Reorganize how configuration is loaded, add UUID/String Converters.

spring-data-rest-core/src/main/java/org/springframework/data/rest/core/convert/DelegatingConversionService.java

@@ -0,0 +1,71 @@
+package org.springframework.data.rest.core.convert;
+
+import java.util.Stack;
+
+import org.springframework.core.convert.ConversionService;
+import org.springframework.core.convert.ConverterNotFoundException;
+import org.springframework.core.convert.TypeDescriptor;
+
+/**
+ * @author Jon Brisbin <jbrisbin@vmware.com>
+ */
+public class DelegatingConversionService implements ConversionService {
+
+  private Stack<ConversionService> conversionServices = new Stack<ConversionService>();
+
+  public DelegatingConversionService() {
+  }
+
+  public DelegatingConversionService(ConversionService... svcs) {
+    addConversionServices(svcs);
+  }
+
+  public DelegatingConversionService addConversionServices(ConversionService... svcs) {
+    for (ConversionService svc : svcs) {
+      conversionServices.add(svc);
+    }
+    return this;
+  }
+
+  public DelegatingConversionService addConversionService(int atIndex, ConversionService svc) {
+    conversionServices.add(atIndex, svc);
+    return this;
+  }
+
+  @Override public boolean canConvert(Class<?> from, Class<?> to) {
+    for (ConversionService svc : conversionServices) {
+      if (svc.canConvert(from, to)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  @Override public boolean canConvert(TypeDescriptor from, TypeDescriptor to) {
+    for (ConversionService svc : conversionServices) {
+      if (svc.canConvert(from, to)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  @Override public <T> T convert(Object o, Class<T> type) {
+    for (ConversionService svc : conversionServices) {
+      if (svc.canConvert(o.getClass(), type)) {
+        return svc.convert(o, type);
+      }
+    }
+    throw new ConverterNotFoundException(TypeDescriptor.forObject(o), TypeDescriptor.valueOf(type));
+  }
+
+  @Override public Object convert(Object o, TypeDescriptor from, TypeDescriptor to) {
+    for (ConversionService svc : conversionServices) {
+      if (svc.canConvert(from, to)) {
+        return svc.convert(o, from, to);
+      }
+    }
+    throw new ConverterNotFoundException(from, to);
+  }
+
+}

spring-data-rest-core/src/main/java/org/springframework/data/rest/core/convert/StringToUUIDConverter.java

@@ -0,0 +1,14 @@
+package org.springframework.data.rest.core.convert;
+
+import java.util.UUID;
+
+import org.springframework.core.convert.converter.Converter;
+
+/**
+ * @author Jon Brisbin <jbrisbin@vmware.com>
+ */
+public class StringToUUIDConverter implements Converter<String, UUID> {
+  @Override public UUID convert(String s) {
+    return (null != s ? UUID.fromString(s) : null);
+  }
+}

spring-data-rest-core/src/main/java/org/springframework/data/rest/core/convert/UUIDToStringConverter.java

@@ -0,0 +1,14 @@
+package org.springframework.data.rest.core.convert;
+
+import java.util.UUID;
+
+import org.springframework.core.convert.converter.Converter;
+
+/**
+ * @author Jon Brisbin <jbrisbin@vmware.com>
+ */
+public class UUIDToStringConverter implements Converter<UUID, String> {
+  @Override public String convert(UUID uuid) {
+    return (null != uuid ? uuid.toString() : null);
+  }
+}