Could someone help me. In C#.net I need to pull the properties and their values from objects within objects. Object "pc" may have other objects of different types in it and I need to recursively move through "pc" extracting what I need.
Picture of hierarchy found here:
http://www.virtualizeplanet.com/pcobjects.jpg
I've tried pass the val property into a separate object "cc" the tried to iterate through it with this code but I don't get the right results:
object cc = pc.val;
foreach (var pp in cc.GetType().GetProperties())
{
string name = pp.Name;
}
Could you solution be along these lines?
string name = PC.Name;
int[] values;
foreach (obj value in val)
{
values.Add(value);
}
// Do stuff
Related
What I am trying to do: Fill the namesArray with all the objects that match a certain criteria.
The Activity object is made of four strings "category, name, note, time"
The getCategory(activityArray) returns a string which is the selected category, I'm trying to sort the objects where their category matches the selected category into the new namesArray
So this namesArray will end up containing only Activity objects with selected category.
This is my code:
public static void viewActivity(ArrayList<Activity> activityArray) {
String categ = getCategory(activityArray);
String holder;
ArrayList<Activity> namesArray = new ArrayList<Activity>();
for(Activity obj : activityArray) {
holder = obj.getCategory();
if(holder == categ) {
System.out.println(obj.getName());
namesArray.add(obj);
}
}
}
When I run the debugger, first iteration works, and the first object where it's category matches the selected category is added to the namesArray. But then the if statement just seems to stop working, the holder String does not change and stays the same.
So how do I get my method to add every matching object to the namesArray instead of only the first one?
Thanks
Solved by changing the
if(holder == categ) {
to
if(holder.equals(categ)) {
I am iterating over a collection of data, in my case, an array of objects. Here is a sample of 2 data points from it:
{
violation_id: '211315',
inspection_id: '268804',
violation_category: 'Garbage and Refuse',
violation_date: '2012-03-22 0:00',
violation_date_closed: '',
violation_type: 'Refuse Accumulation' },
{
violation_id: '214351',
inspection_id: '273183',
violation_category: 'Building Conditions',
violation_date: '2012-05-01 0:00',
violation_date_closed: '2012-04-17 0:00',
violation_type: 'Mold or Mildew' }
I need to create a new array of objects from this, one for each "violation_category" property. If Violation category already exists in the new array I am creating, i simply add the information to that existing category object (instead of having two "building conditions" objects for example, I would just add to an existing one).
However, I am having trouble assigning to the existing object if the current one exists (it's easy to check if it does not, but not the other way around). This is what am attempting to do currently:
if (violationCategory.uniqueCategoryName) {
violationCategory.uniqueCategoryName.violations = results[i].violation_id;
violationCategory.uniqueCategoryName.date = results[i].violation_date;
violationCategory.uniqueCategoryName.closed =
results[i].violation_date_closed;
} else {
category.violations = results[i].violation_id;
category.date = results[i].violation_date;
category.closed = results[i].violation_date_closed;
violationCategory.push(category);
}
In first condition, if this category (key) exists, I simply add to it, and in the second condition, this is where I am struggling. Any help appreciated. Thanks guys.
Just add an empty object to the key if there no object there :
violationCategory.uniqueCategoryName = violationCategory.uniqueCategoryName || {};
And only then, add the data you want to the object.
violationCategory.uniqueCategoryName.violations = results[i].violation_id;
violationCategory.uniqueCategoryName.date = results[i].violation_date;
violationCategory.uniqueCategoryName.closed =
results[i].violation_date_closed;
No condition needed.
Good luck!
Assuming that you have an input variable which is an array of objects, where the objects are looking like the objects of the question, you can generate your output like this:
var output = {};
for (var item of input) {
if (!output[item.violation_category]) output[item.violation_category] = [];
output[item.violation_category].push(item);
}
Of course you might customize it like you want.
