fixed issues rdicroce#13 - graphicsImage formatter

jsf-exporter-core/src/main/java/com/lapis/jsfexporter/impl/value/GraphicsImageFormatter.java

@@ -0,0 +1,23 @@
+package com.lapis.jsfexporter.impl.value;
+
+import com.lapis.jsfexporter.spi.IValueFormatter;
+
+import javax.faces.component.html.HtmlGraphicImage;
+import javax.faces.context.FacesContext;
+
+public class GraphicsImageFormatter implements IValueFormatter<HtmlGraphicImage> {
+    @Override
+    public Class<HtmlGraphicImage> getSupportedClass() {
+        return HtmlGraphicImage.class;
+    }
+
+    @Override
+    public int getPrecedence() {
+        return 0;
+    }
+
+    @Override
+    public String formatValue(FacesContext context, HtmlGraphicImage component) {
+        return component.getAlt();
+    }
+}

jsf-exporter-core/src/main/resources/META-INF/services/com.lapis.jsfexporter.spi.IValueFormatter

@@ -3,4 +3,5 @@ com.lapis.jsfexporter.impl.value.DefaultFormatter
 com.lapis.jsfexporter.impl.value.OutputFormatFormatter
 com.lapis.jsfexporter.impl.value.PanelGroupFormatter
 com.lapis.jsfexporter.impl.value.SelectOneFormatter
-com.lapis.jsfexporter.impl.value.ValueHolderFormatter
+com.lapis.jsfexporter.impl.value.ValueHolderFormatter
+com.lapis.jsfexporter.impl.value.GraphicsImageFormatter

jsf-exporter-test/src/main/webapp/faces/primefaces/dataTableNonLazy.xhtml

@@ -92,6 +92,12 @@
                 </p:column>
                 <p:column headerText="Button">
                     <p:commandButton value="Click me!"/>
+                </p:column>
+                <p:column headerText="Image - HTML" style="text-align: center;">
+                    <h:graphicImage library="images" name="image.png" alt="this is image's alt"/>
+                </p:column>
+                <p:column headerText="Image - Primefaces" style="text-align: center;">
+                    <p:graphicImage library="images" name="image2.gif"  alt="this is second image's alt"/>
                 </p:column>
 				<p:column headerText="Actions" exportable="false">
 					<p:rowEditor/>