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package com.pojosontheweb.selenium;
import java.util.*;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import org.openqa.selenium.*;
import org.openqa.selenium.support.ui.WebDriverWait;
/**
* Utility for accessing Selenium DOM safely, wait-style.
*
* Allows to create chains of conditions and execute those conditions
* inside a WebDriverWait, in a transparent fashion.
*
* Instances are immutable and can be reused safely.
*/
public final class Findr {
/** the default wait timeout */
public static final int WAIT_TIMEOUT_SECONDS = 10; // secs
/** the sys prop name for enabling logs in findr eval(s) */
public static final String SYSPROP_VERBOSE = "webtests.findr.verbose";
private static final FindrActions DEFAULT_ACTIONS = new FindrActions();
/** ref to the driver */
private final WebDriver driver;
/** the composed function */
private final Function f;
/**
* A list of strings that represent the "path" for this findr,
* used to create meaningful failure messages
*/
private final List path;
/**
* The wait timeout (in seconds)
*/
private final int waitTimeout;
/**
* The sleep interval (between polls)
*/
private final long sleepInMillis;
private final FindrActions findrActions;
public static boolean isDebugEnabled() {
return Boolean.valueOf(System.getProperty(SYSPROP_VERBOSE, "false"));
}
private static Function debugHandler = new Function() {
@Override
public Object apply(String input) {
System.out.println(input);
return null;
}
};
/**
* Pass a function that gets called-back with the logs. By default, logs
* messages to stdout.
* @param h the debug log handler function
*/
public static void setDebugHandler(Function h) {
debugHandler = h;
}
public static void logDebug(String message) {
if (isDebugEnabled()) {
debugHandler.apply(message);
}
}
/**
* Create a Findr with passed arguments
* @param driver the WebDriver
*/
public Findr(WebDriver driver) {
this(driver, WAIT_TIMEOUT_SECONDS);
}
/**
* Create a Findr with passed arguments
* @param driver the WebDriver
* @param waitTimeout the wait timeout in seconds
*/
public Findr(WebDriver driver, int waitTimeout) {
this(
driver,
waitTimeout,
500,
null,
Collections.emptyList(),
DEFAULT_ACTIONS
);
}
/**
* Return the web driver passed at construction time
* @return the web driver
*/
public WebDriver getDriver() {
return driver;
}
/**
* Return the timeout for this findr in seconds
* @return the timeout in seconds
*/
public int getTimeout() {
return waitTimeout;
}
/**
* Helper for "nested" Findrs. Allows to use a WebElement as the
* root of a new Findr.
* @param driver The WebDriver
* @param webElement the WebElement to use as root
* @return a new Findr that has the specified WebElement as its root
*/
public static Findr fromWebElement(WebDriver driver, final WebElement webElement) {
return fromWebElement(driver, webElement, WAIT_TIMEOUT_SECONDS);
}
/**
* Helper for "nested" Findrs. Allows to use a WebElement as the
* root of a new Findr.
