1 files changed, 135 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/math3/geometry/euclidean/oned/Interval.java b/src/main/java/org/apache/commons/math3/geometry/euclidean/oned/Interval.java
new file mode 100644
index 0000000..ca15231
--- /dev/null
+++ b/src/main/java/org/apache/commons/math3/geometry/euclidean/oned/Interval.java
@@ -0,0 +1,135 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.commons.math3.geometry.euclidean.oned;
+
+import org.apache.commons.math3.geometry.partitioning.Region.Location;
+import org.apache.commons.math3.exception.NumberIsTooSmallException;
+import org.apache.commons.math3.exception.util.LocalizedFormats;
+
+
+/** This class represents a 1D interval.
+ * @see IntervalsSet
+ * @since 3.0
+ */
+public class Interval {
+
+    /** The lower bound of the interval. */
+    private final double lower;
+
+    /** The upper bound of the interval. */
+    private final double upper;
+
+    /** Simple constructor.
+     * @param lower lower bound of the interval
+     * @param upper upper bound of the interval
+     */
+    public Interval(final double lower, final double upper) {
+        if (upper < lower) {
+            throw new NumberIsTooSmallException(LocalizedFormats.ENDPOINTS_NOT_AN_INTERVAL,
+                                                upper, lower, true);
+        }
+        this.lower = lower;
+        this.upper = upper;
+    }
+
+    /** Get the lower bound of the interval.
+     * @return lower bound of the interval
+     * @since 3.1
+     */
+    public double getInf() {
+        return lower;
+    }
+
+    /** Get the lower bound of the interval.
+     * @return lower bound of the interval
+     * @deprecated as of 3.1, replaced by {@link #getInf()}
+     */
+    @Deprecated
+    public double getLower() {
+        return getInf();
+    }
+
+    /** Get the upper bound of the interval.
+     * @return upper bound of the interval
+     * @since 3.1
+     */
+    public double getSup() {
+        return upper;
+    }
+
+    /** Get the upper bound of the interval.
+     * @return upper bound of the interval
+     * @deprecated as of 3.1, replaced by {@link #getSup()}
+     */
+    @Deprecated
+    public double getUpper() {
+        return getSup();
+    }
+
+    /** Get the size of the interval.
+     * @return size of the interval
+     * @since 3.1
+     */
+    public double getSize() {
+        return upper - lower;
+    }
+
+    /** Get the length of the interval.
+     * @return length of the interval
+     * @deprecated as of 3.1, replaced by {@link #getSize()}
+     */
+    @Deprecated
+    public double getLength() {
+        return getSize();
+    }
+
+    /** Get the barycenter of the interval.
+     * @return barycenter of the interval
+     * @since 3.1
+     */
+    public double getBarycenter() {
+        return 0.5 * (lower + upper);
+    }
+
+    /** Get the midpoint of the interval.
+     * @return midpoint of the interval
+     * @deprecated as of 3.1, replaced by {@link #getBarycenter()}
+     */
+    @Deprecated
+    public double getMidPoint() {
+        return getBarycenter();
+    }
+
+    /** Check a point with respect to the interval.
+     * @param point point to check
+     * @param tolerance tolerance below which points are considered to
+     * belong to the boundary
+     * @return a code representing the point status: either {@link
+     * Location#INSIDE}, {@link Location#OUTSIDE} or {@link Location#BOUNDARY}
+     * @since 3.1
+     */
+    public Location checkPoint(final double point, final double tolerance) {
+        if (point < lower - tolerance || point > upper + tolerance) {
+            return Location.OUTSIDE;
+        } else if (point > lower + tolerance && point < upper - tolerance) {
+            return Location.INSIDE;
+        } else {
+            return Location.BOUNDARY;
+        }
+    }
+
+}