/usr/include/avro/resolver.h is in libavro-dev 1.8.2-1.
This file is owned by root:root, with mode 0o644.
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#ifndef AVRO_RESOLVER_H
#define AVRO_RESOLVER_H
#ifdef __cplusplus
extern "C" {
#define CLOSE_EXTERN }
#else
#define CLOSE_EXTERN
#endif
#include <avro/schema.h>
#include <avro/value.h>
/*
* A <i>resolved value</i> is a special kind of value that knows how to
* implement Avro's schema resolution rules to translate between a
* writer schema and a reader schema. A resolved value doesn't store or
* process data itself; instead, it wraps an existing value instance.
*
* There are two resolved value classes. In the first (@ref
* avro_resolved_writer_t), the resolved value is an instance of the
* writer schema, and wraps an instance of the reader schema. This is
* used, for instance, when reading from an Avro data file; you want the
* end result to be a reader schema value, and the resolved value allows
* the file reader to ignore the schema resolution and simply fill in
* the values of the writer schema. You can only set the values of a
* resolved writer; you must use the original wrapped value to read.
*
* With other class (@ref avro_resolved_reader_t), the resolved value is
* an instance of the reader schema, and wraps an instance of the writer
* schema. This is used when resolving an existing Avro value to
* another schema; you've already got the value in the original (writer)
* schema, and want to transparently treat it as if it were an instance
* of the new (reader) schema. You can only read the values of a
* resolved reader; you must use the original wrapped value to write.
*
* For both classes, the “self” pointer of the resolved value is an
* avro_value_t pointer, which points at the wrapped value.
*/
/**
* Create a new resolved writer implementation for the given writer and
* reader schemas.
*/
avro_value_iface_t *
avro_resolved_writer_new(avro_schema_t writer_schema,
avro_schema_t reader_schema);
/**
* Creates a new resolved writer value.
*/
int
avro_resolved_writer_new_value(avro_value_iface_t *iface,
avro_value_t *value);
/**
* Sets the wrapped value for a resolved writer. This must be an
* instance of the reader schema. We create our own reference to the
* destination value.
*/
void
avro_resolved_writer_set_dest(avro_value_t *resolved,
avro_value_t *dest);
/**
* Clears the wrapped value for a resolved writer.
*/
void
avro_resolved_writer_clear_dest(avro_value_t *resolved);
/**
* Create a new resolved reader implementation for the given writer and
* reader schemas.
*/
avro_value_iface_t *
avro_resolved_reader_new(avro_schema_t writer_schema,
avro_schema_t reader_schema);
/**
* Creates a new resolved reader value.
*/
int
avro_resolved_reader_new_value(avro_value_iface_t *iface,
avro_value_t *value);
/**
* Sets the wrapped value for a resolved reader. This must be an
* instance of the reader schema. We create our own reference to the
* source value.
*/
void
avro_resolved_reader_set_source(avro_value_t *resolved,
avro_value_t *dest);
/**
* Clears the wrapped value for a resolved reader.
*/
void
avro_resolved_reader_clear_source(avro_value_t *resolved);
CLOSE_EXTERN
#endif
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