Mixing
Parse multi-dimensional JSON array to flat int list in Java
0
I'm building a small micro service to implement a couple of sorting algorithms using Java & Vert.x
One of my requirements is to handle nested lists like [5, [4, 3, 2], 1, [[0]]]
The request body is a JSON object like:
{"arr": [5, [4, 3, 2], 1, [[0]]]}
How can I parse a JSON object/ JSON array with a nested list to a flat list in Java?
// This is how I handle simple lists
private void doBubbleSort(RoutingContext routingContext) {
JsonObject json = routingContext.getBodyAsJson();
JsonArray jsonArray = json.getJsonArray("arr");
// How do I get the size of the list if it is multi-dimensional
int size = jsonArray.size();
int unsortedList = new int[size];
for (int i = 0; i < size; i++) {
// Here I want to check whether the current item is an int or
// another nested list. if it is a list, i want to loop over it
// and also add it to the result
unsortedList[i] = jsonArray.getInteger(i);
}
...
}
The result I'm looking for:
int[5, 4, 3, 2, 1, 0]
I know I need to check whether the current value is of type int or list, but struggling to get it working with the type conversions from JSON to int to list.
In Python I can do this without the type conversions.
def flatten_list(arr: list):
nested_arr = deepcopy(arr)
while nested_arr:
sublist = nested_arr.pop(0)
if isinstance(sublist, int):
yield sublist
if isinstance(sublist, list):
nested_arr = sublist + nested_arr
java json nested vert.x flatten
asked Jan 2 at 15:13
krankitkrankit
2217
add a comment |
0
I'm building a small micro service to implement a couple of sorting algorithms using Java & Vert.x
One of my requirements is to handle nested lists like [5, [4, 3, 2], 1, [[0]]]
The request body is a JSON object like:
{"arr": [5, [4, 3, 2], 1, [[0]]]}
How can I parse a JSON object/ JSON array with a nested list to a flat list in Java?
// This is how I handle simple lists
private void doBubbleSort(RoutingContext routingContext) {
JsonObject json = routingContext.getBodyAsJson();
JsonArray jsonArray = json.getJsonArray("arr");
// How do I get the size of the list if it is multi-dimensional
int size = jsonArray.size();
int unsortedList = new int[size];
for (int i = 0; i < size; i++) {
// Here I want to check whether the current item is an int or
// another nested list. if it is a list, i want to loop over it
// and also add it to the result
unsortedList[i] = jsonArray.getInteger(i);
}
...
}
The result I'm looking for:
int[5, 4, 3, 2, 1, 0]
I know I need to check whether the current value is of type int or list, but struggling to get it working with the type conversions from JSON to int to list.
In Python I can do this without the type conversions.
def flatten_list(arr: list):
nested_arr = deepcopy(arr)
while nested_arr:
sublist = nested_arr.pop(0)
if isinstance(sublist, int):
yield sublist
if isinstance(sublist, list):
nested_arr = sublist + nested_arr
java json nested vert.x flatten
asked Jan 2 at 15:13
krankitkrankit
2217
Are you using Java8+ or Java7- ? The second question is how deep the nest can be?
– aBnormaLz
Jan 2 at 15:35
@aBnormaLz I'm using Java8. thanks
– krankit
Jan 2 at 16:28
Okay, and how deep the nest can be? only 3 levels? More?
– aBnormaLz
Jan 2 at 16:32
@aBnormaLz More than 3. I'm expecting lists of different complexity. Some may be simple [3, 2, 1] and some could have nested elements like [1, [[[[3]]]], 2] or [[1], 2, 3]. But the complexity is not known in advance
– krankit
Jan 2 at 16:54
add a comment |
0
0
0
I'm building a small micro service to implement a couple of sorting algorithms using Java & Vert.x
One of my requirements is to handle nested lists like [5, [4, 3, 2], 1, [[0]]]
The request body is a JSON object like:
{"arr": [5, [4, 3, 2], 1, [[0]]]}
How can I parse a JSON object/ JSON array with a nested list to a flat list in Java?
// This is how I handle simple lists
private void doBubbleSort(RoutingContext routingContext) {
JsonObject json = routingContext.getBodyAsJson();
JsonArray jsonArray = json.getJsonArray("arr");
// How do I get the size of the list if it is multi-dimensional
int size = jsonArray.size();
int unsortedList = new int[size];
for (int i = 0; i < size; i++) {
// Here I want to check whether the current item is an int or
// another nested list. if it is a list, i want to loop over it
// and also add it to the result
unsortedList[i] = jsonArray.getInteger(i);
}
...