* @param driver The WebDriver
* @param webElement the WebElement to use as root
* @param waitTimeout the wait timeout in seconds
* @return a new Findr that has the specified WebElement as its root
*/
public static Findr fromWebElement(WebDriver driver, final WebElement webElement, int waitTimeout) {
Findr f = new Findr(driver, waitTimeout);
return f.compose(new Function() {
@Override
public WebElement apply(SearchContext input) {
return webElement;
}
}, "fromWebElement(" + webElement + ")");
}
private Findr(WebDriver driver,
int waitTimeout,
long sleepInMillis,
Function f,
List path,
FindrActions actions) {
this.driver = driver;
this.waitTimeout = waitTimeout;
this.sleepInMillis = sleepInMillis;
this.f = f;
this.path = path;
this.findrActions = actions;
}
private Function withoutWebDriverException(final Function function) {
return new Function() {
@Override
public T apply(F input) {
try {
return function.apply(input);
} catch(WebDriverException e) {
// retry in case of exception
return null;
}
}
};
}
private Findr compose(final Function function, final String pathElem) {
final Function newFunction = withoutWebDriverException(function);
ArrayList newPath = new ArrayList(path);
if (pathElem!=null) {
newPath.add(pathElem);
}
Function composed;
if (f==null) {
composed = new Function() {
@Override
public WebElement apply(SearchContext input) {
WebElement res = newFunction.apply(input);
if (res==null) {
logDebug("[Findr] ! " + pathElem + " (null)");
} else {
logDebug("[Findr] > " + pathElem + " : " + res);
}
return res;
}
};
} else {
composed = new Function() {
@Override
public WebElement apply(SearchContext input) {
WebElement res1 = f.apply(input);
if (res1==null) {
logDebug("[Findr] - " + pathElem);
return null;
} else {
WebElement res2 = newFunction.apply(res1);
if (res2==null) {
logDebug("[Findr] ! " + pathElem);
} else {
logDebug("[Findr] > " + pathElem + " : " + res2);
}
return res2;
}
}
};
}
return new Findr(driver, waitTimeout, sleepInMillis, composed, newPath, findrActions);
}
/**
* Set the timeout (in seconds) and return an updated Findr
* @param timeoutInSeconds the timeout in seconds
* @return an updated Findr instance
*/
public Findr setTimeout(int timeoutInSeconds) {
return new Findr(driver, timeoutInSeconds, sleepInMillis, f, path, findrActions);
}
/**
* Set the WebDriverWait sleep interval (in ms). Use to control polling frequency.
* @param sleepInMillis the sleep interval in milliseconds
* @return an updated Findr instance
*/
public Findr setSleepInMillis(long sleepInMillis) {
return new Findr(driver, waitTimeout, sleepInMillis, f, path, findrActions);
}
public Findr setActions(FindrActions actions) {
return new Findr(driver, waitTimeout, sleepInMillis, f, path, actions);
}
/**
* Empty the condition chain. Use to create new Findrs with same settings but
* a different condition chain.
* @return a new empty Findr with other props untouched
*/
public Findr empty() {
return new Findr(driver, waitTimeout, sleepInMillis, null, path, findrActions);
}
/**
* Adds specified single-element selector to the chain, and return a new Findr.
* @param by the selector
* @return a new Findr with updated condition chain
*/
public Findr elem(final By by) {
return compose(
new Function() {
@Override
public WebElement apply(SearchContext input) {
if (input==null) {
return null;
}
try {
return input.findElement(by);
} catch(Exception e) {
return null;
}
}
},
by.toString()
);
}
/**
* Shortcut for elem(By.cssSelector(...)).
* @param selector the css selector
* @return a new Findr with updated chain
*/
public Findr $(String selector) {
return elem(By.cssSelector(selector));
}
/**
* Adds specified multiple element selector to the chain, and return a new ListFindr.
* @param by the selector
* @return a new ListFindr with updated condition chain
*/
public ListFindr elemList(By by) {
return new ListFindr(by);
}
/**
* Shortcut for elemList(By.cssSelector(selector))
* @param selector the css selector
* @return a new ListFindr with updated condition chain
*/
public ListFindr $$(String selector) {
return elemList(By.cssSelector(selector));
}
public ListFindr append(ListFindr lf) {
return new ListFindr(lf.by, lf.filters, lf.checkers);
}
public Findr append(Findr f) {
List newPath = new ArrayList(path!=null?path:new ArrayList());
String sp;
if (f.path!=null) {
newPath.addAll(f.path);
sp = f.path.stream().collect(Collectors.joining(", "));
} else {
sp = "";
}
return compose(f.f, "append[" + sp + "]");
}
private T wrapWebDriverWait(final Function callback) throws TimeoutException {
try {
return new WebDriverWait(driver, waitTimeout, sleepInMillis).until(callback);
} catch(TimeoutException e) {
// failed to find element(s), build exception message
// and re-throw exception
StringBuilder sb = new StringBuilder();
for (Iterator it = path.iterator(); it.hasNext(); ) {
sb.append(it.next());
if (it.hasNext()) {
sb.append("->");
}
}
throw new TimeoutException("Timed out trying to find path=" + sb.toString() + ", callback=" + callback, e);
}
}
/**
* Evaluates this Findr, and invokes passed callback if the whole chain succeeds. Throws
* a TimeoutException otherwise.
