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package com.fitbur.bytebuddy.matcher;

import com.fitbur.bytebuddy.description.ByteCodeElement;
import com.fitbur.bytebuddy.description.type.TypeDescription;

/**
 * An element matcher that validates that a given byte code element is visible to a given type.
 *
 * @param The type of the matched entity.
 */
public class VisibilityMatcher extends ElementMatcher.Junction.AbstractBase {

    /**
     * The type that is to be checked for its viewing rights.
     */
    private final TypeDescription typeDescription;

    /**
     * Creates a matcher that validates that a byte code element can be seen by a given type.
     *
     * @param typeDescription The type that is to be checked for its viewing rights.
     */
    public VisibilityMatcher(TypeDescription typeDescription) {
        this.typeDescription = typeDescription;
    }

    @Override
    public boolean matches(T target) {
        return target.isVisibleTo(typeDescription);
    }

    @Override
    public boolean equals(Object other) {
        return this == other || !(other == null || getClass() != other.getClass())
                && typeDescription.equals(((VisibilityMatcher) other).typeDescription);
    }

    @Override
    public int hashCode() {
        return typeDescription.hashCode();
    }

    @Override
    public String toString() {
        return "isVisibleTo(" + typeDescription + ")";
    }
}