in the constructor of these objects.)
In particular, when creating a LabelAnnotation I would like to do:
fontSize = AppDefaults.fontSize
So I'm writing a "creator":
class LabelAnnotationCreator {
LabelAnnotation create() {
annotation = LabelAnnotation()
annotation.fontSize = AppDefaults.fontSize
return annotation;
}
}
Now, I would like to create a TextAnnotationCreator. This is where I'm stuck: I can't use the LabelAnnotationCreator because it would create an instance of a LabelAnnotation, but on the other hand, I want to benefit from the initialization performed by the LabelAnnotationCreator.
class TextAnnotationCreator {
TextAnnotation create() {
annotation = TextAnnotation()
// I'm stuck here:
// can't do LabelAnnotationCreator().create()… ???
return annotation;
}
}
Obviously, this isn't the right pattern but I'm not sure how to find the correct one.
Thanks!
java design-patterns prototype factory builder
asked Nov 21 '18 at 11:35
KamchatkaKamchatka
2,25623062
What do you want to benefit from the initialization of LabelAnnotationCreator object?
– Maxim Fedorov
Nov 21 '18 at 11:41
annotation.fontSize = AppDefaults.fontSize
– Kamchatka
Nov 21 '18 at 11:42
do both of TextAnnotationCreator class and LavelAnnotationCreator have fontSize property?
– Maxim Fedorov
Nov 21 '18 at 11:45
The fontSize property is not in the creator class, it's on the LabelAnnotation class. The TextAnnotation class has it as well because it inherits the LabelAnnotation class.
– Kamchatka
Nov 21 '18 at 12:25
add a comment |
I have the following object structure:
class Annotation;
class LabelAnnotation: inherits Annotation;
class TextAnnotation: inherits LabelAnnotation;
I would like to use "creator" objects to do some initialization on these object (This initialization depends on external settings so I don't want to do it in the constructor of these objects.)
In particular, when creating a LabelAnnotation I would like to do:
fontSize = AppDefaults.fontSize
So I'm writing a "creator":
class LabelAnnotationCreator {
LabelAnnotation create() {
annotation = LabelAnnotation()
annotation.fontSize = AppDefaults.fontSize
return annotation;
}
}
Now, I would like to create a TextAnnotationCreator. This is where I'm stuck: I can't use the LabelAnnotationCreator because it would create an instance of a LabelAnnotation, but on the other hand, I want to benefit from the initialization performed by the LabelAnnotationCreator.
class TextAnnotationCreator {
TextAnnotation create() {
annotation = TextAnnotation()
// I'm stuck here:
// can't do LabelAnnotationCreator().create()… ???
return annotation;
}
}
Obviously, this isn't the right pattern but I'm not sure how to find the correct one.
Thanks!
java design-patterns prototype factory builder
asked Nov 21 '18 at 11:35
KamchatkaKamchatka
2,25623062
I have the following object structure:
class Annotation;
class LabelAnnotation: inherits Annotation;
class TextAnnotation: inherits LabelAnnotation;
I would like to use "creator" objects to do some initialization on these object (This initialization depends on external settings so I don't want to do it in the constructor of these objects.)
In particular, when creating a LabelAnnotation I would like to do:
fontSize = AppDefaults.fontSize
So I'm writing a "creator":
class LabelAnnotationCreator {
LabelAnnotation create() {
annotation = LabelAnnotation()
annotation.fontSize = AppDefaults.fontSize
return annotation;
}
}
Now, I would like to create a TextAnnotationCreator. This is where I'm stuck: I can't use the LabelAnnotationCreator because it would create an instance of a LabelAnnotation, but on the other hand, I want to benefit from the initialization performed by the LabelAnnotationCreator.
class TextAnnotationCreator {
TextAnnotation create() {
annotation = TextAnnotation()
// I'm stuck here:
// can't do LabelAnnotationCreator().create()… ???
return annotation;
}
}
Obviously, this isn't the right pattern but I'm not sure how to find the correct one.
Thanks!
java design-patterns prototype factory builder
java design-patterns prototype factory builder
asked Nov 21 '18 at 11:35
KamchatkaKamchatka
2,25623062
asked Nov 21 '18 at 11:35
KamchatkaKamchatka
2,25623062
asked Nov 21 '18 at 11:35
KamchatkaKamchatka
2,25623062
asked Nov 21 '18 at 11:35
KamchatkaKamchatka
2,25623062
asked Nov 21 '18 at 11:35
KamchatkaKamchatka
2,25623062
2,25623062
What do you want to benefit from the initialization of LabelAnnotationCreator object?
– Maxim Fedorov
Nov 21 '18 at 11:41
annotation.fontSize = AppDefaults.fontSize
– Kamchatka
Nov 21 '18 at 11:42
do both of TextAnnotationCreator class and LavelAnnotationCreator have fontSize property?
