com.google.gerrit.server.ReviewerSet.java Source code

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Here is the source code for com.google.gerrit.server.ReviewerSet.java

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// Copyright (C) 2016 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;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.gerrit.server.notedb.ReviewerStateInternal.CC;
import static com.google.gerrit.server.notedb.ReviewerStateInternal.REVIEWER;

import com.google.common.collect.HashBasedTable;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableTable;
import com.google.common.collect.Table;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.reviewdb.client.PatchSetApproval;
import com.google.gerrit.server.notedb.ReviewerStateInternal;
import java.sql.Timestamp;

/**
 * Set of reviewers on a change.
 *
 * <p>A given account may appear in multiple states and at different timestamps. No reviewers with
 * state {@link ReviewerStateInternal#REMOVED} are ever exposed by this interface.
 */
public class ReviewerSet {
    private static final ReviewerSet EMPTY = new ReviewerSet(
            ImmutableTable.<ReviewerStateInternal, Account.Id, Timestamp>of());

    public static ReviewerSet fromApprovals(Iterable<PatchSetApproval> approvals) {
        PatchSetApproval first = null;
        Table<ReviewerStateInternal, Account.Id, Timestamp> reviewers = HashBasedTable.create();
        for (PatchSetApproval psa : approvals) {
            if (first == null) {
                first = psa;
            } else {
                checkArgument(
                        first.getKey().getParentKey().getParentKey()
                                .equals(psa.getKey().getParentKey().getParentKey()),
                        "multiple change IDs: %s, %s", first.getKey(), psa.getKey());
            }
            Account.Id id = psa.getAccountId();
            reviewers.put(REVIEWER, id, psa.getGranted());
            if (psa.getValue() != 0) {
                reviewers.remove(CC, id);
            }
        }
        return new ReviewerSet(reviewers);
    }

    public static ReviewerSet fromTable(Table<ReviewerStateInternal, Account.Id, Timestamp> table) {
        return new ReviewerSet(table);
    }

    public static ReviewerSet empty() {
        return EMPTY;
    }

    private final ImmutableTable<ReviewerStateInternal, Account.Id, Timestamp> table;
    private ImmutableSet<Account.Id> accounts;

    private ReviewerSet(Table<ReviewerStateInternal, Account.Id, Timestamp> table) {
        this.table = ImmutableTable.copyOf(table);
    }

    public ImmutableSet<Account.Id> all() {
        if (accounts == null) {
            // Idempotent and immutable, don't bother locking.
            accounts = ImmutableSet.copyOf(table.columnKeySet());
        }
        return accounts;
    }

    public ImmutableSet<Account.Id> byState(ReviewerStateInternal state) {
        return table.row(state).keySet();
    }

    public ImmutableTable<ReviewerStateInternal, Account.Id, Timestamp> asTable() {
        return table;
    }

    @Override
    public boolean equals(Object o) {
        return (o instanceof ReviewerSet) && table.equals(((ReviewerSet) o).table);
    }

    @Override
    public int hashCode() {
        return table.hashCode();
    }

    @Override
    public String toString() {
        return getClass().getSimpleName() + table;
    }
}