I have a map1 which holds the information as
[40256942,6] [60246792,5]
Now that I want to prepare a map2 that holds information such as
itemNo, 40256942
qty, 6
itemNo, 60246792
qty, 5
to prepare final information as json
“partialArticlesInfo”: [{itemNo:”40256942”, availQty:”6”}, {itemNo:”60246792”, availQty:”5”}]
I am trying to iterate map1 to retrieve values and set that against the key. But I am getting only one entry which is last one. Is there any way , I get the new map with entries such as mentioned above
Map<String, String> partialArticlesInfo = new HashMap<String,String>();
Map<String, String> partialArticlesTempMap = null;
for (Map.Entry<String,String> entry : partialStockArticlesQtyMap.entrySet())
{
partialArticlesTempMap = new HashMap<String,String>();
partialArticlesTempMap.put("itemNo",entry.getKey());
partialArticlesTempMap.put("availQty",entry.getValue());
partialArticlesInfo.putAll(partialArticlesTempMap);
}
In Java (I'm assuming you're using Java, in the future it would be helpful to specify that) and every other language I know of, a map holds mappings between keys and values. Only one mapping is allowed per key. In your "map2", the keys are "itemNo" and "availQty". So what is happening is that your for loop sets the values for the first entry, and then is overwriting them with the data from the second entry, which is why that is the only one you see. Look at Java - Map and Map - Java 8 for more info.
I don't understand why you are trying to put the data into a map, you could just put it straight into JSON with something like this:
JSONArray partialArticlesInfo = new JSONArray();
for (Map.Entry<String,String> entry : partialStockArticlesQtyMap.entrySet()) {
JSONObject stockEntry = new JSONObject();
stockEntry.put("itemNo", entry.getKey());
stockEntry.put("availQty", entry.getValue());
partialArticlesInfo.put(stockEntry);
}
JSONObject root = new JSONObject();
root.put("partialArticlesInfo",partialArticlesInfo);
This will take "map1" (partialStockArticlesQtyMap in your code) and create a JSON object exactly like your example - no need to have map2 as an intermediate step. It loops over each entry in map1, creates a JSON object representing it and adds it to a JSON array, which is finally added to a root JSON object as "partialArticlesInfo".
The exact code may be slightly different depending on which JSON library you are using - check the docs for the specifics.
I agree with Brendan. Another solution would be otherwise to store in the Set or List objects like the following.
class Item {
Long itemNo;
int quantity;
public int hashCode() {
Long.hashCode(itemNo) + Integer.hashCode(quantity);
}
public int equals(Object other) {
other instanceOf Item && other.itemNo == this.itemNo && other.quantity = this.quantity;
}
}
}
then you can use the JsonArray method described by him to get the Json string in output
This means that adding new variables to the object won't require any more effort to generate the Json
I am trying to add all elements of an object into ArrayList. elements of the object are of different type.
e.g. object Employee having attributes like emp_id,name,address,DOB.
I want to store each attribute as an object in an ArrayList. Like,
ArrayList[1] = Employee.emp_id
ArrayList[2] = Employee.name
ArrayList[3] = Employee.address
I want to do it dynamically. Like, in future more attributes are added in this object, without doing a manual work. Is there a way to create an array List?
ArrayList must be of the same type. You can have an ArrayList of type in which you can do what you are doing, since all objects in Java extend Object. If you are trying to store different Object types in an arraylist, however, this is not possible.
You may know that first part, just was a little unclear in your post.
Here's how to do it with objects using reflection:
//make sure you import java.lang.reflect.*
public void addMyFields(Employee e){
ArrayList<Object> list = new ArrayList();
for (Field field : emp.getClass().getDeclaredFields())
{
field.setAccessible(true);
list.add(field.get(emp);
}
}
I have used dynamic object but here is a situation where the column names comes from a pre-defined string arrays.How can i create objects at runtime with these pre-defined set of column values?.
The reason why i wanted to do this way is to create a custom class and add custom validation attributes in it so that i can use reflection at runtime to populate values to these dynamic objects mapped to my custom class and validate the values using a single function.
dynamic x = new MyCustomClass();
x.Name = "Jones"; // The Field or Column name "Name" comes from a array of strings.
Validator.Validate(x); //Here i use reflection to iterate through the custom attributes on MyCustomClass and validate them based on conditions.
Is it possible to do something like this x."Name" = "Jones"; :-)
I would suggest perhaps adding an indexer property to your MyCustomClass?
public string this[string binder] {
get {
string result;
return (this.TryGetMember(binder, out result)) ? result : string.Empty
}
set {
this.TrySetMember(binder, value);
}
}
x["Name"] = "Jones";