Update request/response GraphQL classes

This commit decouples the HTTP layer from the expected request and
response messages expected with GraphQL.

spring-graphql-web/src/main/java/org/springframework/graphql/GraphQLHttpRequest.java

@@ -1,46 +0,0 @@
-package org.springframework.graphql;
-
-import org.springframework.http.HttpHeaders;
-import org.springframework.util.MultiValueMap;
-
-import java.util.Map;
-
-public class GraphQLHttpRequest {
-    private final String query;
-    private final String operationName;
-    private final Map<String, Object> variables;
-    private final HttpHeaders httpHeaders;
-    private final MultiValueMap<String, String> requestParams;
-
-    public GraphQLHttpRequest(String query,
-                              String operationName,
-                              Map<String, Object> variables,
-                              HttpHeaders httpHeaders,
-                              MultiValueMap<String, String> requestParams) {
-        this.query = query;
-        this.operationName = operationName;
-        this.variables = variables;
-        this.httpHeaders = httpHeaders;
-        this.requestParams = requestParams;
-    }
-
-    public String getQuery() {
-        return query;
-    }
-
-    public String getOperationName() {
-        return operationName;
-    }
-
-    public Map<String, Object> getVariables() {
-        return variables;
-    }
-
-    public HttpHeaders getHttpHeaders() {
-        return httpHeaders;
-    }
-
-    public MultiValueMap<String, String> getRequestParams() {
-        return requestParams;
-    }
-}

spring-graphql-web/src/main/java/org/springframework/graphql/GraphQLHttpResponse.java

@@ -1,40 +0,0 @@
-package org.springframework.graphql;
-
-import org.springframework.http.HttpHeaders;
-
-import java.util.List;
-import java.util.Map;
-
-public class GraphQLHttpResponse {
-
-    private final Object data;
-    private final List<Map<String, Object>> errors;
-    private final Map<String, Object> extensions;
-    private final HttpHeaders httpHeaders;
-
-    public GraphQLHttpResponse(Object data,
-                               List<Map<String, Object>> errors,
-                               Map<String, Object> extensions,
-                               HttpHeaders httpHeaders) {
-        this.data = data;
-        this.errors = errors;
-        this.extensions = extensions;
-        this.httpHeaders = httpHeaders;
-    }
-
-    public Object getData() {
-        return data;
-    }
-
-    public List<Map<String, Object>> getErrors() {
-        return errors;
-    }
-
-    public Map<String, Object> getExtensions() {
-        return extensions;
-    }
-
-    public HttpHeaders getHttpHeaders() {
-        return httpHeaders;
-    }
-}

spring-graphql-web/src/main/java/org/springframework/graphql/GraphQLRequestBody.java

@@ -0,0 +1,53 @@
+package org.springframework.graphql;
+
+import java.util.Collections;
+import java.util.Map;
+
+import org.springframework.lang.Nullable;
+
+/**
+ * @author Andreas Marek
+ * @author Brian Clozel
+ */
+public class GraphQLRequestBody {
+
+	private String query;
+
+	private String operationName;
+
+	private Map<String, Object> variables = Collections.emptyMap();
+
+	public GraphQLRequestBody(String query, String operationName, Map<String, Object> variables) {
+		this.query = query;
+		this.operationName = operationName;
+		this.variables = variables;
+	}
+
+	public GraphQLRequestBody() {
+	}
+
+	@Nullable
+	public String getQuery() {
+		return this.query;
+	}
+
+	public void setQuery(String query) {
+		this.query = query;
+	}
+
+	public String getOperationName() {
+		return this.operationName;
+	}
+
+	public void setOperationName(String operationName) {
+		this.operationName = operationName;
+	}
+
+	public Map<String, Object> getVariables() {
+		return this.variables;
+	}
+
+	public void setVariables(Map<String, Object> variables) {
+		this.variables = variables;
+	}
+}

spring-graphql-web/src/main/java/org/springframework/graphql/GraphQLResponseBody.java

@@ -0,0 +1,36 @@
+package org.springframework.graphql;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+public class GraphQLResponseBody<T> {
+
+	private T data;
+
+	private List<Map<String, Object>> errors = Collections.emptyList();
+
+	public GraphQLResponseBody() {
+	}
+
+	public GraphQLResponseBody(T data) {
+		this.data = data;
+		this.errors = errors;
+	}
+
+	public T getData() {
+		return this.data;
+	}
+
+	public void setData(T data) {
+		this.data = data;
+	}
+
+	public List<Map<String, Object>> getErrors() {
+		return this.errors;
+	}
+
+	public void setErrors(List<Map<String, Object>> errors) {
+		this.errors = errors;
+	}
+}