Match upstream file structure

Bug: 30946317
Test: make checkbuild and run cts CtsTextTestCases
Change-Id: I6c1773018f95855eb6599d66f6fb5923c7d48b03

1 files changed, 68 insertions, 0 deletions

diff --git a/hamcrest-core/src/main/java/org/hamcrest/core/Is.java b/hamcrest-core/src/main/java/org/hamcrest/core/Is.java
new file mode 100644
index 0000000..f9152e9
--- /dev/null
+++ b/hamcrest-core/src/main/java/org/hamcrest/core/Is.java
@@ -0,0 +1,68 @@
+package org.hamcrest.core;
+
+import static org.hamcrest.core.IsInstanceOf.instanceOf;
+import static org.hamcrest.core.IsEqual.equalTo;
+import org.hamcrest.Factory;
+import org.hamcrest.Matcher;
+import org.hamcrest.BaseMatcher;
+import org.hamcrest.Description;
+
+/**
+ * Decorates another Matcher, retaining the behavior but allowing tests
+ * to be slightly more expressive.
+ *
+ * eg. assertThat(cheese, equalTo(smelly))
+ * vs  assertThat(cheese, is(equalTo(smelly)))
+ */
+public class Is<T> extends BaseMatcher<T> {
+
+    private final Matcher<T> matcher;
+
+    public Is(Matcher<T> matcher) {
+        this.matcher = matcher;
+    }
+
+    public boolean matches(Object arg) {
+        return matcher.matches(arg);
+    }
+
+    public void describeTo(Description description) {
+        description.appendText("is ").appendDescriptionOf(matcher);
+    }
+    
+    /**
+     * Decorates another Matcher, retaining the behavior but allowing tests
+     * to be slightly more expressive.
+     *
+     * eg. assertThat(cheese, equalTo(smelly))
+     * vs  assertThat(cheese, is(equalTo(smelly)))
+     */
+    @Factory
+    public static <T> Matcher<T> is(Matcher<T> matcher) {
+        return new Is<T>(matcher);
+    }
+
+    /**
+     * This is a shortcut to the frequently used is(equalTo(x)).
+     *
+     * eg. assertThat(cheese, is(equalTo(smelly)))
+     * vs  assertThat(cheese, is(smelly))
+     */
+    @Factory
+    public static <T> Matcher<T> is(T value) {
+        return is(equalTo(value));
+    }
+
+    /**
+     * This is a shortcut to the frequently used is(instanceOf(SomeClass.class)).
+     *
+     * eg. assertThat(cheese, is(instanceOf(Cheddar.class)))
+     * vs  assertThat(cheese, is(Cheddar.class))
+     */
+    @Factory
+    public static Matcher<Object> is(Class<?> type) {
+        return is(instanceOf(type));
+    }
+
+}
+