SqlDropPolicy.java

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package com.mapd.parser.extension.ddl;

import com.google.gson.annotations.Expose;

import org.apache.calcite.sql.SqlDrop;
import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.SqlOperator;
import org.apache.calcite.sql.SqlSpecialOperator;
import org.apache.calcite.sql.parser.SqlParserPos;
import org.apache.calcite.util.EscapedStringJsonBuilder;
import org.apache.calcite.util.JsonBuilder;

import java.util.List;
import java.util.Map;

public class SqlDropPolicy extends SqlDrop implements JsonSerializableDdl {
  private static final SqlOperator OPERATOR =
          new SqlSpecialOperator("DROP_POLICY", SqlKind.OTHER_DDL);

  @Expose
  private String command;
  @Expose
  private List<String> columnName;
  @Expose
  private SqlIdentifier granteeName;

  public SqlDropPolicy(final SqlParserPos pos,
          final List<String> columnName,
          final SqlIdentifier granteeName) {
    super(OPERATOR, pos, /*ifExists=*/false);
    this.command = OPERATOR.getName();
    this.columnName = columnName;
    this.granteeName = granteeName;
  }

  @Override
  public List<SqlNode> getOperandList() {
    return null;
  }

  @Override
  public String toString() {
    return toJsonString();
  }

  @Override
  public String toJsonString() {
    JsonBuilder jsonBuilder = new EscapedStringJsonBuilder();
    Map<String, Object> map = jsonBuilder.map();

    map.put("command", this.command);
    map.put("columnName", this.columnName);
    map.put("granteeName", this.granteeName.toString());

    Map<String, Object> payload = jsonBuilder.map();
    payload.put("payload", map);

    // To Debug:
    // System.out.println(jsonBuilder.toJsonString(payload))

    return jsonBuilder.toJsonString(payload);
  }
}