* @param callback the callback to invoke (called if the whole chain of conditions succeeded)
* @param the return type of the callback
* @return the result of the callback
* @throws TimeoutException if at least one condition in the chain failed
*/
public T eval(final Function callback) throws TimeoutException {
return wrapWebDriverWait(withoutWebDriverException(new Function() {
@Override
public T apply(WebDriver input) {
if (f==null) {
throw new EmptyFindrException();
}
logDebug("[Findr] eval");
WebElement e = f.apply(input);
if (e == null) {
logDebug("[Findr] => Chain STOPPED before callback");
return null;
}
T res = callback.apply(e);
if (res==null || (res instanceof Boolean && !((Boolean)res))) {
logDebug("[Findr] => " + callback + " result : " + res + ", will try again");
} else {
logDebug("[Findr] => " + callback + " result : " + res + ", OK");
}
return res;
}
}));
}
public static final Function IDENTITY_FOR_EVAL = new Function() {
@Override
public Object apply(WebElement webElement) {
return true;
}
};
/**
* Evaluates this Findr, and blocks until all conditions are satisfied. Throws
* a TimeoutException otherwise.
*/
public void eval() throws TimeoutException {
eval(IDENTITY_FOR_EVAL);
}
/**
* Evaluates this Findr, and blocks until all conditions are satisfied. Throws
* a TimeoutException otherwise.
* @param failureMessage A message to be included to the timeout exception
*/
public void eval(String failureMessage) throws TimeoutException {
try {
eval();
} catch(TimeoutException e) {
throw new TimeoutException(failureMessage, e);
}
}
/**
* Evaluates this Findr, and invokes passed callback if the whole chain succeeds. Throws
* a TimeoutException with passed failure message otherwise.
* @param callback the callback to invoke (called if the whole chain of conditions succeeded)
* @param the return type of the callback
* @param failureMessage A message to be included to the timeout exception
* @return the result of the callback
* @throws TimeoutException if at least one condition in the chain failed
*/
public T eval(final Function callback, String failureMessage) throws TimeoutException {
try {
return eval(callback);
} catch (TimeoutException e) {
throw new TimeoutException(failureMessage, e);
}
}
/**
* Adds a Predicate (condition) to the chain, and return a new Findr
* with updated chain.
* @param predicate the condition to add
* @return a Findr with updated conditions chain
*/
public Findr where(final Predicate predicate) {
return compose(new Function() {
@Override
public WebElement apply(SearchContext input) {
if (input==null) {
return null;
}
if (input instanceof WebElement) {
WebElement webElement = (WebElement)input;
if (predicate.test(webElement)) {
return webElement;
}
return null;
} else {
throw new RuntimeException("input is not a WebElement : " + input);
}
}
},
predicate.toString()
);
}
/**
* Shortcut method : evaluates chain, and sends keys to target WebElement of this
* Findr. If sendKeys throws an exception, then the whole chain is evaluated again, until
* no exception is thrown, or timeout.
* @param keys the text to send
* @throws TimeoutException if at least one condition in the chain failed
*/
public void sendKeys(CharSequence... keys) throws TimeoutException {
eval(findrActions.sendKeys(keys));
}
/**
* Shortcut method : evaluates chain, and clicks target WebElement of this
* Findr. If the click throws an exception, then the whole chain is evaluated again, until
* no exception is thrown, or timeout.
