run.halo.app.extension.router.selector.EqualityMatcher Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of api Show documentation

API of halo project, connecting by other projects.

The newest version!

package run.halo.app.extension.router.selector;

import java.util.function.Function;
import java.util.function.Predicate;

public class EqualityMatcher implements SelectorMatcher {
    private final Operator operator;
    private final String key;
    private final String value;

    EqualityMatcher(String key, Operator operator, String value) {
        this.key = key;
        this.operator = operator;
        this.value = value;
    }

    /**
     * The "equal" matcher. Matches a label if the label is present and equal.
     *
     * @param key the matching label key
     * @param value the matching label value
     * @return the equality matcher
     */
    public static EqualityMatcher equal(String key, String value) {
        return new EqualityMatcher(key, Operator.EQUAL, value);
    }

    /**
     * The "not equal" matcher. Matches a label if the label is not present or not equal.
     *
     * @param key the matching label key
     * @param value the matching label value
     * @return the equality matcher
     */
    public static EqualityMatcher notEqual(String key, String value) {
        return new EqualityMatcher(key, Operator.NOT_EQUAL, value);
    }

    @Override
    public String toString() {
        return key
            + " "
            + operator.name().toLowerCase()
            + " "
            + value;
    }

    @Override
    public boolean test(String s) {
        return operator.with(value).test(s);
    }

    @Override
    public String getKey() {
        return key;
    }

    protected enum Operator {
        EQUAL(arg -> arg::equals),
        DOUBLE_EQUAL(arg -> arg::equals),
        NOT_EQUAL(arg -> v -> !arg.equals(v));

        private final Function> matcherFunc;

        Operator(Function> matcherFunc) {
            this.matcherFunc = matcherFunc;
        }

        Predicate with(String value) {
            return matcherFunc.apply(value);
        }
    }
}