flink-spector-master/flinkspector-core/src/main/java/io/flinkspector/core/quantify/assertions/UntilCombineMatcher.java
/*
 * Copyright 2015 Otto (GmbH & Co KG)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.flinkspector.core.quantify.assertions;

import com.google.common.collect.Iterables;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeDiagnosingMatcher;

import java.util.ArrayList;
import java.util.List;

public abstract class UntilCombineMatcher<T> extends TypeSafeDiagnosingMatcher<T> {

    private final Iterable<Matcher<? super T>> matchers;

    public UntilCombineMatcher(Iterable<Matcher<? super T>> matchers) {
        this.matchers = matchers;
    }

    @Override
    public boolean matchesSafely(T object, Description mismatch) {
        int matches = 0;
        int possibleMatches = Iterables.size(matchers);

        for (Matcher<? super T> matcher : matchers) {
            if (!matcher.matches(object)) {
                if (!mismatch.toString().endsWith("but: ")) {
                    mismatch.appendText("\n          ");
                }
                matcher.describeMismatch(object, mismatch);
            } else {
                matches++;
                if (validWhen(matches, possibleMatches)) {
                    return true;
                }
            }
        }
        return false;
    }

    @Override
    public void describeTo(Description description) {
        List<Matcher> matchers = new ArrayList<>();
        description.appendText(prefix());
        description.appendText(" ( ");
        for (Matcher m : this.matchers) {
            if (!description.toString().endsWith("( ")) {
                description.appendText("; ");
            }
            description.appendDescriptionOf(m);
        }
        description.appendText(") ");
    }

    public abstract String prefix();

    public abstract boolean validWhen(int matches, int possibleMatches);
}
