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coding-Interview/NestedJsonParser.java at master · arjunmullick/coding-Interview · GitHub
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NestedJsonParser.java
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coding-Interview
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NestedJsonParser.java
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/**
* // This is the interface that allows for creating nested lists.
* // You should not implement it, or speculate about its implementation
* public interface NestedInteger {
* // Constructor initializes an empty nested list.
* public NestedInteger();
*
* // Constructor initializes a single integer.
* public NestedInteger(int value);
*
* // @return true if this NestedInteger holds a single integer, rather than a nested list.
* public boolean isInteger();
*
* // @return the single integer that this NestedInteger holds, if it holds a single integer
* // Return null if this NestedInteger holds a nested list
* public Integer getInteger();
*
* // Set this NestedInteger to hold a single integer.
* public void setInteger(int value);
*
* // Set this NestedInteger to hold a nested list and adds a nested integer to it.
* public void add(NestedInteger ni);
*
* // @return the nested list that this NestedInteger holds, if it holds a nested list
* // Return null if this NestedInteger holds a single integer
* public List<NestedInteger> getList();
* }
*/
class
Solution
{
public
NestedInteger
deserialize
(
String
s
) {
Stack
<
NestedInteger
>
stack
=
new
Stack
<>();
int
l
=
0
;
int
r
=
0
;
int
n
=
s
.
length
();
if
(
n
==
0
)
return
new
NestedInteger
();
//special case
if
(
s
.
charAt
(
0
) !=
'['
)
return
new
NestedInteger
(
Integer
.
valueOf
(
s
));
NestedInteger
curr
=
null
;
for
(
r
=
0
;
r
<
s
.
length
();
r
++) {
char
ch
=
s
.
charAt
(
r
);
if
(
ch
==
'['
) {
if
(
curr
!=
null
) {
stack
.
push
(
curr
);
}
curr
=
new
NestedInteger
();
l
=
r
+
1
;
}
else
if
(
ch
==
']'
) {
String
num
=
s
.
substring
(
l
,
r
);
if
(!
num
.
isEmpty
())
curr
.
add
(
new
NestedInteger
(
Integer
.
valueOf
(
num
)));
if
(!
stack
.
isEmpty
()) {
NestedInteger
pop
=
stack
.
pop
();
pop
.
add
(
curr
);
curr
=
pop
;
}
l
=
r
+
1
;
}
else
if
(
ch
==
','
) {
if
(
s
.
charAt
(
r
-
1
) !=
']'
) {
String
num
=
s
.
substring
(
l
,
r
);
curr
.
add
(
new
NestedInteger
(
Integer
.
valueOf
(
num
)));
}
l
=
r
+
1
;
}
}
return
curr
;
}
}
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