/**
* 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.Protocol;
import org.apache.avro.idl.Idl;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.PrintStream;
import java.util.List;
/**
* Tool implementation for generating Avro JSON schemata from
* idl format files.
*/
public class IdlTool implements Tool {
@Override
public int run(InputStream in, PrintStream out, PrintStream err,
List<String> args) throws Exception {
PrintStream parseOut = out;
if (args.size() > 2 ||
(args.size() == 1 && (args.get(0).equals("--help") ||
args.get(0).equals("-help")))) {
err.println("Usage: idl [in] [out]");
err.println("");
err.println("If an output path is not specified, outputs to stdout.");
err.println("If no input or output is specified, takes input from");
err.println("stdin and outputs to stdin.");
err.println("The special path \"-\" may also be specified to refer to");
err.println("stdin and stdout.");
return -1;
}
Idl parser;
if (args.size() >= 1 && ! "-".equals(args.get(0))) {
parser = new Idl(new File(args.get(0)));
} else {
parser = new Idl(in);
}
if (args.size() == 2 && ! "-".equals(args.get(1))) {
parseOut = new PrintStream(new FileOutputStream(args.get(1)));
}
Protocol p = parser.CompilationUnit();
parseOut.print(p.toString(true));
return 0;
}
@Override
public String getName() {
return "idl";
}
@Override
public String getShortDescription() {
return "Generates a JSON schema from an Avro IDL file";
}
}