/*

* 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.lance;

import com.google.common.base.MoreObjects;

import com.google.common.base.Preconditions;

import java.util.Optional;

public class Ref {

private final Optional<Long> versionNumber;

private final Optional<String> branchName;

private final Optional<String> tagName;

public Ref(Optional<Long> versionNumber, Optional<String> branchName, Optional<String> tagName) {

this.versionNumber = versionNumber;

this.branchName = branchName;

this.tagName = tagName;

}

public Optional<Long> getVersionNumber() {

return versionNumber;

}

public Optional<String> getBranchName() {

return branchName;

}

public Optional<String> getTagName() {

return tagName;

}

public static Ref ofMain(long versionNumber) {

Preconditions.checkArgument(versionNumber > 0, "versionNumber must be greater than 0");

return new Ref(Optional.of(versionNumber), Optional.empty(), Optional.empty());

}

public static Ref ofMain() {

return new Ref(Optional.empty(), Optional.empty(), Optional.empty());

}

public static Ref ofBranch(String branchName) {

Preconditions.checkArgument(

branchName != null && !branchName.isEmpty(), "branchName must not be empty");

return new Ref(Optional.empty(), Optional.of(branchName), Optional.empty());

}

public static Ref ofBranch(String branchName, long versionNumber) {

Preconditions.checkArgument(

branchName != null && !branchName.isEmpty(), "branchName must not be empty");

Preconditions.checkArgument(versionNumber > 0, "versionNumber must be greater than 0");

return new Ref(Optional.of(versionNumber), Optional.of(branchName), Optional.empty());

}

public static Ref ofTag(String tagName) {

Preconditions.checkArgument(tagName != null && !tagName.isEmpty(), "tagName must not be empty");

return new Ref(Optional.empty(), Optional.empty(), Optional.of(tagName));

}

@Override

public String toString() {

return MoreObjects.toStringHelper(this)

.add("versionNumber", versionNumber.orElse(null))

.add("branchName", branchName.orElse(null))

.add("tagName", tagName.orElse(null))

.toString();

}

}