com.oracle.tools.runtime.java.ClassPathModifier Maven / Gradle / Ivy

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package com.oracle.tools.runtime.java;

import com.oracle.tools.Option;

/**
 * An {@link Option} to define modifications that can be
 * applied to a Java class path String.
 *
 * @author jk 2015.01.15
 */
public class ClassPathModifier
    implements Option
{
    /**
     * Flag indicating whether the class path should be quoted
     */
    private boolean useQuotes = true;

    /**
     * Create an instance of {@link ClassPathModifier}
     *
     * @param useQuotes flag indicating whether the class
     *                  path should be quoted
     */
    public ClassPathModifier(boolean useQuotes)
    {
        this.useQuotes = useQuotes;
    }

    /**
     * Apply any required modifications to the original class path String.
     *
     * @param classPath  the class path String to modify
     *
     * @return the modified class path String.
     */
    public String modify(String classPath)
    {
        return classPath;
    }

    /**
     * Apply quotes to the specified class path if this
     * modifier has the {@link #useQuotes} flag set to true.
     *
     * @param classPath the class path to apply quotes to
     *
     * @return the quoted class path string
     */
    public String applyQuotes(String classPath)
    {
        if (useQuotes)
        {
            StringBuilder builder = new StringBuilder();

            if (!classPath.startsWith("\""))
            {
                builder.append('"');
            }

            builder.append(classPath);

            if (!classPath.endsWith("\""))
            {
                builder.append('"');
            }

            return builder.toString();
        }

        return classPath;
    }

    /**
     * Obtain a ClassPathModifier that performs no modification
     * on a class path String.
     *
     * @return a ClassPathModifier that performs no modification
     *         on a class path String
     */
    public static ClassPathModifier none()
    {
        return new ClassPathModifier(true);
    }

    /**
     * Obtain a ClassPathModifier that performs modifications
     * to the class path required by Cygwin platforms.
     *
     * @return a ClassPathModifier that performs modifications
     *         to the class path required by Cygwin platforms
     */
    public static ClassPathModifier forCygwin()
    {
        return new CygwinModifier(true);
    }

    /**
     * Obtain a ClassPathModifier that performs modifications
     * to the class path required by Cygwin platforms.
     *
     * @return a ClassPathModifier that performs modifications
     *         to the class path required by Cygwin platforms
     */
    public static ClassPathModifier forWindows()
    {
        return new WindowsModifier(false);
    }

    /**
     * Obtain a ClassPathModifier that performs modifications
     * to the class path required by Cygwin platforms.
     *
     * @return a ClassPathModifier that performs modifications
     *         to the class path required by Cygwin platforms
     */
    public static ClassPathModifier forWindowsWithQuotes()
    {
        return new WindowsModifier(true);
    }

    /**
     * An implementation of {@link ClassPathModifier} that
     * applies modifications for the Cygwin platform.
     */
    private static class CygwinModifier
        extends ClassPathModifier
    {
        public CygwinModifier(boolean useQuotes)
        {
            super(useQuotes);
        }

        @Override
        public String modify(String classPath)
        {
            return String.format("$(cygpath -wp %s)", classPath);
        }
    }

    /**
     * An implementation of {@link ClassPathModifier} that
     * applies modifications for the Windows platform.
     */
    private static class WindowsModifier
            extends ClassPathModifier
    {
        public WindowsModifier(boolean useQuotes)
        {
            super(useQuotes);
        }

        @Override
        public String modify(String classPath)
        {
            return classPath.replaceAll("/", "\\\\");
        }
    }
}