/*
 * Copyright 2007-2008 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.publication.maven.internal.pom;

import org.apache.maven.model.Exclusion;
import org.gradle.api.artifacts.ExcludeRule;

class DefaultExcludeRuleConverter implements ExcludeRuleConverter {
    @Override
    public Exclusion convert(ExcludeRule excludeRule) {
        if (isConvertible(excludeRule)) {
            Exclusion exclusion = new Exclusion();
            exclusion.setGroupId(determineExclusionExpression(excludeRule.getGroup()));
            exclusion.setArtifactId(determineExclusionExpression(excludeRule.getModule()));
            return exclusion;
        }
        return null;
    }

    private boolean isConvertible(ExcludeRule excludeRule) {
        return excludeRule.getGroup()!= null || excludeRule.getModule()!= null;
    }

    private String determineExclusionExpression(String attribute) {
        return attribute != null ? attribute : "*";
    }
}
