core/include/ignite/cache/query/query_fields_cursor.h

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/*
 * Copyright 2019 GridGain Systems, Inc. and Contributors.
 *
 * Licensed under the GridGain Community Edition License (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.gridgain.com/products/software/community-edition/gridgain-community-edition-license
 *
 * 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 _IGNITE_CACHE_QUERY_QUERY_FIELDS_CURSOR
#define _IGNITE_CACHE_QUERY_QUERY_FIELDS_CURSOR
 
#include <vector>
 
#include <ignite/common/concurrent.h>
#include <ignite/ignite_error.h>
 
#include "ignite/cache/cache_entry.h"
#include "ignite/cache/query/query_fields_row.h"
#include "ignite/impl/cache/query/query_impl.h"
#include "ignite/impl/operations.h"
 
namespace ignite
{
    namespace cache
    {
        namespace query
        {
            class QueryFieldsCursor
            {
            public:
                QueryFieldsCursor() : impl(0)
                {
                    // No-op.
                }
 
                QueryFieldsCursor(impl::cache::query::QueryCursorImpl* impl) : impl(impl)
                {
                    // No-op.
                }
                
                bool HasNext()
                {
                    IgniteError err;
 
                    bool res = HasNext(err);
 
                    IgniteError::ThrowIfNeeded(err);
 
                    return res;
                }
 
                bool HasNext(IgniteError& err)
                {
                    impl::cache::query::QueryCursorImpl* impl0 = impl.Get();
 
                    if (impl0)
                        return impl0->HasNext(err);
                    else
                    {
                        err = IgniteError(IgniteError::IGNITE_ERR_GENERIC, 
                            "Instance is not usable (did you check for error?).");
 
                        return false;
                    }
                }
 
                QueryFieldsRow GetNext()
                {
                    IgniteError err;
 
                    QueryFieldsRow res = GetNext(err);
 
                    IgniteError::ThrowIfNeeded(err);
 
                    return res;
                }
 
                QueryFieldsRow GetNext(IgniteError& err)
                {
                    impl::cache::query::QueryCursorImpl* impl0 = impl.Get();
 
                    if (impl0)
                        return impl0->GetNextRow(err);
                    else
                    {
                        err = IgniteError(IgniteError::IGNITE_ERR_GENERIC,
                            "Instance is not usable (did you check for error?).");
 
                        return QueryFieldsRow();
                    }
                }
 
                bool IsValid() const
                {
                    return impl.IsValid();
                }
 
            private:
                ignite::common::concurrent::SharedPointer<impl::cache::query::QueryCursorImpl> impl;
            };
        }
    }    
}
 
#endif //_IGNITE_CACHE_QUERY_QUERY_FIELDS_CURSOR