}
The result I'm looking for:
int[5, 4, 3, 2, 1, 0]
I know I need to check whether the current value is of type int or list, but struggling to get it working with the type conversions from JSON to int to list.
In Python I can do this without the type conversions.
def flatten_list(arr: list):
nested_arr = deepcopy(arr)
while nested_arr:
sublist = nested_arr.pop(0)
if isinstance(sublist, int):
yield sublist
if isinstance(sublist, list):
nested_arr = sublist + nested_arr
java json nested vert.x flatten
asked Jan 2 at 15:13
krankitkrankit
2217
I'm building a small micro service to implement a couple of sorting algorithms using Java & Vert.x
One of my requirements is to handle nested lists like [5, [4, 3, 2], 1, [[0]]]
The request body is a JSON object like:
{"arr": [5, [4, 3, 2], 1, [[0]]]}
How can I parse a JSON object/ JSON array with a nested list to a flat list in Java?
// This is how I handle simple lists
private void doBubbleSort(RoutingContext routingContext) {
JsonObject json = routingContext.getBodyAsJson();
JsonArray jsonArray = json.getJsonArray("arr");
// How do I get the size of the list if it is multi-dimensional
int size = jsonArray.size();
int unsortedList = new int[size];
for (int i = 0; i < size; i++) {
// Here I want to check whether the current item is an int or
// another nested list. if it is a list, i want to loop over it
// and also add it to the result
unsortedList[i] = jsonArray.getInteger(i);
}
...
}
The result I'm looking for:
int[5, 4, 3, 2, 1, 0]
I know I need to check whether the current value is of type int or list, but struggling to get it working with the type conversions from JSON to int to list.
In Python I can do this without the type conversions.
def flatten_list(arr: list):
nested_arr = deepcopy(arr)
while nested_arr:
sublist = nested_arr.pop(0)
if isinstance(sublist, int):
yield sublist
if isinstance(sublist, list):
nested_arr = sublist + nested_arr
java json nested vert.x flatten
java json nested vert.x flatten
asked Jan 2 at 15:13
krankitkrankit
2217
asked Jan 2 at 15:13
krankitkrankit
2217
asked Jan 2 at 15:13
krankitkrankit
2217
asked Jan 2 at 15:13
krankitkrankit
2217
asked Jan 2 at 15:13
krankitkrankit
2217
2217
Are you using Java8+ or Java7- ? The second question is how deep the nest can be?
– aBnormaLz
Jan 2 at 15:35
@aBnormaLz I'm using Java8. thanks
– krankit
Jan 2 at 16:28
Okay, and how deep the nest can be? only 3 levels? More?
– aBnormaLz
Jan 2 at 16:32
@aBnormaLz More than 3. I'm expecting lists of different complexity. Some may be simple [3, 2, 1] and some could have nested elements like [1, [[[[3]]]], 2] or [[1], 2, 3]. But the complexity is not known in advance
– krankit
Jan 2 at 16:54
add a comment |
Are you using Java8+ or Java7- ? The second question is how deep the nest can be?
– aBnormaLz
Jan 2 at 15:35
@aBnormaLz I'm using Java8. thanks
– krankit
Jan 2 at 16:28
Okay, and how deep the nest can be? only 3 levels? More?
– aBnormaLz
Jan 2 at 16:32
@aBnormaLz More than 3. I'm expecting lists of different complexity. Some may be simple [3, 2, 1] and some could have nested elements like [1, [[[[3]]]], 2] or [[1], 2, 3]. But the complexity is not known in advance
– krankit
Jan 2 at 16:54
Are you using Java8+ or Java7- ? The second question is how deep the nest can be?
– aBnormaLz
Jan 2 at 15:35
Are you using Java8+ or Java7- ? The second question is how deep the nest can be?
– aBnormaLz
Jan 2 at 15:35
@aBnormaLz I'm using Java8. thanks
– krankit
Jan 2 at 16:28
@aBnormaLz I'm using Java8. thanks
– krankit
Jan 2 at 16:28
Okay, and how deep the nest can be? only 3 levels? More?
– aBnormaLz
Jan 2 at 16:32
Okay, and how deep the nest can be? only 3 levels? More?