* @throws TimeoutException if at least one condition in the chain failed
*/
public void click() {
eval(findrActions.click());
}
/**
* Shortcut method : evaluates chain, and clears target WebElement of this
* Findr. If clear throws an exception, then the whole chain is evaluated again, until
* no exception is thrown, or timeout.
* @throws TimeoutException if at least one condition in the chain failed
*/
public void clear() {
eval(findrActions.clear());
}
private static final Function,Object> IDENTITY_LIST = new Function, Object>() {
@Override
public Object apply(List webElements) {
return webElements;
}
};
/**
* Findr counterpart for element lists. Instances of this class are created and
* returned by Findr.elemList(). Allows for index-based and filtering.
*/
public class ListFindr {
private final By by;
private final Predicate filters;
private final Predicate> checkers;
private ListFindr(By by) {
this(by, null, null);
}
private ListFindr(By by, Predicate filters, Predicate> checkers) {
this.by = by;
this.filters = filters;
this.checkers = checkers;
}
private Predicate wrapAndTrap(final Predicate predicate) {
return (T input) -> {
if (input==null) {
return false;
}
try {
return predicate.test(input);
} catch(WebDriverException e) {
return false;
}
};
}
private T wrapWebDriverWaitList(final Function callback) throws TimeoutException {
try {
return new WebDriverWait(driver, waitTimeout, sleepInMillis).until(callback);
} catch(TimeoutException e) {
// failed to find element(s), build exception message
// and re-throw exception
ArrayList newPath = new ArrayList(path);
newPath.add(by.toString());
StringBuilder sb = new StringBuilder();
for (Iterator it = newPath.iterator(); it.hasNext(); ) {
sb.append(it.next());
if (it.hasNext()) {
sb.append("->");
}
}
throw new TimeoutException("Timed out trying to find path=" + sb.toString() + ", callback=" + callback, e);
}
}
/**
* Adds a filtering predicate, and returns a new ListFindr with updated chain.
* @param predicate the predicate used for filtering the list of elements (applied on each element)
* @return a new ListFindr with updated chain
* @throws java.lang.IllegalArgumentException if called after whereElemCount.
*/
public ListFindr where(final Predicate predicate) {
if (checkers != null) {
throw new IllegalArgumentException("It's forbidden to call ListFindr.where() after a whereXXX() method has been called.");
}
return new ListFindr(by, composeFilters(predicate), checkers);
}
private Predicate composeFilters(final Predicate predicate) {
return new Predicate() {
@Override
public boolean test(WebElement input) {
return (filters == null || filters.test(input)) && wrapAndTrap(predicate).test(input);
}
@Override
public String toString() {
if (filters!=null) {
return filters.toString() + " + " + predicate.toString();
} else {
return predicate.toString();
}
}
};
}
private Predicate> composeCheckers(final Predicate> predicate) {
return new Predicate>() {
@Override
public boolean test(List input) {
return (checkers == null || checkers.test(input)) && wrapAndTrap(predicate).test(input);
}
@Override
public String toString() {
if (filters!=null) {
return filters.toString() + " + " + predicate.toString();
} else {
return predicate.toString();
}
}
};
}
/**
* Index-based access to the list of elements in this ListFindr. Allows
* to wait for the n-th elem.
