com.google.gerrit.server.change.PutTopic.java Source code

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

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// Copyright (C) 2012 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.common.base.Strings;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.extensions.restapi.DefaultInput;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.RestModifyView;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.reviewdb.client.ChangeMessage;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.ChangeUtil;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.change.PutTopic.Input;
import com.google.gerrit.server.project.ChangeControl;
import com.google.gwtorm.server.AtomicUpdate;
import com.google.inject.Inject;
import com.google.inject.Provider;

import java.util.Collections;

class PutTopic implements RestModifyView<ChangeResource, Input> {
    private final Provider<ReviewDb> dbProvider;

    static class Input {
        @DefaultInput
        String topic;
        String message;
    }

    @Inject
    PutTopic(Provider<ReviewDb> dbProvider) {
        this.dbProvider = dbProvider;
    }

    @Override
    public Object apply(ChangeResource req, Input input)
            throws BadRequestException, AuthException, ResourceConflictException, Exception {
        if (input == null) {
            input = new Input();
        }

        ChangeControl control = req.getControl();
        Change change = req.getChange();
        if (!control.canEditTopicName()) {
            throw new AuthException("changing topic not permitted");
        }

        ReviewDb db = dbProvider.get();
        final String newTopicName = Strings.nullToEmpty(input.topic);
        String oldTopicName = Strings.nullToEmpty(change.getTopic());
        if (!oldTopicName.equals(newTopicName)) {
            String summary;
            if (oldTopicName.isEmpty()) {
                summary = "Topic set to \"" + newTopicName + "\".";
            } else if (newTopicName.isEmpty()) {
                summary = "Topic \"" + oldTopicName + "\" removed.";
            } else {
                summary = String.format("Topic updated from \"%s\" to \"%s\".", oldTopicName, newTopicName);
            }

            ChangeMessage cmsg = new ChangeMessage(
                    new ChangeMessage.Key(change.getId(), ChangeUtil.messageUUID(db)),
                    ((IdentifiedUser) control.getCurrentUser()).getAccountId(), change.currentPatchSetId());
            StringBuilder msgBuf = new StringBuilder(summary);
            if (!Strings.isNullOrEmpty(input.message)) {
                msgBuf.append("\n\n");
                msgBuf.append(input.message);
            }
            cmsg.setMessage(msgBuf.toString());

            db.changes().atomicUpdate(change.getId(), new AtomicUpdate<Change>() {
                @Override
                public Change update(Change change) {
                    change.setTopic(Strings.emptyToNull(newTopicName));
                    return change;
                }
            });
            db.changeMessages().insert(Collections.singleton(cmsg));
        }
        return Strings.isNullOrEmpty(newTopicName) ? Response.none() : newTopicName;
    }
}