Refactor rename MutableHash to MutableValueInfo (and subsequent rename on methods etc)

ebean-api/src/main/java/io/ebean/bean/MutableValueInfo.java

@@ -0,0 +1,39 @@
+package io.ebean.bean;
+
+/**
+ * Holds information on mutable values (like plain beans stored as json).
+ * <p>
+ * Used internally in EntityBeanIntercept for dirty detection on mutable values.
+ * Typically dirty detection is based on a hash/checksum of json content or the
+ * original json content itself.
+ * <p>
+ * Refer to the mapping options {@code @DbJson(dirtyDetection)} and {@code @DbJson(keepSource)}.
+ */
+public interface MutableValueInfo {
+
+  /**
+   * Compares the given json to an internal value. Can be a hash/checksum comparison
+   * or a plain JSON string comparison (based on {@code @DbJson(keepSource)}).
+   *
+   * @return true if the value is considered unchanged (when comparing in json form).
+   */
+  boolean isEqualToJson(String json);
+
+  /**
+   * Compares the given object to an internal value.
+   * <p>
+   * This is used to support changelog/beanState. The implementation can serialize the
+   * object into json form and compare it against the original json.
+   */
+  boolean isEqualToObject(Object obj);
+
+  /**
+   * Creates a new instance from the internal json string.
+   * <p>
+   * This is used to provide an original/old value for change logging / persist listeners.
+   * This is only available for properties that have {@code @DbJson(keepSource=true)}.
+   */
+  default Object get() {
+    return null;
+  }
+}