Add adapter for real Value interface

Author: agentgt

jooby/src/main/java/io/jooby/spi/ValueContainer.java

@@ -0,0 +1,63 @@
+package io.jooby.spi;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+public interface ValueContainer {
+  
+  /**
+   * Get a value at the given position.
+   *
+   * @param index Position.
+   * @return A value at the given position.
+   */
+  @Nonnull ValueContainer get(@Nonnull int index);
+
+  /**
+   * Get a value that matches the given name.
+   *
+   * @param name Field name.
+   * @return Field value.
+   */
+  @Nonnull ValueContainer get(@Nonnull String name);
+  
+  @Nonnull String value();
+  
+  @Nullable String valueOrNull();
+  
+  /**
+   * True for missing values.
+   *
+   * @return True for missing values.
+   */
+  boolean isMissing();
+
+  /**
+   * The number of values this one has. For single values size is <code>0</code>.
+   *
+   * @return Number of values. Mainly for array and hash values.
+   */
+  int size();
+  
+  /**
+   * True if this value is an array/sequence (not single or hash).
+   *
+   * @return True if this value is an array/sequence.
+   */
+  boolean isArray();
+
+  /**
+   * True if this is a single value (not a hash or array).
+   *
+   * @return True if this is a single value (not a hash or array).
+   */
+  boolean isSingle();
+
+  /**
+   * True if this is a hash/object value (not single or array).
+   *
+   * @return True if this is a hash/object value (not single or array).
+   */
+  boolean isObject();
+
+}

jooby/src/main/java/io/jooby/spi/ValueConverter.java

@@ -0,0 +1,6 @@
+package io.jooby.spi;
+
+
+public interface ValueConverter {
+
+}

jooby/src/main/java/io/jooby/spi/ValueConverters.java

@@ -0,0 +1,6 @@
+package io.jooby.spi;
+
+
+public class ValueConverters {
+
+}