Modifiers.java

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package org.mule.devkit.model.code;

import java.io.PrintWriter;
import java.io.StringWriter;

/**
 * Modifier groups.
 */
public class Modifiers implements Generable {

    //
// mask
//
    private static int VAR = Modifier.FINAL;
    private static int FIELD = (Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED
            | Modifier.STATIC | Modifier.FINAL
            | Modifier.TRANSIENT | Modifier.VOLATILE);
    private static int METHOD = (Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED | Modifier.FINAL
            | Modifier.ABSTRACT | Modifier.STATIC | Modifier.NATIVE | Modifier.SYNCHRONIZED);
    private static int CLASS = (Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED
            | Modifier.STATIC | Modifier.FINAL | Modifier.ABSTRACT);
    private static int INTERFACE = Modifier.PUBLIC;
    /**
     * bit-packed representation of modifiers.
     */
    private int mods;

    private Modifiers(int mods) {
        this.mods = mods;
    }

    /**
     * Gets the bit-packed representaion of modifiers.
     */
    public int getValue() {
        return mods;
    }

    private static void check(int mods, int legal, String what) {
        if ((mods & ~legal) != 0) {
            throw new IllegalArgumentException("Illegal modifiers for "
                    + what + ": "
                    + new Modifiers(mods).toString());
        }
        /* ## check for illegal combinations too */
    }

    static Modifiers forVar(int mods) {
        check(mods, VAR, "variable");
        return new Modifiers(mods);
    }

    static Modifiers forField(int mods) {
        check(mods, FIELD, "field");
        return new Modifiers(mods);
    }

    static Modifiers forMethod(int mods) {
        check(mods, METHOD, "method");
        return new Modifiers(mods);
    }

    static Modifiers forClass(int mods) {
        check(mods, CLASS, "class");
        return new Modifiers(mods);
    }

    static Modifiers forInterface(int mods) {
        check(mods, INTERFACE, "class");
        return new Modifiers(mods);
    }

    public boolean isAbstract() {
        return (mods & Modifier.ABSTRACT) != 0;
    }

    public boolean isNative() {
        return (mods & Modifier.NATIVE) != 0;
    }

    public boolean isSynchronized() {
        return (mods & Modifier.SYNCHRONIZED) != 0;
    }

    public void setSynchronized(boolean newValue) {
        setFlag(Modifier.SYNCHRONIZED, newValue);
    }

    public void setPrivate() {
        setFlag(Modifier.PUBLIC, false);
        setFlag(Modifier.PROTECTED, false);
        setFlag(Modifier.PRIVATE, true);
    }

    public void setProtected() {
        setFlag(Modifier.PUBLIC, false);
        setFlag(Modifier.PROTECTED, true);
        setFlag(Modifier.PRIVATE, false);
    }

    public void setPublic() {
        setFlag(Modifier.PUBLIC, true);
        setFlag(Modifier.PROTECTED, false);
        setFlag(Modifier.PRIVATE, false);
    }

    public void setFinal(boolean newValue) {
        setFlag(Modifier.FINAL, newValue);
    }

    private void setFlag(int bit, boolean newValue) {
        mods = (mods & ~bit) | (newValue ? bit : 0);
    }

    public void generate(Formatter f) {
        if ((mods & Modifier.PUBLIC) != 0) {
            f.p("public");
        }
        if ((mods & Modifier.PROTECTED) != 0) {
            f.p("protected");
        }
        if ((mods & Modifier.PRIVATE) != 0) {
            f.p("private");
        }
        if ((mods & Modifier.FINAL) != 0) {
            f.p("final");
        }
        if ((mods & Modifier.STATIC) != 0) {
            f.p("static");
        }
        if ((mods & Modifier.ABSTRACT) != 0) {
            f.p("abstract");
        }
        if ((mods & Modifier.NATIVE) != 0) {
            f.p("native");
        }
        if ((mods & Modifier.SYNCHRONIZED) != 0) {
            f.p("synchronized");
        }
        if ((mods & Modifier.TRANSIENT) != 0) {
            f.p("transient");
        }
        if ((mods & Modifier.VOLATILE) != 0) {
            f.p("volatile");
        }
    }

    @Override
    public String toString() {
        StringWriter s = new StringWriter();
        Formatter f = new Formatter(new PrintWriter(s));
        this.generate(f);
        return s.toString();
    }
}