Add basic pattern matching

Adds a basic pattern matching implementation. Not perfect, but pretty
good, considering what we have to work with

1 files changed, 31 insertions, 0 deletions

diff --git a/base/src/main/java/bjc/utils/patterns/FunctionalPatternMatcher.java b/base/src/main/java/bjc/utils/patterns/FunctionalPatternMatcher.java
new file mode 100644
index 0000000..5a214d3
--- /dev/null
+++ b/base/src/main/java/bjc/utils/patterns/FunctionalPatternMatcher.java
@@ -0,0 +1,31 @@
+package bjc.utils.patterns;
+
+import bjc.functypes.*;
+
+/**
+ * A simple pattern matcher backed by a function.
+ * 
+ * @author Ben Culkin
+ *
+ * @param <ReturnType> The type returned by the matcher.
+ * @param <InputType> The type to match against.
+ */
+public class FunctionalPatternMatcher<ReturnType, InputType>
+	implements IPatternMatcher<ReturnType, InputType> {
+	
+	private final ThrowFunction<InputType, ReturnType, NonExhaustiveMatch> matcher;
+	
+	/**
+	 * Create a new function-backed pattern matcher.
+	 * 
+	 * @param matcher The function backing this matcher.
+	 */
+	public FunctionalPatternMatcher(ThrowFunction<InputType, ReturnType, NonExhaustiveMatch> matcher) {
+		this.matcher = matcher;
+	}
+
+	@Override
+	public ReturnType matchFor(InputType input) throws NonExhaustiveMatch {
+		return matcher.apply(input);
+	}
+}