com.topekalabs.java.utils.ClassUtils.java Source code

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Here is the source code for com.topekalabs.java.utils.ClassUtils.java

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/*
 * Copyright 2014 Topeka Labs.
 *
 * 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 com.topekalabs.java.utils;

import com.topekalabs.error.utils.ExceptionUtils;
import com.topekalabs.file.utils.IOFileFilterRegexName;
import java.io.File;
import java.util.Collection;
import java.util.regex.Pattern;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.filefilter.TrueFileFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * @author Topeka Labs
 */
public class ClassUtils {
    private static final Logger logger = LoggerFactory.getLogger(ClassUtils.class.getName());

    public static final Pattern ANONYMOUS_CLASS_NAME_REGEX = Pattern.compile("\\d+");
    public static final String CLASS_FILE_SUFFIX = ".class";
    public static final String CLASS_FILE_SUFFIX_REGEX = "\\.class";

    private ClassUtils() {
        //Do Nothing
    }

    public static boolean isFQClassName(String className) {
        return JavaLangUtils.isConventionalPackageName(className);
    }

    public static boolean isClassName(String className) {
        return JavaLangUtils.isIdentifier(className);
    }

    public static boolean isAnyClassName(String className) {
        return isClassName(className) || isFQClassName(className);
    }

    public static String getFQClassNamePackage(String className) {
        notFQClassNameException(className);

        int index = className.lastIndexOf(JavaLangUtils.PACKAGE_DELIMETER);
        String packageName = className.substring(0, index);
        return packageName;
    }

    public static String getFQClassNameName(String className) {
        notFQClassNameException(className);

        int index = className.lastIndexOf(JavaLangUtils.PACKAGE_DELIMETER);
        index++;
        return className.substring(index);
    }

    public static File getFQClassFile(File srcDirectory, String className) {
        return new File(getFQClassPackageDirectory(srcDirectory, className),
                getFQClassNameName(className) + CLASS_FILE_SUFFIX);
    }

    public static File getFQClassPackageDirectory(File srcDirectory, String className) {
        ExceptionUtils.fileDoesNotExistException(srcDirectory);
        String packageName = getFQClassNamePackage(className);

        File file = new File(srcDirectory, JavaLangUtils.convertPackageNameToPath(packageName));
        ExceptionUtils.fileDoesNotExistException(file);

        return file;
    }

    public static Collection<File> getFQClassAndInnerClassFiles(File srcDirectory, String className) {
        notFQClassNameException(className);

        return FileUtils.listFiles(getFQClassPackageDirectory(srcDirectory, className),
                new IOFileFilterRegexName(getFQClassNameName(className) + ".*" + CLASS_FILE_SUFFIX_REGEX), null);
    }

    public static Collection<File> getClassFiles(File srcDirectory, String className) {
        notClassNameException(className);

        return FileUtils.listFiles(srcDirectory,
                new IOFileFilterRegexName(Pattern.quote(className + CLASS_FILE_SUFFIX)), TrueFileFilter.INSTANCE);
    }

    public static Collection<File> getClassAndInnerClassFiles(File srcDirectory, String className) {
        notClassNameException(className);

        return FileUtils.listFiles(srcDirectory,
                new IOFileFilterRegexName(Pattern.quote(className) + "(\\$.+)?" + CLASS_FILE_SUFFIX_REGEX),
                TrueFileFilter.INSTANCE);
    }

    public static void notClassNameException(String className) {
        ExceptionUtils.thisShouldNotHappen(!isClassName(className), "This is not a class name.");
    }

    public static void notFQClassNameException(String className) {
        ExceptionUtils.thisShouldNotHappen(!isFQClassName(className), "This is not a fully qualified class name.");
    }
}