| /****************************************************************************** |
| * Copyright (c) 2016 Alex Blewitt and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Alex Blewitt - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.osgi.internal.loader.classpath; |
| |
| /** |
| * Stores a pair of {@link TitleVersionVendor} package attributes for the Implementation- and Specification- entries. |
| */ |
| class ManifestPackageAttributes { |
| /** |
| * Constant used when no titles, versions or vendors are specified for the package. |
| */ |
| static final ManifestPackageAttributes NONE = new ManifestPackageAttributes(TitleVersionVendor.NONE, TitleVersionVendor.NONE); |
| private final TitleVersionVendor implementation; |
| private final TitleVersionVendor specification; |
| |
| /** |
| * Utility method to return the first version, or the second if it is null |
| * @param first the string to return if not null |
| * @param second the fallback value if the first is null |
| * @return the first value, or the second value if the first is null |
| */ |
| private static String or(String first, String second) { |
| return first == null ? second : first; |
| } |
| |
| /** |
| * Factory method for creating ManifestPackageAttributes. If any of the given title, |
| * version, or vendor values are <code>null</code> then the defaultAttributes will be |
| * used. If the defaultAttributes is null or returns all <code>null</code> values then |
| * <code>null</code> values will be used. If <code>null</code> values are used for all of the |
| * versions, titles, and vendors then {@link #NONE} is returned. |
| * @param specificationTitle the package specification title |
| * @param specificationVersion the package specification version |
| * @param specificationVendor the package specification vendor |
| * @param implementationTitle the package implementation title |
| * @param implementationVersion the package implementation version |
| * @param implementationVendor the package implementation vendor |
| * @param defaultAttributes the default attributes to use when the specified title, version or vendor is <code>null</code>. |
| * @return |
| */ |
| static ManifestPackageAttributes of(String specificationTitle, String specificationVersion, String specificationVendor, String implementationTitle, String implementationVersion, String implementationVendor, ManifestPackageAttributes defaultAttributes) { |
| if (defaultAttributes == null) { |
| defaultAttributes = NONE; |
| } |
| return of(// |
| or(specificationTitle, defaultAttributes.getSpecification().getTitle()), // |
| or(specificationVersion, defaultAttributes.getSpecification().getVersion()), // |
| or(specificationVendor, defaultAttributes.getSpecification().getVendor()), // |
| or(implementationTitle, defaultAttributes.getImplementation().getTitle()), // |
| or(implementationVersion, defaultAttributes.getImplementation().getVersion()), // |
| or(implementationVendor, defaultAttributes.getImplementation().getVendor())// |
| ); |
| } |
| |
| private static ManifestPackageAttributes of(String specificationTitle, String specificationVersion, String specificationVendor, String implementationTitle, String implementationVersion, String implementationVendor) { |
| TitleVersionVendor specification = TitleVersionVendor.of(specificationTitle, specificationVersion, specificationVendor); |
| TitleVersionVendor implementation = TitleVersionVendor.of(implementationTitle, implementationVersion, implementationVendor); |
| if (specification == TitleVersionVendor.NONE && implementation == TitleVersionVendor.NONE) { |
| return NONE; |
| } |
| return new ManifestPackageAttributes(implementation, specification); |
| } |
| |
| private ManifestPackageAttributes(TitleVersionVendor implementation, TitleVersionVendor specification) { |
| if (implementation == null || specification == null) { |
| throw new IllegalArgumentException(); |
| } |
| this.implementation = implementation; |
| this.specification = specification; |
| } |
| |
| /** |
| * Returns the title, version and vendor for the package implementation. |
| * @return the title, version and vendor for the package implemetnation. |
| */ |
| TitleVersionVendor getImplementation() { |
| return implementation; |
| } |
| |
| /** |
| * Returns the title, version and vendor for the package specification. |
| * @return the title, version and vendor for the package specification. |
| */ |
| TitleVersionVendor getSpecification() { |
| return specification; |
| } |
| } |