#1147 - Refactor move DbMigration internals into io.ebeaninternal - change to use DbMigration.create() - initial move

src/main/java/io/ebeaninternal/dbmigration/migrationreader/MigrationXmlReader.java

@@ -0,0 +1,62 @@
+package io.ebeaninternal.dbmigration.migrationreader;
+
+
+import io.ebeaninternal.dbmigration.migration.Migration;
+
+import javax.xml.bind.JAXBContext;
+import javax.xml.bind.JAXBException;
+import javax.xml.bind.Unmarshaller;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * Reads a migration xml document returning the Migration.
+ */
+public class MigrationXmlReader {
+
+  private MigrationXmlReader() {
+  }
+
+  /**
+   * Read and return a Migration from an xml document at the given resource path.
+   */
+  public static Migration read(String resourcePath) {
+
+    InputStream is = MigrationXmlReader.class.getResourceAsStream(resourcePath);
+    if (is == null) {
+      throw new IllegalArgumentException("No resource found for path [" + resourcePath + "]");
+    }
+
+    return read(is);
+  }
+
+  /**
+   * Read and return a Migration from a migration xml file.
+   */
+  public static Migration read(File migrationFile) {
+
+    try (FileInputStream is = new FileInputStream(migrationFile)) {
+      return read(is);
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  /**
+   * Read and return a Migration from an xml document.
+   */
+  public static Migration read(InputStream is) {
+
+    try {
+      JAXBContext jaxbContext = JAXBContext.newInstance(Migration.class);
+      Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
+      return (Migration) unmarshaller.unmarshal(is);
+
+    } catch (JAXBException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+}

src/main/java/io/ebeaninternal/dbmigration/migrationreader/MigrationXmlWriter.java

@@ -0,0 +1,51 @@
+package io.ebeaninternal.dbmigration.migrationreader;
+
+
+import io.ebeaninternal.dbmigration.migration.Migration;
+
+import javax.xml.bind.JAXBContext;
+import javax.xml.bind.JAXBException;
+import javax.xml.bind.Marshaller;
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+
+/**
+ * Simple writer for output of the Migration/ChangeSet as an XML document.
+ */
+public class MigrationXmlWriter {
+
+  private final String comment;
+
+  public MigrationXmlWriter(String comment) {
+    this.comment = comment;
+  }
+
+  /**
+   * Write a Migration as a standalone XML document to a file.
+   */
+  public void write(Migration migration, File file) {
+
+    try (FileWriter writer = new FileWriter(file)) {
+
+      writer.write("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n");
+      writer.write("<!DOCTYPE xml>\n");
+      if (comment != null) {
+        writer.write("<!-- ");
+        writer.write(comment);
+        writer.write(" -->\n");
+      }
+
+      JAXBContext jaxbContext = JAXBContext.newInstance(Migration.class);
+      Marshaller marshaller = jaxbContext.createMarshaller();
+      marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
+      marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
+
+      marshaller.marshal(migration, writer);
+
+    } catch (IOException | JAXBException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+}