– aBnormaLz
Jan 2 at 16:32
@aBnormaLz More than 3. I'm expecting lists of different complexity. Some may be simple [3, 2, 1] and some could have nested elements like [1, [[[[3]]]], 2] or [[1], 2, 3]. But the complexity is not known in advance
– krankit
Jan 2 at 16:54
@aBnormaLz More than 3. I'm expecting lists of different complexity. Some may be simple [3, 2, 1] and some could have nested elements like [1, [[[[3]]]], 2] or [[1], 2, 3]. But the complexity is not known in advance
– krankit
Jan 2 at 16:54
add a comment |
1 Answer
1
active
oldest
votes
1
According to your answers try the following:
private void doBubbleSort(RoutingContext routingContext) {
JsonObject json = routingContext.getBodyAsJson();
JsonArray jsonArray = json.getJsonArray("arr");
List<?> list = jsonArray.getList();
List<Integer> flatList = list.stream()
.map(this::getOrFlatten)
.flatMap(List::stream)
.collect(Collectors.toList());
// convert List<Integer> to int
// ...
}
private List<Integer> getOrFlatten(Object o) {
if(o instanceof Integer) {
return Collections.singletonList((Integer) o);
} else if(o instanceof List) {
List<?> list = (List) o;
return list.stream()
.map(this::getOrFlatten)
.flatMap(List::stream)
.collect(Collectors.toList());
} else {
throw new IllegalArgumentException(o.getClass() + " is not supported at getOrFlatten");
}
}
Here you can find how to convert List to int
answered Jan 2 at 17:19
aBnormaLzaBnormaLz
595416
Thanks! Had no idea how to handle the 'unknown' values. TheList<?> list = jsonArray.getList();was exactly what I needed. Will need to dig deeper into java generics
– krankit
Jan 2 at 20:30
Your welcome :) also you can take a look atlist.parallelStream(), if you want to run the multiplegetOrFlattencalls concurrently.
– aBnormaLz
Jan 3 at 9:46
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
1
According to your answers try the following:
private void doBubbleSort(RoutingContext routingContext) {
JsonObject json = routingContext.getBodyAsJson();
JsonArray jsonArray = json.getJsonArray("arr");
List<?> list = jsonArray.getList();
List<Integer> flatList = list.stream()
.map(this::getOrFlatten)
.flatMap(List::stream)
.collect(Collectors.toList());
// convert List<Integer> to int
// ...
}
private List<Integer> getOrFlatten(Object o) {
if(o instanceof Integer) {
return Collections.singletonList((Integer) o);
} else if(o instanceof List) {
List<?> list = (List) o;
return list.stream()
.map(this::getOrFlatten)
.flatMap(List::stream)
.collect(Collectors.toList());
} else {
throw new IllegalArgumentException(o.getClass() + " is not supported at getOrFlatten");
}
}
Here you can find how to convert List to int
answered Jan 2 at 17:19
aBnormaLzaBnormaLz
595416
Thanks! Had no idea how to handle the 'unknown' values. TheList<?> list = jsonArray.getList();was exactly what I needed. Will need to dig deeper into java generics
– krankit
Jan 2 at 20:30
Your welcome :) also you can take a look atlist.parallelStream(), if you want to run the multiplegetOrFlattencalls concurrently.
– aBnormaLz
Jan 3 at 9:46
add a comment |
1
According to your answers try the following:
private void doBubbleSort(RoutingContext routingContext) {
JsonObject json = routingContext.getBodyAsJson();
JsonArray jsonArray = json.getJsonArray("arr");
List<?> list = jsonArray.getList();
List<Integer> flatList = list.stream()
.map(this::getOrFlatten)
.flatMap(List::stream)
.collect(Collectors.toList());
// convert List<Integer> to int
// ...
}
private List<Integer> getOrFlatten(Object o) {
if(o instanceof Integer) {
return Collections.singletonList((Integer) o);
} else if(o instanceof List) {
List<?> list = (List) o;
return list.stream()
.map(this::getOrFlatten)
.flatMap(List::stream)
.collect(Collectors.toList());
} else {
throw new IllegalArgumentException(o.getClass() + " is not supported at getOrFlatten");
}
}
Here you can find how to convert List to int
answered Jan 2 at 17:19
aBnormaLzaBnormaLz
595416
Thanks! Had no idea how to handle the 'unknown' values. TheList<?> list = jsonArray.getList();was exactly what I needed. Will need to dig deeper into java generics
– krankit
Jan 2 at 20:30
Your welcome :) also you can take a look atlist.parallelStream(), if you want to run the multiplegetOrFlattencalls concurrently.