* @param index the index of the element to wait for
* @return a new Findr with updated chain
*/
public Findr at(final int index) {
return compose(new Function(){
@Override
public WebElement apply(SearchContext input) {
List elements;
List filtered;
try {
elements = input.findElements(by);
filtered = filterElements(elements);
} catch(Exception e) {
return null;
}
if (elements==null) {
return null;
}
if (checkers != null && !checkers.test(filtered)) {
logDebug("[Findr] ! checkList KO: " + checkers);
logDebug("[Findr] => Chain STOPPED before callback");
return null;
} else {
if (isDebugEnabled() && checkers!=null) {
logDebug("[Findr] > checkList OK: " + checkers);
}
}
if (index>=filtered.size()) {
return null;
}
return filtered.get(index);
}
},
by.toString() + "[" + index + "]"
);
}
private List filterElements(List source) {
List filtered = new ArrayList();
for (WebElement element : source) {
if (filters==null || filters.test(element)) {
filtered.add(element);
}
}
if (isDebugEnabled() && filters!=null) {
int srcSize = source.size();
int filteredSize = filtered.size();
logDebug("[Findr] > [" + by + "]* filter(" + filters + ") : " + srcSize + " -> " + filteredSize);
}
return filtered;
}
/**
* Alias for count
*/
public ListFindr whereElemCount(int elemCount) {
return count(elemCount);
}
/**
* Wait for the list findr to mach passed count
* @param elemCount the expected count
* @return a new ListFindr with updated chain
*/
public ListFindr count(int elemCount) {
return new ListFindr(by, filters, composeCheckers(checkElemCount(elemCount)));
}
/**
* Wait for the list findr so that at least one of its element match the specified predicate. Check is OK if list is empty.
* @param predicate the element predicate to match
* @return a new ListFindr with updated chain
*/
public ListFindr whereAny(final Predicate predicate) {
return new ListFindr(by, filters, composeCheckers(checkAny(predicate)));
}
/**
* Wait for the list findr so that all of its element match the specified predicate. Check is OK if list is empty.
* @param predicate the element predicate to match
* @return a new ListFindr with updated chain
*/
public ListFindr whereAll(final Predicate predicate) {
return new ListFindr(by, filters, composeCheckers(checkAll(predicate)));
}
private Predicate> checkAny(final Predicate predicate) {
return new Predicate>() {
@Override
public boolean test(List elements) {
if (elements.size() == 0) {
return true;
}
for (WebElement element : elements) {
if (predicate.test(element)) {
return true;
}
}
return false;
}
@Override
public String toString() {
return "any(" + predicate + ")";
}
};
}
private Predicate> checkAll(final Predicate predicate) {
return new Predicate>() {
@Override
public boolean test(List elements) {
for (WebElement element : elements) {
if (!predicate.test(element)) {
return false;
}
}
return true;
}
@Override
public String toString() {
return "all(" + predicate + ")";
}
};
}
private Predicate> checkElemCount(final int expectedCount) {
return new Predicate>() {
@Override
public boolean test(List elements) {
return elements != null && elements.size() == expectedCount;
}
@Override
public String toString() {
return "elemCount(" + expectedCount + ")";
}
};
}
/**
* Evaluates this ListFindr and invokes passed callback if the whole chain suceeded. Throws
* a TimeoutException if the condition chain didn't match.
* @param callback the callback to call if the chain succeeds
* @param the rturn type of the callback
* @return the result of the callback
* @throws TimeoutException if at least one condition in the chain failed
*/
public T eval(final Function, T> callback) throws TimeoutException {
logDebug("[Findr] ListFindr eval");
return wrapWebDriverWaitList(withoutWebDriverException(new Function() {
@Override
public T apply(WebDriver input) {
SearchContext c = f == null ? input : f.apply(input);
if (c == null) {
return null;
}
List elements = c.findElements(by);
if (elements == null) {
return null;
}
List filtered = filterElements(elements);
if (checkers != null && !checkers.test(filtered)) {
logDebug("[Findr] ! checkList KO: " + checkers);
logDebug("[Findr] => Chain STOPPED before callback");
return null;
} else {
if (isDebugEnabled() && checkers!=null) {
logDebug("[Findr] > checkList OK: " + checkers);
}
}
T res = callback.apply(filtered);
if (res==null || (res instanceof Boolean && !((Boolean)res))) {
logDebug("[Findr] => " + callback + " result : " + res + ", will try again");
} else {
logDebug("[Findr] => " + callback + " result : " + res + ", OK");
}
return res;
}
}));
}
/**
* Evaluates this ListFindr. Throws
* a TimeoutException if the condition chain didn't match.
