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 *
 * 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
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package org.openoffice.netbeans.modules.office.utils;

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;

import org.openoffice.idesupport.zip.ParcelZipper;

public class PackageRemover {
    private PackageRemover() {
    }

    public static void removeDeclaration(File source) throws IOException {
        File tmp = new File(source.getAbsolutePath() + ".tmp");

        BufferedReader in = new BufferedReader(new FileReader(source));
        BufferedWriter out = new BufferedWriter(new FileWriter(tmp));

        try {
            String line;
            while ((line = in.readLine()) != null) {
                if (line.startsWith("package")) {
                    String newDeclaration = evaluate(line);
                    if (newDeclaration != null) {
                        out.write(newDeclaration, 0, newDeclaration.length());
                        out.newLine();
                    }
                }
                else {
                    out.write(line, 0, line.length());
                    out.newLine();
                }
            }
        }
        finally {
            if (in != null) {
                in.close();
            }
            if (out != null) {
                out.close();
            }
        }

        if (source.delete() == false) {
            tmp.delete();
            throw new IOException("Could not overwrite " + source);
        }
        else {
            tmp.renameTo(source);
        }
    }

    public static String evaluate(String line) {

        int idx = line.indexOf(ParcelZipper.CONTENTS_DIRNAME);
        if (idx == -1)
            return line;

        idx = idx + ParcelZipper.CONTENTS_DIRNAME.length();
        if (line.charAt(idx) == '.')
            return "package " + line.substring(idx + 1);

        return null;
    }

    public static void main(String[] args) {
        File source = new File(args[0]);

        try {
            removeDeclaration(source);
        }
        catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
}