From 8b31f08c8e3dfd5887ca4c5810e43f7170182fe4 Mon Sep 17 00:00:00 2001
From: Magesh Umasankar <umagesh@apache.org>
Date: Tue, 17 Jun 2003 15:49:00 +0000
Subject: [PATCH] Throw a build exception if a public constructor that takes in
 a Reader as its sole argument is absent.

PR: 20768


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@274673 13f79535-47bb-0310-9956-ffa450edef68
---
 .../apache/tools/ant/filters/util/ChainReaderHelper.java   | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/main/org/apache/tools/ant/filters/util/ChainReaderHelper.java b/src/main/org/apache/tools/ant/filters/util/ChainReaderHelper.java
index ef1b59dd2..7267d7505 100644
--- a/src/main/org/apache/tools/ant/filters/util/ChainReaderHelper.java
+++ b/src/main/org/apache/tools/ant/filters/util/ChainReaderHelper.java
@@ -185,14 +185,21 @@ public final class ChainReaderHelper {
                                 final Constructor[] constructors =
                                     clazz.getConstructors();
                                 int j = 0;
+                                boolean consPresent = false;
                                 for (; j < constructors.length; j++) {
                                     Class[] types = constructors[j]
                                                       .getParameterTypes();
                                     if (types.length == 1 &&
                                         types[0].isAssignableFrom(Reader.class)) {
+                                        consPresent = true;
                                         break;
                                     }
                                 }
+                                if ( !consPresent ) {
+                                    throw new BuildException( className +
+                                            " does not define a public constructor" +
+                                            " that takes in a Reader as its single argument.");
+                                }
                                 final Reader[] rdr = {instream};
                                 instream =
                                     (Reader) constructors[j].newInstance(rdr);