Re-approach record-based Metafix implementation (#35)

Starting from a record map, not the event-based morph classes

Following Catmandu Fix cheat sheet at
https://github.com/LibreCat/Catmandu/wiki/Fixes-Cheat-Sheet

Author: fsteeg

org.metafacture.fix.web/src/main/java/org/metafacture/fix/web/FixServlet.java

@@ -1,6 +1,6 @@
 package org.metafacture.fix.web;
 
-import org.metafacture.metamorph.Metafix;
+import org.metafacture.fix.FixStandaloneSetup;
 import org.metafacture.runner.Flux;
 
 import org.antlr.runtime.RecognitionException;
@@ -106,7 +106,7 @@ private boolean process(final HttpServletRequest request, final HttpServletRespo
     }
 
     private String absPathToTempFile(final String content, final String suffix) throws IOException {
-        return Metafix.absPathToTempFile(new StringReader(content), suffix);
+        return FixStandaloneSetup.absPathToTempFile(new StringReader(content), suffix);
     }
 
 }

org.metafacture.fix/src/main/java/org/metafacture/fix/FixStandaloneSetup.java

@@ -1,5 +1,23 @@
 package org.metafacture.fix;
 
+import org.metafacture.fix.fix.Fix;
+
+import org.eclipse.emf.common.util.URI;
+import org.eclipse.emf.ecore.resource.Resource;
+import org.eclipse.xtext.resource.XtextResource;
+import org.eclipse.xtext.resource.XtextResourceSet;
+import org.eclipse.xtext.util.CancelIndicator;
+import org.eclipse.xtext.validation.CheckMode;
+import org.eclipse.xtext.validation.IResourceValidator;
+import org.eclipse.xtext.validation.Issue;
+import com.google.common.io.CharStreams;
+import com.google.inject.Injector;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.Reader;
+
 /**
  * Initialization support for running Xtext languages without Equinox extension registry.
  */
@@ -12,4 +30,38 @@ public static void doSetup() {
         new FixStandaloneSetup().createInjectorAndDoEMFRegistration();
     }
 
+    public static Fix parseFix(final Reader fixDef) {
+        // TODO: do this only once per application
+        final Injector injector = new FixStandaloneSetup().createInjectorAndDoEMFRegistration();
+        FixStandaloneSetup.doSetup();
+
+        try {
+            final URI uri = URI.createFileURI(absPathToTempFile(fixDef, ".fix"));
+            final Resource resource = injector.getInstance(XtextResourceSet.class).getResource(uri, true);
+            final IResourceValidator validator = ((XtextResource) resource).getResourceServiceProvider().getResourceValidator();
+
+            for (final Issue issue : validator.validate(resource, CheckMode.ALL, CancelIndicator.NullImpl)) {
+                System.err.println(issue.getMessage());
+            }
+
+            return (Fix) resource.getContents().get(0);
+        }
+        catch (final IOException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public static String absPathToTempFile(final Reader fixDef, final String suffix) throws IOException {
+        // TODO: avoid temp file creation
+        final File file = File.createTempFile("metafix", suffix);
+        file.deleteOnExit();
+
+        try (FileWriter out = new FileWriter(file)) {
+            CharStreams.copy(fixDef, out);
+        }
+
+        return file.getAbsolutePath();
+    }
+
 }