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// Copyright 2008 Google Inc.
//
// 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.google.gerrit.index.query;

import static java.util.Objects.requireNonNull;

import com.google.common.collect.ImmutableList;
import java.util.Iterator;
import java.util.List;

/**
 * Result set for queries that run synchronously or for cases where the result is already known and
 * we just need to pipe it back through our interfaces.
 *
 * 

If your implementation benefits from asynchronous execution (i.e. dispatching a query and * awaiting results only when {@link ResultSet#toList()} is called, consider using {@link * LazyResultSet}. */ public class ListResultSet implements ResultSet { private ImmutableList results; public ListResultSet(List r) { results = ImmutableList.copyOf(requireNonNull(r, "results can't be null")); } @Override public Iterator iterator() { return toList().iterator(); } @Override public ImmutableList toList() { if (results == null) { throw new IllegalStateException("Results already obtained"); } ImmutableList r = results; results = null; return r; } @Override public void close() { results = null; } @Override public Object searchAfter() { return null; } }





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