Create an intermediate summary xml file to ease summary report

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@293489 13f79535-47bb-0310-9956-ffa450edef68

checkstyle/src/plugin-resources/checkstyle-summary.xsl

@@ -0,0 +1,49 @@
+<!--
+ * ========================================================================
+ * 
+ * Copyright 2004 The Apache Software Foundation.
+ *
+ * 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.
+ * 
+ * ========================================================================
+-->
+<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+    <xsl:output method="xml" indent="yes"/>
+    <xsl:key name="errors-by-message" match="//error" use="@message"/>
+
+    <xsl:template match="/">
+        <errors>
+            <xsl:for-each select="//error">
+                <xsl:variable name="group-by">
+                    <xsl:value-of select="./@message"/>
+                </xsl:variable>
+                <xsl:if test="generate-id(.) = generate-id(key('errors-by-message',$group-by)[1])">
+                    <xsl:element name="error">
+                        <xsl:attribute name="severity">
+                            <xsl:value-of select="./@severity"/>
+                        </xsl:attribute>
+                        <xsl:attribute name="message">
+                            <xsl:value-of select="$group-by"/>
+                        </xsl:attribute>
+                        <xsl:attribute name="count">
+                            <xsl:value-of select="count(key('errors-by-message',$group-by))"/>
+                        </xsl:attribute>
+                    </xsl:element>
+                </xsl:if>
+            </xsl:for-each>
+        </errors>
+    </xsl:template>
+
+    <xsl:template match="text()"/>
+
+</xsl:stylesheet>