MapType.java

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package com.cloudera.impala.catalog;

import com.cloudera.impala.thrift.TColumnType;
import com.cloudera.impala.thrift.TTypeNode;
import com.cloudera.impala.thrift.TTypeNodeType;
import com.google.common.base.Preconditions;

public class MapType extends Type {
  private final Type keyType_;
  private final Type valueType_;

  public MapType(Type keyType, Type valueType) {
    Preconditions.checkNotNull(keyType);
    Preconditions.checkNotNull(valueType);
    keyType_ = keyType;
    valueType_ = valueType;
  }

  public Type getKeyType() { return keyType_; }
  public Type getValueType() { return valueType_; }

  @Override
  public String toSql() {
    return String.format("MAP<%s,%s>", keyType_.toSql(), valueType_.toSql());
  }

  @Override
  public void toThrift(TColumnType container) {
    TTypeNode node = new TTypeNode();
    container.types.add(node);
    Preconditions.checkNotNull(keyType_);
    Preconditions.checkNotNull(valueType_);
    node.setType(TTypeNodeType.MAP);
    keyType_.toThrift(container);
    valueType_.toThrift(container);
  }
}