content: /*
   * Copyright 2012-2025 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 java.io.Serializable;
  import java.util.Arrays;
  
  import com.aerospike.client.command.Command;
  import com.aerospike.client.util.Crypto;
  import com.aerospike.client.util.Packer;
  
  /**
   * Packed expression byte instructions.
   */
  public final class Expression implements Serializable {
  	private static final long serialVersionUID = 1L;
  
  	private final byte[] bytes;
  
  	/**
  	 * Expression constructor used by {@link Exp#build(Exp)}
  	 */
  	Expression(Exp exp) {
  		Packer packer = new Packer();
  		exp.pack(packer);
  		packer.createBuffer();
  		exp.pack(packer);
  		bytes = packer.getBuffer();
  	}
  
  	/**
  	 * Expression constructor for packed expression instructions.
  	 */
  	Expression(byte[] bytes) {
  		this.bytes = bytes;
  	}
  
  	/**
  	 * Return a new expression from packed expression instructions in bytes.
  	 */
  	public static Expression fromBytes(byte[] bytes) {
  		return new Expression(bytes);
  	}
  
  	/**
  	 * Return a new expression from packed expression instructions in base64 encoded bytes.
  	 */
  	public static Expression fromBase64(byte[] bytes) {
  		return Expression.fromBytes(Crypto.decodeBase64(bytes, 0, bytes.length));
  	}
  
  	/**
  	 * Return a new expression from packed expression instructions in base64 encoded string.
  	 */
  	public static Expression fromBase64(String s) {
  		return Expression.fromBase64(s.getBytes());
  	}
  
  	/**
  	 * Return packed byte instructions.
  	 */
  	public byte[] getBytes() {
  		return bytes;
  	}
  
  	/**
  	 * Return byte instructions in base64 encoding.
  	 */
  	public String getBase64() {
  		return Crypto.encodeBase64(bytes);
  	}
  
  	/**
  	 * Estimate expression size in wire protocol.
  	 * For internal use only.
  	 */
  	public int size() {
  		return bytes.length + Command.FIELD_HEADER_SIZE;
  	}
  
  	/**
  	 * Write expression in wire protocol.
  	 * For internal use only.
  	 */
  	public void write(Command cmd) {
  		cmd.writeExpHeader(bytes.length);
  		System.arraycopy(bytes, 0, cmd.dataBuffer, cmd.dataOffset, bytes.length);
  		cmd.dataOffset += bytes.length;
  	}
  
  	@Override
  	public int hashCode() {
  		final int prime = 31;
  		int result = 1;
  		result = prime * result + Arrays.hashCode(bytes);
  		return result;
  	}
  
  	@Override
  	public boolean equals(Object obj) {
  		if (this == obj) {
  			return true;
  		}
  		if (obj == null) {
  			return false;
  		}
  		if (getClass() != obj.getClass()) {
  			return false;
  		}
  		Expression other = (Expression) obj;
  		return Arrays.equals(bytes, other.bytes);
  	}
  }
  