/*
 * 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.facebook.presto.memory;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonValue;

import java.util.Objects;

import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;

public class MemoryPoolId
{
    private final String id;

    @JsonCreator
    public MemoryPoolId(String id)
    {
        requireNonNull(id, "id is null");
        checkArgument(!id.isEmpty(), "id is empty");
        this.id = id;
    }

    @JsonValue
    public String getId()
    {
        return id;
    }

    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        MemoryPoolId that = (MemoryPoolId) o;
        return Objects.equals(id, that.id);
    }

    @Override
    public int hashCode()
    {
        return Objects.hash(id);
    }

    @Override
    public String toString()
    {
        // Return id here, because Jackson uses toString() when MemoryPoolId is the key of a Map
        return id;
    }
}

@@ -846,16 +846,22 @@
 %0Apublic 
+final 
 class Me

Make MemoryPoolId final