How to add a line in all java files in eclipse

Question

I am not sure if that is possible but I have a old java application projects which have 1000+ java files. I am trying to add log4j support to the application which require me to add

public static Logger logger = Logger.getLogger(MyClass.class.getName());

in every file.

Is there any way I can perform the operation using eclipse. I have tried source->format but that is not allowing me to add the line. Do I have to open every file and add that line?

Answer 1

You could make use of templates in eclipse, but in this case, you need to edit each file and add it.

Update :

Save following content in some file-named with extension ".xml"

<?xml version="1.0" encoding="UTF-8" standalone="no"?><templates><template autoinsert="true" context="java-members" deleted="false" description="adds the logger statement" enabled="true" name="logger">public static Logger logger = Logger.getLogger(${enclosing_type}.class.getName());</template></templates>

Press CTRL+3, Type - "templates" and choose for Templates- Java Editor as shown below

Import the file from menu from right as shown below

now go to any of your file and type "logger"in your class file and do CTRL+space , quick assist will show you the "logger" template as shown below

and your logging statement will appear, with your class in which you are editing as shown below

Answer 2

You can do it programatically. Start with a filter for all your .java:

public class FileExtensionFilter implements FilenameFilter {
    private Set<String> filteredExtensions;
    public FileExtensionFilter() {
        filteredExtensions = new HashSet<String>();
    }
    @Override
    public boolean accept(File dir, String name) {
        boolean accept = true;
        for (String filteredExtension:filteredExtensions) {
            accept = accept && !name.endsWith(filteredExtension);
        }
        return accept;
    }
    public void addFilteredExtension(String extension) {
        filteredExtensions.add(extension);
    }
}

Then you can look for the file using a recursive method:

public Set<String> searchFileBasedOnExtension(File file) {
    Set<String> extensions = new HashSet<String>();
    if (file.isDirectory()) {
        for (File f : file.listFiles(fileExtensionFilter)) {
            extensions.addAll(checkForExtensions(f));
        }
    } else {
        String extension = file.getName().substring(Math.max(file.getName().lastIndexOf('.'),0));
        extensions.add(extension);
        fileExtensionFilter.addFilteredExtension(extension);
    }
    return extensions;
}

Then based on the set you receive, you can iterate it, read the file to find the position to add the "import" and also find the class name, and save it into a variable to replace it for each file, since each file represents a different class.

Sample:

for (String s : setWithFileNames) {
 // Use BufferedReader to read the file, save the content in a String, then look inside the String the classname and the first import position.
 // Use bufferedWriter to re-write the file with the changes you made.
}

Hope it gives you a hand with your requirement. Best regards.