From b1741d1b461795f7de1b2ebccd24405fb875dddd Mon Sep 17 00:00:00 2001
From: Gilles Sadowski <erans@apache.org>
Date: Thu, 16 Aug 2012 21:00:39 +0000
Subject: [PATCH] Precondition check.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1374054 13f79535-47bb-0310-9956-ffa450edef68
---
 .../gauss/LegendreHighPrecisionRuleFactory.java            | 7 +++++++
 .../analysis/integration/gauss/LegendreRuleFactory.java    | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/src/main/java/org/apache/commons/math3/analysis/integration/gauss/LegendreHighPrecisionRuleFactory.java b/src/main/java/org/apache/commons/math3/analysis/integration/gauss/LegendreHighPrecisionRuleFactory.java
index cf17713b5..09c580044 100644
--- a/src/main/java/org/apache/commons/math3/analysis/integration/gauss/LegendreHighPrecisionRuleFactory.java
+++ b/src/main/java/org/apache/commons/math3/analysis/integration/gauss/LegendreHighPrecisionRuleFactory.java
@@ -19,6 +19,8 @@ package org.apache.commons.math3.analysis.integration.gauss;
 import java.math.MathContext;
 import java.math.BigDecimal;
 import org.apache.commons.math3.util.Pair;
+import org.apache.commons.math3.exception.NotStrictlyPositiveException;
+import org.apache.commons.math3.exception.util.LocalizedFormats;
 
 /**
  * Factory that creates Gauss-type quadrature rule using Legendre polynomials.
@@ -63,6 +65,11 @@ public class LegendreHighPrecisionRuleFactory extends BaseRuleFactory<BigDecimal
      */
     @Override
     protected Pair<BigDecimal[], BigDecimal[]> computeRule(int numberOfPoints) {
+        if (numberOfPoints <= 0) {
+            throw new NotStrictlyPositiveException(LocalizedFormats.NUMBER_OF_POINTS,
+                                                   numberOfPoints);
+        }
+
         if (numberOfPoints == 1) {
             // Break recursion.
             return new Pair<BigDecimal[], BigDecimal[]>(new BigDecimal[] { BigDecimal.ZERO },
diff --git a/src/main/java/org/apache/commons/math3/analysis/integration/gauss/LegendreRuleFactory.java b/src/main/java/org/apache/commons/math3/analysis/integration/gauss/LegendreRuleFactory.java
index e3471ede5..a794acce9 100644
--- a/src/main/java/org/apache/commons/math3/analysis/integration/gauss/LegendreRuleFactory.java
+++ b/src/main/java/org/apache/commons/math3/analysis/integration/gauss/LegendreRuleFactory.java
@@ -17,6 +17,8 @@
 package org.apache.commons.math3.analysis.integration.gauss;
 
 import org.apache.commons.math3.util.Pair;
+import org.apache.commons.math3.exception.NotStrictlyPositiveException;
+import org.apache.commons.math3.exception.util.LocalizedFormats;
 
 /**
  * Factory that creates Gauss-type quadrature rule using Legendre polynomials.
@@ -35,6 +37,11 @@ public class LegendreRuleFactory extends BaseRuleFactory<Double> {
      */
     @Override
     protected Pair<Double[], Double[]> computeRule(int numberOfPoints) {
+        if (numberOfPoints <= 0) {
+            throw new NotStrictlyPositiveException(LocalizedFormats.NUMBER_OF_POINTS,
+                                                   numberOfPoints);
+        }
+
         if (numberOfPoints == 1) {
             // Break recursion.
             return new Pair<Double[], Double[]>(new Double[] { 0d },