com.google.gerrit.pgm.ProtoGen.java Source code

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Here is the source code for com.google.gerrit.pgm.ProtoGen.java

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// Copyright (C) 2010 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.pgm;

import com.google.gerrit.pgm.util.AbstractProgram;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gwtorm.schema.java.JavaSchemaModel;

import org.eclipse.jgit.internal.storage.file.LockFile;
import org.eclipse.jgit.util.FS;
import org.eclipse.jgit.util.IO;
import org.kohsuke.args4j.Option;

import java.io.BufferedWriter;
import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.nio.ByteBuffer;

public class ProtoGen extends AbstractProgram {
    @Option(name = "--output", aliases = {
            "-o" }, required = true, metaVar = "FILE", usage = "File to write .proto into")
    private File file;

    @Override
    public int run() throws Exception {
        LockFile lock = new LockFile(file.getAbsoluteFile(), FS.DETECTED);
        if (!lock.lock()) {
            throw die("Cannot lock " + file);
        }
        try {
            JavaSchemaModel jsm = new JavaSchemaModel(ReviewDb.class);
            try (OutputStream o = lock.getOutputStream();
                    PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(o, "UTF-8")))) {
                String header;
                try (InputStream in = getClass().getResourceAsStream("ProtoGenHeader.txt")) {
                    ByteBuffer buf = IO.readWholeStream(in, 1024);
                    int ptr = buf.arrayOffset() + buf.position();
                    int len = buf.remaining();
                    header = new String(buf.array(), ptr, len, "UTF-8");
                }

                String version = com.google.gerrit.common.Version.getVersion();
                out.write(header.replace("@@VERSION@@", version));
                jsm.generateProto(out);
                out.flush();
            }
            if (!lock.commit()) {
                throw die("Could not write to " + file);
            }
        } finally {
            lock.unlock();
        }
        System.out.println("Created " + file.getPath());
        return 0;
    }
}