Compare the modifier of two elements - Java Reflection

Java examples for Reflection:Modifier

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Description

Compare the modifier of two elements

Demo Code


//package com.java2s;
import java.util.Set;
import javax.lang.model.element.Element;
import javax.lang.model.element.Modifier;

public class Main {
    /**//  ww  w.  j a v a2s.  c  om
     * Compare the modifier of two elements
     *
     * @return -1 if element a has better visibility, 0 if both have the same visibility, +1 if b has
     * the better visibility. The "best" visibility is PUBLIC
     */
    public static int compareModifierVisibility(Element a, Element b) {

        // a better
        if (a.getModifiers().contains(Modifier.PUBLIC)
                && !b.getModifiers().contains(Modifier.PUBLIC)) {
            return -1;
        }

        if (isDefaultModifier(a.getModifiers())
                && !isDefaultModifier(b.getModifiers())) {
            return -1;
        }

        if (a.getModifiers().contains(Modifier.PROTECTED)
                && !b.getModifiers().contains(Modifier.PROTECTED)) {
            return -1;
        }

        // b better
        if (b.getModifiers().contains(Modifier.PUBLIC)
                && !a.getModifiers().contains(Modifier.PUBLIC)) {
            return 1;
        }

        if (isDefaultModifier(b.getModifiers())
                && !isDefaultModifier(a.getModifiers())) {
            return 1;
        }

        if (b.getModifiers().contains(Modifier.PROTECTED)
                && !a.getModifiers().contains(Modifier.PROTECTED)) {
            return 1;
        }

        // Same
        return 0;
    }

    /**
     * @param modifiers Set of modifiers
     * @return true if this element has default visibility
     */
    public static boolean isDefaultModifier(Set<Modifier> modifiers) {
        return !modifiers.contains(Modifier.PUBLIC)
                && !modifiers.contains(Modifier.PROTECTED)
                && !modifiers.contains(Modifier.PRIVATE);
    }
}

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