– aBnormaLz
Jan 3 at 9:46
add a comment |
1
1
1
According to your answers try the following:
private void doBubbleSort(RoutingContext routingContext) {
JsonObject json = routingContext.getBodyAsJson();
JsonArray jsonArray = json.getJsonArray("arr");
List<?> list = jsonArray.getList();
List<Integer> flatList = list.stream()
.map(this::getOrFlatten)
.flatMap(List::stream)
.collect(Collectors.toList());
// convert List<Integer> to int
// ...
}
private List<Integer> getOrFlatten(Object o) {
if(o instanceof Integer) {
return Collections.singletonList((Integer) o);
} else if(o instanceof List) {
List<?> list = (List) o;
return list.stream()
.map(this::getOrFlatten)
.flatMap(List::stream)
.collect(Collectors.toList());
} else {
throw new IllegalArgumentException(o.getClass() + " is not supported at getOrFlatten");
}
}
Here you can find how to convert List to int
answered Jan 2 at 17:19
aBnormaLzaBnormaLz
595416
According to your answers try the following:
private void doBubbleSort(RoutingContext routingContext) {
JsonObject json = routingContext.getBodyAsJson();
JsonArray jsonArray = json.getJsonArray("arr");
List<?> list = jsonArray.getList();
List<Integer> flatList = list.stream()
.map(this::getOrFlatten)
.flatMap(List::stream)
.collect(Collectors.toList());
// convert List<Integer> to int
// ...
}
private List<Integer> getOrFlatten(Object o) {
if(o instanceof Integer) {
return Collections.singletonList((Integer) o);
} else if(o instanceof List) {
List<?> list = (List) o;
return list.stream()
.map(this::getOrFlatten)
.flatMap(List::stream)
.collect(Collectors.toList());
} else {
throw new IllegalArgumentException(o.getClass() + " is not supported at getOrFlatten");
}
}
Here you can find how to convert List to int
answered Jan 2 at 17:19
aBnormaLzaBnormaLz
595416
answered Jan 2 at 17:19
aBnormaLzaBnormaLz
595416
answered Jan 2 at 17:19
aBnormaLzaBnormaLz
595416
answered Jan 2 at 17:19
aBnormaLzaBnormaLz
595416
595416
Thanks! Had no idea how to handle the 'unknown' values. TheList<?> list = jsonArray.getList();was exactly what I needed. Will need to dig deeper into java generics
– krankit
Jan 2 at 20:30
Your welcome :) also you can take a look atlist.parallelStream(), if you want to run the multiplegetOrFlattencalls concurrently.
– aBnormaLz
Jan 3 at 9:46
add a comment |
Thanks! Had no idea how to handle the 'unknown' values. TheList<?> list = jsonArray.getList();was exactly what I needed. Will need to dig deeper into java generics
– krankit
Jan 2 at 20:30
Your welcome :) also you can take a look atlist.parallelStream(), if you want to run the multiplegetOrFlattencalls concurrently.
– aBnormaLz
Jan 3 at 9:46
Thanks! Had no idea how to handle the 'unknown' values. The
List<?> list = jsonArray.getList(); was exactly what I needed. Will need to dig deeper into java generics– krankit
Jan 2 at 20:30
Thanks! Had no idea how to handle the 'unknown' values. The
List<?> list = jsonArray.getList(); was exactly what I needed. Will need to dig deeper into java generics– krankit
Jan 2 at 20:30
Your welcome :) also you can take a look at
list.parallelStream(), if you want to run the multiple getOrFlatten calls concurrently.– aBnormaLz
Jan 3 at 9:46
Your welcome :) also you can take a look at
list.parallelStream(), if you want to run the multiple getOrFlatten calls concurrently.– aBnormaLz
Jan 3 at 9:46
add a comment |
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Are you using Java8+ or Java7- ? The second question is how deep the nest can be?
– aBnormaLz
Jan 2 at 15:35
@aBnormaLz I'm using Java8. thanks
– krankit
Jan 2 at 16:28
Okay, and how deep the nest can be? only 3 levels? More?
– aBnormaLz
Jan 2 at 16:32
@aBnormaLz More than 3. I'm expecting lists of different complexity. Some may be simple [3, 2, 1] and some could have nested elements like [1, [[[[3]]]], 2] or [[1], 2, 3]. But the complexity is not known in advance
– krankit
Jan 2 at 16:54