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/*
 * Copyright 2007-2009 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.artifacts.ivyservice.moduleconverter;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import org.gradle.api.artifacts.Configuration;
import org.gradle.api.capabilities.Capability;
import org.gradle.api.internal.artifacts.configurations.ConfigurationInternal;
import org.gradle.api.internal.artifacts.configurations.Configurations;
import org.gradle.api.internal.artifacts.configurations.OutgoingVariant;
import org.gradle.api.internal.artifacts.ivyservice.moduleconverter.dependencies.LocalConfigurationMetadataBuilder;
import org.gradle.internal.component.external.model.ImmutableCapabilities;
import org.gradle.internal.component.external.model.ImmutableCapability;
import org.gradle.internal.component.local.model.BuildableLocalComponentMetadata;
import org.gradle.internal.component.local.model.BuildableLocalConfigurationMetadata;

import java.util.Collection;

public class DefaultLocalComponentMetadataBuilder implements LocalComponentMetadataBuilder {
    private final LocalConfigurationMetadataBuilder configurationMetadataBuilder;

    public DefaultLocalComponentMetadataBuilder(LocalConfigurationMetadataBuilder configurationMetadataBuilder) {
        this.configurationMetadataBuilder = configurationMetadataBuilder;
    }

    public BuildableLocalConfigurationMetadata addConfiguration(BuildableLocalComponentMetadata metaData, ConfigurationInternal configuration) {
        BuildableLocalConfigurationMetadata configurationMetadata = createConfiguration(metaData, configuration);

        metaData.addDependenciesAndExcludesForConfiguration(configuration, configurationMetadataBuilder);

        OutgoingVariant outgoingVariant = configuration.convertToOutgoingVariant();
        metaData.addArtifacts(configuration.getName(), outgoingVariant.getArtifacts());
        for (OutgoingVariant variant : outgoingVariant.getChildren()) {
            metaData.addVariant(configuration.getName(), variant);
        }
        return configurationMetadata;
    }

    private BuildableLocalConfigurationMetadata createConfiguration(BuildableLocalComponentMetadata metaData,
                                                                    ConfigurationInternal configuration) {
        configuration.preventFromFurtherMutation();

        ImmutableSet hierarchy = Configurations.getNames(configuration.getHierarchy());
        ImmutableSet extendsFrom = Configurations.getNames(configuration.getExtendsFrom());
        // Presence of capabilities is bound to the definition of a capabilities extension to the project
        ImmutableCapabilities capabilities =
            asImmutable(Configurations.collectCapabilities(configuration, Sets.newHashSet(), Sets.newHashSet()));
        return metaData.addConfiguration(configuration.getName(),
            configuration.getDescription(),
            extendsFrom,
            hierarchy,
            configuration.isVisible(),
            configuration.isTransitive(),
            configuration.getAttributes().asImmutable(),
            configuration.isCanBeConsumed(),
            configuration.isCanBeResolved(),
            capabilities);
    }

    private static ImmutableCapabilities asImmutable(Collection descriptors) {
        if (descriptors.isEmpty()) {
            return ImmutableCapabilities.EMPTY;
        }
        ImmutableList.Builder builder = new ImmutableList.Builder();
        for (Capability descriptor : descriptors) {
            builder.add(new ImmutableCapability(descriptor.getGroup(), descriptor.getName(), descriptor.getVersion()));
        }
        return new ImmutableCapabilities(builder.build());
    }
}