– Maxim Fedorov
Nov 21 '18 at 11:45
The fontSize property is not in the creator class, it's on the LabelAnnotation class. The TextAnnotation class has it as well because it inherits the LabelAnnotation class.
– Kamchatka
Nov 21 '18 at 12:25
add a comment |
What do you want to benefit from the initialization of LabelAnnotationCreator object?
– Maxim Fedorov
Nov 21 '18 at 11:41
annotation.fontSize = AppDefaults.fontSize
– Kamchatka
Nov 21 '18 at 11:42
do both of TextAnnotationCreator class and LavelAnnotationCreator have fontSize property?
– Maxim Fedorov
Nov 21 '18 at 11:45
The fontSize property is not in the creator class, it's on the LabelAnnotation class. The TextAnnotation class has it as well because it inherits the LabelAnnotation class.
– Kamchatka
Nov 21 '18 at 12:25
What do you want to benefit from the initialization of LabelAnnotationCreator object?
– Maxim Fedorov
Nov 21 '18 at 11:41
What do you want to benefit from the initialization of LabelAnnotationCreator object?
– Maxim Fedorov
Nov 21 '18 at 11:41
annotation.fontSize = AppDefaults.fontSize
– Kamchatka
Nov 21 '18 at 11:42
annotation.fontSize = AppDefaults.fontSize
– Kamchatka
Nov 21 '18 at 11:42
do both of TextAnnotationCreator class and LavelAnnotationCreator have fontSize property?
– Maxim Fedorov
Nov 21 '18 at 11:45
do both of TextAnnotationCreator class and LavelAnnotationCreator have fontSize property?
– Maxim Fedorov
Nov 21 '18 at 11:45
The fontSize property is not in the creator class, it's on the LabelAnnotation class. The TextAnnotation class has it as well because it inherits the LabelAnnotation class.
– Kamchatka
Nov 21 '18 at 12:25
The fontSize property is not in the creator class, it's on the LabelAnnotation class. The TextAnnotation class has it as well because it inherits the LabelAnnotation class.
– Kamchatka
Nov 21 '18 at 12:25
add a comment |
1 Answer
1
active
oldest
votes
what do you think about this:
class TextAnnotation {
private final int someOtherArgs;
private final int fontSize;
public TextAnnotation(LabelAnnotation labelAnnotation, int someOtherArgs) {
this(someOtherArgs, labelAnnotation.getFontSize());
}
public TextAnnotation(int someOtherArgs, int fontSize) {
this.someOtherArgs= someOtherArgs;
this.fontSize = fontSize;
}
}
create a constructor on TextAnnotation that builds a object from a LabelAnnotation configuration. Then you can use it like this:
TextAnnotation text = new TextAnnotation(someArgs,fontSize);
or using your creator
class TextAnnotationCreator {
TextAnnotation create() {
return
new TextAnnotation(
new LabelAnnotationCreator().create(),
someOtherArgs
);
}
}
answered Nov 21 '18 at 13:47
elbraulioelbraulio
742214
These decorators are really elegant but unfortunately, I do need the LabelAnnotation and TextAnnotation as concrete types.
– Kamchatka
Nov 22 '18 at 13:53
I changed my answer. Now i suggest to use a constructor that builds an object from other object configuration
– elbraulio
Nov 22 '18 at 14:13
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
what do you think about this:
class TextAnnotation {
private final int someOtherArgs;
private final int fontSize;
public TextAnnotation(LabelAnnotation labelAnnotation, int someOtherArgs) {
this(someOtherArgs, labelAnnotation.getFontSize());
}
public TextAnnotation(int someOtherArgs, int fontSize) {
this.someOtherArgs= someOtherArgs;
this.fontSize = fontSize;
}
}
create a constructor on TextAnnotation that builds a object from a LabelAnnotation configuration. Then you can use it like this:
TextAnnotation text = new TextAnnotation(someArgs,fontSize);
or using your creator
class TextAnnotationCreator {
TextAnnotation create() {
return
new TextAnnotation(
new LabelAnnotationCreator().create(),
someOtherArgs
);
}
}
answered Nov 21 '18 at 13:47
elbraulioelbraulio
742214
These decorators are really elegant but unfortunately, I do need the LabelAnnotation and TextAnnotation as concrete types.
