com.googlecode.japi.checker.Utils.java Source code

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Here is the source code for com.googlecode.japi.checker.Utils.java

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/*
 * Copyright 2011 William Bernardet
 *
 * 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.googlecode.japi.checker;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.zip.ZipFile;

import org.objectweb.asm.Opcodes;

import com.googlecode.japi.checker.model.Scope;

public final class Utils {

    private Utils() {
    }

    public static String fixNull(String str) {
        if (str == null) {
            return "";
        }
        return str;
    }

    public static String fixEmpty(String str) {
        if (str == null || "".equals(str)) {
            return null;
        }
        return str;
    }

    public static String toDottedClassName(final String name) {
        if (name == null) {
            return null;
        }
        return name.replaceAll("/", ".");
    }

    public static String[] toDottedClassNames(String[] names) {
        if (names == null) {
            return null;
        }
        String[] ret = new String[names.length];
        for (int i = 0; i < names.length; i++) {
            ret[i] = toDottedClassName(names[i]);
        }
        return ret;
    }

    public static String toSlashedClassName(final String name) {
        if (name == null) {
            return null;
        }
        return name.replaceAll("[.]", "/");
    }

    /**
     * Joins the elements of the provided <code>Iterable</code> into a single String containing the provided elements.
     * @param s
     * @param separator
     * @return the String containing provided elements
     */
    public static String join(Iterable<?> iterable, String separator) {
        StringBuffer buffer = new StringBuffer();
        Iterator<?> iterator = iterable.iterator();
        while (iterator.hasNext()) {
            buffer.append(iterator.next());
            if (iterator.hasNext()) {
                buffer.append(separator);
            }
        }
        return buffer.toString();
    }

    public static boolean isArchive(File file) {
        ZipFile zf = null;
        try {
            zf = new ZipFile(file);
            zf.entries(); // forcing to do something with the file.
            return true;
        } catch (IOException e) {
            return false;
        } finally {
            if (zf != null) {
                try {
                    zf.close();
                } catch (IOException e) {
                    // swallow the exception...
                }
            }
        }
    }

    public static Scope toScope(int access) {
        if ((access & Opcodes.ACC_PRIVATE) == Opcodes.ACC_PRIVATE) {
            return Scope.PRIVATE;
        } else if ((access & Opcodes.ACC_PROTECTED) == Opcodes.ACC_PROTECTED) {
            return Scope.PROTECTED;
        }
        if ((access & Opcodes.ACC_PUBLIC) == Opcodes.ACC_PUBLIC) {
            return Scope.PUBLIC;
        } else {
            return Scope.PACKAGE;
        }
    }
}