WebdriverWait Lambda Expression
Can someone explain clearly what is that Boolean generic type for ExpectedCondition ?
new WebDriverWait(driver, 60).until((ExpectedCondition<Boolean>) wd->((JavascriptExecutor) wd).executeScript("return document.readyState").equals("complete"));
selenium selenium-webdriver
asked Nov 13 '18 at 19:28
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Can someone explain clearly what is that Boolean generic type for ExpectedCondition ?
new WebDriverWait(driver, 60).until((ExpectedCondition<Boolean>) wd->((JavascriptExecutor) wd).executeScript("return document.readyState").equals("complete"));
selenium selenium-webdriver
asked Nov 13 '18 at 19:28
vny upparavny uppara
594
add a comment |
Can someone explain clearly what is that Boolean generic type for ExpectedCondition ?
new WebDriverWait(driver, 60).until((ExpectedCondition<Boolean>) wd->((JavascriptExecutor) wd).executeScript("return document.readyState").equals("complete"));
selenium selenium-webdriver
asked Nov 13 '18 at 19:28
vny upparavny uppara
594
Can someone explain clearly what is that Boolean generic type for ExpectedCondition ?
new WebDriverWait(driver, 60).until((ExpectedCondition<Boolean>) wd->((JavascriptExecutor) wd).executeScript("return document.readyState").equals("complete"));
selenium selenium-webdriver
selenium selenium-webdriver
asked Nov 13 '18 at 19:28
vny upparavny uppara
594
asked Nov 13 '18 at 19:28
vny upparavny uppara
594
asked Nov 13 '18 at 19:28
vny upparavny uppara
594
asked Nov 13 '18 at 19:28
vny upparavny uppara
594
asked Nov 13 '18 at 19:28
vny upparavny uppara
594
594
add a comment |
add a comment |
2 Answers
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Boolean is the return type of your lamda expression.
In your example, the final line of the javascript .equals("complete") in javascript executor returns boolean value.
For e.g., below examples returns WebElement,
new WebDriverWait(driver, 60).until((ExpectedCondition<WebElement>) wd->((JavascriptExecutor) wd).executeScript("return document.getElementById(someid)"));
new WebDriverWait(driver, 60).until((ExpectedCondition<WebElement>) wd-> wd.findElement(By.id("someid")););
answered Nov 13 '18 at 20:05
NavarasuNavarasu
1,9811822
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In the code of ExpectedCondition we can see:
public interface ExpectedCondition<T> extends Function<WebDriver, T>
That could be read as "Expected condition is a function that always accepts a WebDriver as a parameter and returns value of a generic type T>
In the code of Function we can see:
/**
* @param `<T>` the type of the input to the function
* @param `<R>` the type of the result of the function
*/
public interface Function<T, R>
Your function compares two objects:
1) Object returned by executeScript("return document.readyState"). Actually js document.readyState returns a String value loading/interactive/complete. more info here
2) String "complete"
using method .equals() that returns a booleanvalue:
((JavascriptExecutor) wd).executeScript("return document.readyState").equals("complete")
So the return value of your function is a boolean and it should have been passed as a return value type but generics in java do no allow primitives so you have to use Boolean.
Generics in Java are compile-time construct - the compiler turns all generic uses into casts to the right type. Anything that is used as generics has to be convertible to Object and primitive types aren't.
answered Nov 14 '18 at 14:25
Vladimir EfimovVladimir Efimov
699312
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Boolean is the return type of your lamda expression.
In your example, the final line of the javascript .equals("complete") in javascript executor returns boolean value.
For e.g., below examples returns WebElement,
new WebDriverWait(driver, 60).until((ExpectedCondition<WebElement>) wd->((JavascriptExecutor) wd).executeScript("return document.getElementById(someid)"));
new WebDriverWait(driver, 60).until((ExpectedCondition<WebElement>) wd-> wd.findElement(By.id("someid")););
answered Nov 13 '18 at 20:05
NavarasuNavarasu
1,9811822
add a comment |
Boolean is the return type of your lamda expression.
In your example, the final line of the javascript .equals("complete") in javascript executor returns boolean value.
For e.g., below examples returns WebElement,
new WebDriverWait(driver, 60).until((ExpectedCondition<WebElement>) wd->((JavascriptExecutor) wd).executeScript("return document.getElementById(someid)"));
new WebDriverWait(driver, 60).until((ExpectedCondition<WebElement>) wd-> wd.findElement(By.id("someid")););
answered Nov 13 '18 at 20:05
NavarasuNavarasu
1,9811822
add a comment |
Boolean is the return type of your lamda expression.
In your example, the final line of the javascript .equals("complete") in javascript executor returns boolean value.
For e.g., below examples returns WebElement,
new WebDriverWait(driver, 60).until((ExpectedCondition<WebElement>) wd->((JavascriptExecutor) wd).executeScript("return document.getElementById(someid)"));
new WebDriverWait(driver, 60).until((ExpectedCondition<WebElement>) wd-> wd.findElement(By.id("someid")););
answered Nov 13 '18 at 20:05
NavarasuNavarasu
1,9811822
Boolean is the return type of your lamda expression.
In your example, the final line of the javascript .equals("complete") in javascript executor returns boolean value.