– Kamchatka
Nov 22 '18 at 13:53
I changed my answer. Now i suggest to use a constructor that builds an object from other object configuration
– elbraulio
Nov 22 '18 at 14:13
add a comment |
what do you think about this:
class TextAnnotation {
private final int someOtherArgs;
private final int fontSize;
public TextAnnotation(LabelAnnotation labelAnnotation, int someOtherArgs) {
this(someOtherArgs, labelAnnotation.getFontSize());
}
public TextAnnotation(int someOtherArgs, int fontSize) {
this.someOtherArgs= someOtherArgs;
this.fontSize = fontSize;
}
}
create a constructor on TextAnnotation that builds a object from a LabelAnnotation configuration. Then you can use it like this:
TextAnnotation text = new TextAnnotation(someArgs,fontSize);
or using your creator
class TextAnnotationCreator {
TextAnnotation create() {
return
new TextAnnotation(
new LabelAnnotationCreator().create(),
someOtherArgs
);
}
}
answered Nov 21 '18 at 13:47
elbraulioelbraulio
742214
These decorators are really elegant but unfortunately, I do need the LabelAnnotation and TextAnnotation as concrete types.
– Kamchatka
Nov 22 '18 at 13:53
I changed my answer. Now i suggest to use a constructor that builds an object from other object configuration
– elbraulio
Nov 22 '18 at 14:13
add a comment |
what do you think about this:
class TextAnnotation {
private final int someOtherArgs;
private final int fontSize;
public TextAnnotation(LabelAnnotation labelAnnotation, int someOtherArgs) {
this(someOtherArgs, labelAnnotation.getFontSize());
}
public TextAnnotation(int someOtherArgs, int fontSize) {
this.someOtherArgs= someOtherArgs;
this.fontSize = fontSize;
}
}
create a constructor on TextAnnotation that builds a object from a LabelAnnotation configuration. Then you can use it like this:
TextAnnotation text = new TextAnnotation(someArgs,fontSize);
or using your creator
class TextAnnotationCreator {
TextAnnotation create() {
return
new TextAnnotation(
new LabelAnnotationCreator().create(),
someOtherArgs
);
}
}
answered Nov 21 '18 at 13:47
elbraulioelbraulio
742214
what do you think about this:
class TextAnnotation {
private final int someOtherArgs;
private final int fontSize;
public TextAnnotation(LabelAnnotation labelAnnotation, int someOtherArgs) {
this(someOtherArgs, labelAnnotation.getFontSize());
}
public TextAnnotation(int someOtherArgs, int fontSize) {
this.someOtherArgs= someOtherArgs;
this.fontSize = fontSize;
}
}
create a constructor on TextAnnotation that builds a object from a LabelAnnotation configuration. Then you can use it like this:
TextAnnotation text = new TextAnnotation(someArgs,fontSize);
or using your creator
class TextAnnotationCreator {
TextAnnotation create() {
return
new TextAnnotation(
new LabelAnnotationCreator().create(),
someOtherArgs
);
}
}
answered Nov 21 '18 at 13:47
elbraulioelbraulio
742214
edited Nov 22 '18 at 14:12
answered Nov 21 '18 at 13:47
elbraulioelbraulio
742214
answered Nov 21 '18 at 13:47
elbraulioelbraulio
742214
answered Nov 21 '18 at 13:47
elbraulioelbraulio
742214
742214
These decorators are really elegant but unfortunately, I do need the LabelAnnotation and TextAnnotation as concrete types.
– Kamchatka
Nov 22 '18 at 13:53
I changed my answer. Now i suggest to use a constructor that builds an object from other object configuration
– elbraulio
Nov 22 '18 at 14:13
add a comment |
These decorators are really elegant but unfortunately, I do need the LabelAnnotation and TextAnnotation as concrete types.
– Kamchatka
Nov 22 '18 at 13:53
I changed my answer. Now i suggest to use a constructor that builds an object from other object configuration
– elbraulio
Nov 22 '18 at 14:13
These decorators are really elegant but unfortunately, I do need the LabelAnnotation and TextAnnotation as concrete types.
– Kamchatka
Nov 22 '18 at 13:53
These decorators are really elegant but unfortunately, I do need the LabelAnnotation and TextAnnotation as concrete types.
– Kamchatka
Nov 22 '18 at 13:53
I changed my answer. Now i suggest to use a constructor that builds an object from other object configuration
– elbraulio
Nov 22 '18 at 14:13
I changed my answer. Now i suggest to use a constructor that builds an object from other object configuration
– elbraulio
Nov 22 '18 at 14:13
add a comment |
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What do you want to benefit from the initialization of LabelAnnotationCreator object?
– Maxim Fedorov
Nov 21 '18 at 11:41
annotation.fontSize = AppDefaults.fontSize
– Kamchatka
Nov 21 '18 at 11:42
do both of TextAnnotationCreator class and LavelAnnotationCreator have fontSize property?
– Maxim Fedorov
Nov 21 '18 at 11:45
The fontSize property is not in the creator class, it's on the LabelAnnotation class. The TextAnnotation class has it as well because it inherits the LabelAnnotation class.
– Kamchatka
Nov 21 '18 at 12:25