com.aerospike.client.exp.ExpOperation Maven / Gradle / Ivy
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/*
* Copyright 2012-2021 Aerospike, Inc.
*
* Portions may be licensed to Aerospike, Inc. under one or more contributor
* license agreements WHICH ARE COMPATIBLE WITH THE APACHE LICENSE, VERSION 2.0.
*
* Licensed 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.
*/
package com.aerospike.client.exp;
import com.aerospike.client.Operation;
import com.aerospike.client.Value;
import com.aerospike.client.util.Packer;
/**
* Expression operations.
*/
public final class ExpOperation {
/**
* Create operation that performs an expression that writes to a record bin.
* Requires server version 5.6.0+.
*
* @param binName name of bin to store expression result
* @param exp expression to evaluate
* @param flags expression write flags. See {@link com.aerospike.client.exp.ExpWriteFlags}
*/
public static Operation write(String binName, Expression exp, int flags) {
return createOperation(Operation.Type.EXP_MODIFY, binName, exp, flags);
}
/**
* Create operation that performs a read expression.
* Requires server version 5.6.0+.
*
* @param name variable name of read expression result. This name can be used as the
* bin name when retrieving bin results from the record.
* @param exp expression to evaluate
* @param flags expression read flags. See {@link com.aerospike.client.exp.ExpReadFlags}
*/
public static Operation read(String name, Expression exp, int flags) {
return createOperation(Operation.Type.EXP_READ, name, exp, flags);
}
private static Operation createOperation(Operation.Type type, String name, Expression exp, int flags) {
Packer packer = new Packer();
packer.packArrayBegin(2);
byte[] b = exp.getBytes();
packer.packByteArray(b, 0, b.length);
packer.packInt(flags);
return new Operation(type, name, Value.get(packer.toByteArray()));
}
}