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// Copyright (C) 2020 The Android Open Source Project
//
// 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.server.change;

import com.google.auto.value.AutoValue;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Streams;
import com.google.gerrit.entities.Comment;
import com.google.gerrit.entities.HumanComment;
import java.util.List;
import java.util.Optional;

/**
 * Representation of a comment thread.
 *
 * 

A comment thread consists of at least one comment. * * @param type of comments in the thread. Can also be {@link Comment} if the thread mixes * comments of different types. */ @AutoValue public abstract class CommentThread { /** Comments in the thread in exactly the order they appear in the thread. */ public abstract ImmutableList comments(); /** Whether the whole thread is considered as unresolved. */ public boolean unresolved() { Optional lastHumanComment = Streams.findLast( comments().stream() .filter(HumanComment.class::isInstance) .map(HumanComment.class::cast)); // We often use false == null for boolean fields. It's also a safe fall-back if no human comment // is part of the thread. return lastHumanComment.map(comment -> comment.unresolved).orElse(false); } public static Builder builder() { return new AutoValue_CommentThread.Builder<>(); } @AutoValue.Builder public abstract static class Builder { public abstract Builder comments(List value); public Builder addComment(T comment) { commentsBuilder().add(comment); return this; } abstract ImmutableList.Builder commentsBuilder(); abstract ImmutableList comments(); abstract CommentThread autoBuild(); public CommentThread build() { Preconditions.checkState( !comments().isEmpty(), "A comment thread must contain at least one comment."); return autoBuild(); } } }





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