Expose InlineMorph string representation.

E.g., for debugging purposes.

Author: blackwinter

metamorph/src/main/java/org/metafacture/metamorph/InlineMorph.java

@@ -55,6 +55,10 @@
  */
 public final class InlineMorph {
 
+    private static final String XML_BOILERPLATE = "<?xml version='1.1' encoding='UTF-8'?>\n";
+    private static final String METAMORPH_BOILERPLATE = "<metamorph version='1'\n    xmlns='http://www.culturegraph.org/metamorph'>";
+    private static final String FINISH_METAMORPH_BOILERPLATE = "</metamorph>\n";
+
     private final StringBuilder scriptBuilder = new StringBuilder();
 
     private String systemId;
@@ -126,11 +130,11 @@ private void appendBoilerplate(final String line) {
     }
 
     private void appendXmlBoilerplate() {
-        scriptBuilder.append("<?xml version='1.1' encoding='UTF-8'?>\n");
+        scriptBuilder.append(XML_BOILERPLATE);
     }
 
     private void appendMetamorphBoilerplate() {
-        scriptBuilder.append("<metamorph version='1'\n    xmlns='http://www.culturegraph.org/metamorph'>");
+        scriptBuilder.append(METAMORPH_BOILERPLATE);
     }
 
     /**
@@ -145,18 +149,28 @@ public Metamorph create() {
 
     private void finishBoilerplate() {
         if (needFinishMetamorphBoilerplate) {
-            scriptBuilder.append("</metamorph>\n");
+            scriptBuilder.append(FINISH_METAMORPH_BOILERPLATE);
             needFinishMetamorphBoilerplate = false;
         }
     }
 
     private InputSource createScriptSource() {
         final InputSource scriptSource = new InputSource();
         scriptSource.setSystemId(systemId);
-        scriptSource.setCharacterStream(new StringReader(scriptBuilder.toString()));
+        scriptSource.setCharacterStream(new StringReader(toString()));
         return scriptSource;
     }
 
+    /**
+     * Returns the string representation of this Morph script.
+     *
+     * @return the Morph script
+     */
+    @Override
+    public String toString() {
+        return scriptBuilder.toString() + (needFinishMetamorphBoilerplate ? FINISH_METAMORPH_BOILERPLATE : "");
+    }
+
     /**
      * Creates a {@link Metamorph} instance. The {@code Metamorph} instance will
      * be connected to the receiver passed as argument.

metamorph/src/test/java/org/metafacture/metamorph/InlineMorphTest.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2021 hbz NRW
+ *
+ * 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.
+ */
+
+package org.metafacture.metamorph;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Arrays;
+
+public final class InlineMorphTest {
+
+    private static final String PREFIX = "<?xml version='1.1' encoding='UTF-8'?>\n" +
+        "<metamorph version='1'\n    xmlns='http://www.culturegraph.org/metamorph'>";
+
+    private static final String SUFFIX = "\n</metamorph>\n";
+
+    @Test
+    public void shouldProvideEmptyStringRepresentation() {
+        Assert.assertEquals("", InlineMorph.in(this).toString());
+    }
+
+    @Test
+    public void shouldProvideScriptStringRepresentation() {
+        final InlineMorph morph = InlineMorph.in(this);
+
+        final String[] script = new String[]{
+            "<rules>",
+            "  <data source='litA'>",
+            "    <lookup>",
+            "      <entry name='cat' value='mammal' />",
+            "      <entry name='dog' value='mammal' />",
+            "    </lookup>",
+            "  </data>",
+            "</rules>"
+        };
+
+        Arrays.stream(script).forEach(morph::with);
+
+        Assert.assertEquals(PREFIX + String.join("\n", script) + SUFFIX, morph.toString());
+    }
+
+}