For e.g., below examples returns WebElement,
new WebDriverWait(driver, 60).until((ExpectedCondition<WebElement>) wd->((JavascriptExecutor) wd).executeScript("return document.getElementById(someid)"));
new WebDriverWait(driver, 60).until((ExpectedCondition<WebElement>) wd-> wd.findElement(By.id("someid")););
answered Nov 13 '18 at 20:05
NavarasuNavarasu
1,9811822
answered Nov 13 '18 at 20:05
NavarasuNavarasu
1,9811822
answered Nov 13 '18 at 20:05
NavarasuNavarasu
1,9811822
answered Nov 13 '18 at 20:05
NavarasuNavarasu
1,9811822
1,9811822
add a comment |
add a comment |
In the code of ExpectedCondition we can see:
public interface ExpectedCondition<T> extends Function<WebDriver, T>
That could be read as "Expected condition is a function that always accepts a WebDriver as a parameter and returns value of a generic type T>
In the code of Function we can see:
/**
* @param `<T>` the type of the input to the function
* @param `<R>` the type of the result of the function
*/
public interface Function<T, R>
Your function compares two objects:
1) Object returned by executeScript("return document.readyState"). Actually js document.readyState returns a String value loading/interactive/complete. more info here
2) String "complete"
using method .equals() that returns a booleanvalue:
((JavascriptExecutor) wd).executeScript("return document.readyState").equals("complete")
So the return value of your function is a boolean and it should have been passed as a return value type but generics in java do no allow primitives so you have to use Boolean.
Generics in Java are compile-time construct - the compiler turns all generic uses into casts to the right type. Anything that is used as generics has to be convertible to Object and primitive types aren't.
answered Nov 14 '18 at 14:25
Vladimir EfimovVladimir Efimov
699312
add a comment |
In the code of ExpectedCondition we can see:
public interface ExpectedCondition<T> extends Function<WebDriver, T>
That could be read as "Expected condition is a function that always accepts a WebDriver as a parameter and returns value of a generic type T>
In the code of Function we can see:
/**
* @param `<T>` the type of the input to the function
* @param `<R>` the type of the result of the function
*/
public interface Function<T, R>
Your function compares two objects:
1) Object returned by executeScript("return document.readyState"). Actually js document.readyState returns a String value loading/interactive/complete. more info here
2) String "complete"
using method .equals() that returns a booleanvalue:
((JavascriptExecutor) wd).executeScript("return document.readyState").equals("complete")
So the return value of your function is a boolean and it should have been passed as a return value type but generics in java do no allow primitives so you have to use Boolean.
Generics in Java are compile-time construct - the compiler turns all generic uses into casts to the right type. Anything that is used as generics has to be convertible to Object and primitive types aren't.
answered Nov 14 '18 at 14:25
Vladimir EfimovVladimir Efimov
699312
add a comment |
In the code of ExpectedCondition we can see:
public interface ExpectedCondition<T> extends Function<WebDriver, T>
That could be read as "Expected condition is a function that always accepts a WebDriver as a parameter and returns value of a generic type T>
In the code of Function we can see:
/**
* @param `<T>` the type of the input to the function
* @param `<R>` the type of the result of the function
*/
public interface Function<T, R>
Your function compares two objects:
1) Object returned by executeScript("return document.readyState"). Actually js document.readyState returns a String value loading/interactive/complete. more info here
2) String "complete"
using method .equals() that returns a booleanvalue:
((JavascriptExecutor) wd).executeScript("return document.readyState").equals("complete")
So the return value of your function is a boolean and it should have been passed as a return value type but generics in java do no allow primitives so you have to use Boolean.
Generics in Java are compile-time construct - the compiler turns all generic uses into casts to the right type. Anything that is used as generics has to be convertible to Object and primitive types aren't.
answered Nov 14 '18 at 14:25
Vladimir EfimovVladimir Efimov
699312
In the code of ExpectedCondition we can see:
public interface ExpectedCondition<T> extends Function<WebDriver, T>
That could be read as "Expected condition is a function that always accepts a WebDriver as a parameter and returns value of a generic type T>
In the code of Function we can see:
/**
* @param `<T>` the type of the input to the function
* @param `<R>` the type of the result of the function
*/
public interface Function<T, R>
Your function compares two objects:
1) Object returned by executeScript("return document.readyState"). Actually js document.readyState returns a String value loading/interactive/complete. more info here
2) String "complete"
using method .equals() that returns a booleanvalue:
((JavascriptExecutor) wd).executeScript("return document.readyState").equals("complete")
So the return value of your function is a boolean and it should have been passed as a return value type but generics in java do no allow primitives so you have to use Boolean.
Generics in Java are compile-time construct - the compiler turns all generic uses into casts to the right type. Anything that is used as generics has to be convertible to Object and primitive types aren't.
answered Nov 14 '18 at 14:25
Vladimir EfimovVladimir Efimov
699312
answered Nov 14 '18 at 14:25
Vladimir EfimovVladimir Efimov
699312
answered Nov 14 '18 at 14:25
Vladimir EfimovVladimir Efimov
699312
answered Nov 14 '18 at 14:25
Vladimir EfimovVladimir Efimov
699312
699312
add a comment |
add a comment |
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