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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.test;
import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;
import java.lang.reflect.Method;
/**
* Some useful matchers.
*
* @author <a href="mailto:einarmr@yahoo-inc.com">Einar M R Rosenvinge</a>
*/
public final class Matchers {
/**
* A match is found if at least <em>one</em> item in the Iterable has the given method, <em>and</em> the return value
* when calling it equals the given expected value.
*
* @param expected The expected value.
* @param methodName The name of the method to call. The method must take no parameters.
* @return A Matcher to match against an Iterable.
*/
@SuppressWarnings("rawtypes")
public static org.hamcrest.Matcher<java.lang.Iterable> hasItemWithMethod(final Object expected, final String methodName) {
return hasItemWithMethod(new MethodResult(methodName, expected));
}
/**
* A match is found if at least <em>one</em> item in the Iterable has <em>all</em> given methods, <em>and</em>
* the return values when calling them equals the given expected values.
*
* @param results The pairs of method names and expected results to compare.
* @return A Matcher to match against an Iterable.
*/
@SuppressWarnings("rawtypes")
public static org.hamcrest.Matcher<java.lang.Iterable> hasItemWithMethod(final MethodResult... results) {
return new BaseMatcher<Iterable>() {
@Override
public boolean matches(Object item) {
Iterable components = (Iterable) item;
if (!components.iterator().hasNext()) {
//empty collection
return false;
}
for (Object componentInList : components) {
boolean allMethodsMatch = false;
for (MethodResult result : results) {
Object strToMatch;
try {
Method method = componentInList.getClass().getMethod(result.getMethodName());
strToMatch = method.invoke(componentInList);
} catch (Exception e) {
allMethodsMatch = false;
break;
}
if (result.getExpectedResult().equals(strToMatch)) {
allMethodsMatch = true;
} else {
allMethodsMatch = false;
break;
}
}
if (allMethodsMatch) {
return true;
}
}
return false;
}
@Override
public void describeTo(Description description) {
StringBuilder b = new StringBuilder();
for (MethodResult result : results) {
b.append(result).append(". ");
}
description.appendText(b.toString());
}
};
}
public static final class MethodResult {
private final String methodName;
private final Object expectedResult;
public MethodResult(String methodName, Object expectedResult) {
this.methodName = methodName;
this.expectedResult = expectedResult;
}
public Object getExpectedResult() {
return expectedResult;
}
public String getMethodName() {
return methodName;
}
@Override
public String toString() {
return "Method: '" + methodName + "\', expected result: '" + expectedResult + '\'';
}
}
}
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