/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.avro.tool;
import org.apache.avro.Schema;
import org.apache.avro.compiler.idl.Idl;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.PrintStream;
import java.util.List;
/**
* Extract the Avro JSON schemata of the types of a protocol defined through an
* idl format file.
*/
public class IdlToSchemataTool implements Tool {
@Override
public int run(InputStream in, PrintStream out, PrintStream err,
List<String> args) throws Exception {
if (args.isEmpty() || args.size() > 2 || isRequestingHelp(args)) {
err.println("Usage: idl2schemata [idl] [outdir]");
err.println("");
err.println("If an output directory is not specified, "
+ "outputs to current directory.");
return -1;
}
boolean pretty = true;
Idl parser = new Idl(new File(args.get(0)));
File outputDirectory = getOutputDirectory(args);
for (Schema schema : parser.CompilationUnit().getTypes()) {
print(schema, outputDirectory, pretty);
}
parser.close();
return 0;
}
private boolean isRequestingHelp(List<String> args) {
return args.size() == 1
&& (args.get(0).equals("--help") || args.get(0).equals("-help"));
}
private File getOutputDirectory(List<String> args) {
String dirname = (args.size() == 2) ? args.get(1) : "";
File outputDirectory = new File(dirname);
outputDirectory.mkdirs();
return outputDirectory;
}
private void print(Schema schema, File outputDirectory, boolean pretty)
throws FileNotFoundException {
String dirpath = outputDirectory.getAbsolutePath();
String filename = dirpath + "/" + schema.getName() + ".avsc";
FileOutputStream fileOutputStream = new FileOutputStream(filename);
PrintStream printStream = new PrintStream(fileOutputStream);
printStream.println(schema.toString(pretty));
printStream.close();
}
@Override
public String getName() {
return "idl2schemata";
}
@Override
public String getShortDescription() {
return "Extract JSON schemata of the types from an Avro IDL file";
}
}