Convert all java system.out.print to SLF4J

convert-java-system-out-to-slf4j.py

"""
Copyright 2015 Guoliang Li
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.
"""

import os


def convert_sout_to_slf4j(java_src_file):
    with open(java_src_file) as f:
        lines = f.readlines()
        import_missing = True
        last_import_index = 1

        for i, l in enumerate(lines):

            if import_missing and l.startswith("import "):
                last_import_index = i

            if import_missing and "class " in l:
                import_missing = False
                lines.insert(last_import_index + 1, "import org.slf4j.Logger;\n")
                lines.insert(last_import_index + 2, "import org.slf4j.LoggerFactory;\n")

                lines.insert(i + 3, "    Logger logger = LoggerFactory.getLogger(getClass());")

            if "System.out.println(" in l:
                ll = l.replace("System.out.println(", "log.info(")
                del lines[i]
                lines.insert(i, ll)

        for l in lines:
            print l.strip('\n')


java_src_root = "/projects/java-playground/db/src/main/java/"

for root, dirs, files in os.walk(java_src_root):
    for f in files:
        if f.endswith(".java"):
            java_src_file = os.path.join(root, f)
            convert_sout_to_slf4j(java_src_file)