de.micromata.genome.gwiki.tools.PatchJavaHeader.java Source code

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Here is the source code for de.micromata.genome.gwiki.tools.PatchJavaHeader.java

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//
// Copyright (C) 2010-2016 Roger Rene Kommer & Micromata GmbH
//
// 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 de.micromata.genome.gwiki.tools;

import java.io.File;
import java.io.IOException;
import java.util.Collection;

import org.apache.commons.io.FileUtils;

import de.micromata.genome.util.runtime.RuntimeIOException;

public class PatchJavaHeader {
    public static String header = "////////////////////////////////////////////////////////////////////////////\n"
            + "//\n" + "// Copyright (C) 2010-2013 Micromata GmbH / Roger Rene Kommer\n" + "//\n"
            + "// Licensed under the Apache License, Version 2.0 (the \"License\");\n"
            + "// you may not use this file except in compliance with the License.\n"
            + "// You may obtain a copy of the License at\n" + "//\n"
            + "// http://www.apache.org/licenses/LICENSE-2.0\n" + "//\n"
            + "// Unless required by applicable law or agreed to in writing, software\n"
            + "// distributed under the License is distributed on an \"AS IS\" BASIS,\n"
            + "// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n"
            + "// See the License for the specific language governing permissions and\n"
            + "// limitations under the License.\n" + "//\n"
            + "////////////////////////////////////////////////////////////////////////////\n\n";

    public static byte[] headerBytes = header.getBytes();

    public static int skipLine(byte[] data, int offset) {
        for (int i = offset; i < data.length; ++i) {
            if (data[i] == '\n') {
                return i;
            }
        }
        throw new RuntimeException("No endline found");
    }

    public static int skipComments(byte[] data) {
        for (int i = 0; i < data.length; ++i) {
            if (data[i] == '/' && data[i + 1] == '/') {
                i = skipLine(data, i);
                continue;
            }
            return i;
        }
        return 0;
    }

    public static void patchFile(File file) {
        try {
            byte[] data = FileUtils.readFileToByteArray(file);
            int ofs = skipComments(data);
            byte[] newData = new byte[data.length - ofs + headerBytes.length];
            System.arraycopy(headerBytes, 0, newData, 0, headerBytes.length);
            System.arraycopy(data, ofs, newData, headerBytes.length, data.length - ofs);
            // String nf = new String(newData);
            // System.out.println("\n\n\n" + nf);
            FileUtils.writeByteArrayToFile(file, newData);
        } catch (IOException ex) {
            throw new RuntimeIOException(ex);
        }
    }

    public static void main(String[] args) {
        String baseDir = args[0];
        Collection<File> col = FileUtils.listFiles(new File(baseDir), new String[] { "java" }, true);
        for (File f : col) {
            System.out.println("file: " + f.getAbsolutePath());
            patchFile(f);
        }

    }
}