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package com.fitbur.bytebuddy.matcher;

/**
 * A fail-safe matcher catches exceptions that are thrown by a delegate matcher and returns an alternative value.
 *
 * @param  The type of the matched entity.
 */
public class FailSafeMatcher extends ElementMatcher.Junction.AbstractBase {

    /**
     * The delegate matcher that might throw an exception.
     */
    private final ElementMatcher delegate;

    /**
     * The fallback value in case of an exception.
     */
    private final boolean fallback;

    /**
     * Creates a new fail-safe element matcher.
     *
     * @param delegate The delegate matcher that might throw an exception.
     * @param fallback The fallback value in case of an exception.
     */
    public FailSafeMatcher(ElementMatcher delegate, boolean fallback) {
        this.delegate = delegate;
        this.fallback = fallback;
    }

    @Override
    public boolean matches(T target) {
        try {
            return delegate.matches(target);
        } catch (Exception ignored) {
            return fallback;
        }
    }

    @Override
    public boolean equals(Object other) {
        if (this == other) return true;
        if (other == null || getClass() != other.getClass()) return false;
        FailSafeMatcher that = (FailSafeMatcher) other;
        return fallback == that.fallback && delegate.equals(that.delegate);
    }

    @Override
    public int hashCode() {
        int result = delegate.hashCode();
        result = 31 * result + (fallback ? 1 : 0);
        return result;
    }

    @Override
    public String toString() {
        return "failSafe(try(" + delegate + ") or " + fallback + ")";
    }
}