Update #0 - First Release

sources/main/java/com/google/common/math/MathPreconditions.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2011 The Guava Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied.  See the License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+package com.google.common.math;
+
+import java.math.BigInteger;
+
+import javax.annotation.Nullable;
+
+import com.google.common.annotations.GwtCompatible;
+
+/**
+ * A collection of preconditions for math functions.
+ *
+ * @author Louis Wasserman
+ */
+@GwtCompatible
+final class MathPreconditions {
+	static int checkPositive(@Nullable String role, int x) {
+		if (x <= 0) {
+			throw new IllegalArgumentException(role + " (" + x + ") must be > 0");
+		}
+		return x;
+	}
+
+	static long checkPositive(@Nullable String role, long x) {
+		if (x <= 0) {
+			throw new IllegalArgumentException(role + " (" + x + ") must be > 0");
+		}
+		return x;
+	}
+
+	static BigInteger checkPositive(@Nullable String role, BigInteger x) {
+		if (x.signum() <= 0) {
+			throw new IllegalArgumentException(role + " (" + x + ") must be > 0");
+		}
+		return x;
+	}
+
+	static int checkNonNegative(@Nullable String role, int x) {
+		if (x < 0) {
+			throw new IllegalArgumentException(role + " (" + x + ") must be >= 0");
+		}
+		return x;
+	}
+
+	static long checkNonNegative(@Nullable String role, long x) {
+		if (x < 0) {
+			throw new IllegalArgumentException(role + " (" + x + ") must be >= 0");
+		}
+		return x;
+	}
+
+	static BigInteger checkNonNegative(@Nullable String role, BigInteger x) {
+		if (x.signum() < 0) {
+			throw new IllegalArgumentException(role + " (" + x + ") must be >= 0");
+		}
+		return x;
+	}
+
+	static double checkNonNegative(@Nullable String role, double x) {
+		if (!(x >= 0)) { // not x < 0, to work with NaN.
+			throw new IllegalArgumentException(role + " (" + x + ") must be >= 0");
+		}
+		return x;
+	}
+
+	static void checkRoundingUnnecessary(boolean condition) {
+		if (!condition) {
+			throw new ArithmeticException("mode was UNNECESSARY, but rounding was necessary");
+		}
+	}
+
+	static void checkInRange(boolean condition) {
+		if (!condition) {
+			throw new ArithmeticException("not in range");
+		}
+	}
+
+	static void checkNoOverflow(boolean condition) {
+		if (!condition) {
+			throw new ArithmeticException("overflow");
+		}
+	}
+
+	private MathPreconditions() {
+	}
+}