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+// Copyright 2016 Yahoo Inc. 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 + '\'';
+ }
+ }
+}