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/*
 * Copyright 2017 the original author or authors.
 *
 * 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 org.gradle.api.internal.attributes;

import org.gradle.api.Action;
import org.gradle.api.attributes.Attribute;
import org.gradle.api.attributes.AttributeMatchingStrategy;
import org.gradle.internal.component.model.AttributeMatcher;

import java.util.Collections;
import java.util.Set;

public class EmptySchema implements AttributesSchemaInternal {
    public static final EmptySchema INSTANCE = new EmptySchema();

    private final DoNothingCompatibilityRule compatibilityRule = new DoNothingCompatibilityRule();
    private final DoNothingDisambiguationRule disambiguationRule = new DoNothingDisambiguationRule();

    protected EmptySchema() {
    }

    @Override
    public CompatibilityRule compatibilityRules(Attribute attribute) {
        return compatibilityRule;
    }

    @Override
    public DisambiguationRule disambiguationRules(Attribute attribute) {
        return disambiguationRule;
    }

    @Override
    public  AttributeMatchingStrategy getMatchingStrategy(Attribute attribute) {
        throw new UnsupportedOperationException();
    }

    @Override
    public AttributeMatcher matcher() {
        throw new UnsupportedOperationException();
    }

    @Override
    public AttributeMatcher withProducer(AttributesSchemaInternal producerSchema) {
        throw new UnsupportedOperationException();
    }

    @Override
    public  AttributeMatchingStrategy attribute(Attribute attribute) {
        throw new UnsupportedOperationException();
    }

    @Override
    public  AttributeMatchingStrategy attribute(Attribute attribute, Action> configureAction) {
        throw new UnsupportedOperationException();
    }

    @Override
    public Set> getAttributes() {
        return Collections.emptySet();
    }

    @Override
    public boolean hasAttribute(Attribute key) {
        throw new UnsupportedOperationException();
    }

    private static class DoNothingCompatibilityRule implements CompatibilityRule {
        @Override
        public void execute(CompatibilityCheckResult result) {
        }

        @Override
        public boolean doesSomething() {
            return false;
        }
    }

    private static class DoNothingDisambiguationRule implements DisambiguationRule {
        @Override
        public void execute(MultipleCandidatesResult objectMultipleCandidatesResult) {
        }

        @Override
        public boolean doesSomething() {
            return false;
        }
    }
}
 















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