* @throws TimeoutException if at least one condition in the chain failed
*/
public void eval() throws TimeoutException {
eval(IDENTITY_LIST);
}
/**
* Evaluates this ListFindr. Throws
* a TimeoutException if the condition chain didn't match.
* @param failureMessage A message to include in the timeout exception
* @throws TimeoutException if at least one condition in the chain failed
*/
public void eval(String failureMessage) throws TimeoutException {
try {
eval(IDENTITY_LIST);
} catch(TimeoutException e) {
throw new TimeoutException(failureMessage, e);
}
}
/**
* Evaluates this ListFindr and invokes passed callback if the whole chain suceeded. Throws
* a TimeoutException with passed failure message if the condition chain didn't match.
* @param callback the callback to call if the chain succeeds
* @param the rturn type of the callback
* @return the result of the callback
* @throws TimeoutException if at least one condition in the chain failed
*/
public T eval(Function, T> callback, String failureMessage) throws TimeoutException {
try {
return eval(callback);
} catch(TimeoutException e) {
throw new TimeoutException(failureMessage, e);
}
}
@Override
public String toString() {
return "ListFindr{" +
"by=" + by +
", filters=" + filters +
", checkers=" + checkers +
", findr=" + Findr.this +
'}';
}
}
@Override
public String toString() {
return "Findr{" +
"driver=" + driver +
", path=" + path +
", waitTimeout=" + waitTimeout +
'}';
}
// Utility statics
// ---------------
/**
* @deprecated use Findrs.* instead
*/
@Deprecated
public static Predicate attrEquals(final String attrName, final String expectedValue) {
return Findrs.attrEquals(attrName, expectedValue);
}
/**
* @deprecated use Findrs.* instead
*/
@Deprecated
public static Predicate attrStartsWith(final String attrName, final String expectedStartsWith) {
return Findrs.attrStartsWith(attrName, expectedStartsWith);
}
/**
* @deprecated use Findrs.* instead
*/
@Deprecated
public static Predicate attrEndsWith(final String attrName, final String expectedEndsWith) {
return Findrs.attrEndsWith(attrName, expectedEndsWith);
}
/**
* @deprecated use Findrs.* instead
*/
@Deprecated
public static Predicate hasClass(final String className) {
return Findrs.hasClass(className);
}
/**
* @deprecated use Findrs.* instead
*/
@Deprecated
public static Predicate textEquals(final String expected) {
return Findrs.textEquals(expected);
}
/**
* @deprecated use Findrs.* instead
*/
@Deprecated
public static Predicate textStartsWith(final String expectedStartsWith) {
return Findrs.textStartsWith(expectedStartsWith);
}
/**
* @deprecated use Findrs.* instead
*/
@Deprecated
public static Predicate textEndsWith(final String expectedEndsWith) {
return Findrs.textEndsWith(expectedEndsWith);
}
/**
* @deprecated use Findrs.* instead
*/
@Deprecated
public static Predicate isEnabled() {
return Findrs.isEnabled();
}
/**
* @deprecated use Findrs.* instead
*/
@Deprecated
public static Predicate isDisplayed() {
return Findrs.isDisplayed();
}
/**
* @deprecated use Findrs.* instead
*/
@Deprecated
public static Predicate cssValue(final String propName, final String expectedValue) {
return Findrs.cssValue(propName, expectedValue);
}
/**
* @deprecated use Findrs.* instead
*/
@Deprecated
public static Predicate not(final Predicate in) {
return Findrs.not(in);
}
public static final class EmptyFindrException extends IllegalStateException {
public EmptyFindrException() {
super("Calling eval() on an empty Findr ! You need to " +
"specify at least one condition before evaluating.");
}
}
}
