CSVFormat.validate() throws IllegalStateException instead of IllegalArgumentException because the method validates the state of the object.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1397876 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/csv/CSVFormat.java

@@ -168,29 +168,31 @@ public class CSVFormat implements Serializable {
     }
 
     /**
-     * Verifies the consistency of the parameters and throws an IllegalArgumentException if necessary.
+     * Verifies the consistency of the parameters and throws an IllegalStateException if necessary.
+     * 
+     * @throws IllegalStateException
      */
-    void validate() throws IllegalArgumentException {
+    void validate() throws IllegalStateException {
         if (delimiter == encapsulator) {
-            throw new IllegalArgumentException("The encapsulator character and the delimiter cannot be the same ('" + encapsulator + ")");
+            throw new IllegalStateException("The encapsulator character and the delimiter cannot be the same ('" + encapsulator + ")");
         }
 
         if (delimiter == escape) {
-            throw new IllegalArgumentException("The escape character and the delimiter cannot be the same ('" + escape + "')");
+            throw new IllegalStateException("The escape character and the delimiter cannot be the same ('" + escape + "')");
         }
 
         if (delimiter == commentStart) {
-            throw new IllegalArgumentException("The comment start character and the delimiter cannot be the same ('" + commentStart + 
+            throw new IllegalStateException("The comment start character and the delimiter cannot be the same ('" + commentStart + 
                     "')");
         }
 
         if (encapsulator != null && encapsulator == commentStart) {
-            throw new IllegalArgumentException("The comment start character and the encapsulator cannot be the same ('" + commentStart + 
+            throw new IllegalStateException("The comment start character and the encapsulator cannot be the same ('" + commentStart + 
                     "')");
         }
 
         if (escape != null && escape == commentStart) {
-            throw new IllegalArgumentException("The comment start and the escape character cannot be the same ('" + commentStart + "')");
+            throw new IllegalStateException("The comment start and the escape character cannot be the same ('" + commentStart + "')");
         }
     }
 

src/test/java/org/apache/commons/csv/CSVFormatTest.java

@@ -113,21 +113,21 @@ public class CSVFormatTest {
         try {
             format.withDelimiter('!').withEscape('!').validate();
             fail();
-        } catch (final IllegalArgumentException e) {
+        } catch (final IllegalStateException e) {
             // expected
         }
 
         try {
             format.withDelimiter('!').withCommentStart('!').validate();
             fail();
-        } catch (final IllegalArgumentException e) {
+        } catch (final IllegalStateException e) {
             // expected
         }
 
         try {
             format.withEncapsulator('!').withCommentStart('!').validate();
             fail();
-        } catch (final IllegalArgumentException e) {
+        } catch (final IllegalStateException e) {
             // expected
         }
 
@@ -136,7 +136,7 @@ public class CSVFormatTest {
         try {
             format.withEscape('!').withCommentStart('!').validate();
             fail();
-        } catch (final IllegalArgumentException e) {
+        } catch (final IllegalStateException e) {
             // expected
         }
 
@@ -146,7 +146,7 @@ public class CSVFormatTest {
         try {
             format.withEncapsulator('!').withDelimiter('!').validate();
             fail();
-        } catch (final IllegalArgumentException e) {
+        } catch (final IllegalStateException e) {
             // expected
         }
     }