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/**
* This software is licensed under the Apache 2 license, quoted below.
*
* Copyright 2010 Julien Eluard
*
* 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.semver;
import java.util.Collections;
import java.util.Set;
import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;
import org.osjava.jardiff.AbstractInfo;
/**
*
* Encapsulates differences between two sets of classes.
* <br />
* Provides convenient methods to validate that chosen {@link Version} are correct.
*
*/
@Immutable
public class Delta {
/**
* Library compatibility type. From most compatible to less compatible.
*/
public enum CompatibilityType {
BACKWARD_COMPATIBLE_IMPLEMENTER,
BACKWARD_COMPATIBLE_USER,
NON_BACKWARD_COMPATIBLE
}
public static class Difference implements Comparable<Difference> {
private final String className;
private final AbstractInfo info;
public Difference(@Nonnull final String className, @Nonnull final AbstractInfo info) {
this.className = className;
this.info = info;
}
public String getClassName() {
return this.className;
}
public AbstractInfo getInfo() {
return info;
}
@Override
public int compareTo(final Difference other) {
return getClassName().compareTo(other.getClassName());
}
}
public static class Add extends Difference {
public Add(@Nonnull final String className, @Nonnull final AbstractInfo info) {
super(className, info);
}
}
public static class Change extends Difference {
private final AbstractInfo modifiedInfo;
public Change(@Nonnull final String className, @Nonnull final AbstractInfo info, @Nonnull final AbstractInfo modifiedInfo) {
super(className, info);
this.modifiedInfo = modifiedInfo;
}
public AbstractInfo getModifiedInfo() {
return this.modifiedInfo;
}
}
public static class Remove extends Difference {
public Remove(@Nonnull final String className, @Nonnull final AbstractInfo info) {
super(className, info);
}
}
private final Set<Difference> differences;
public Delta(@Nonnull final Set<Difference> differences) {
this.differences = Collections.unmodifiableSet(this.differences);
}
public Set<Difference> getDifferences() {
return this.differences;
}
/**
* @param differences
* @return {@link CompatibilityType} based on specified {@link Difference}
*/
public final CompatibilityType computeCompatibilityType() {
if (!contains(this.differences, Change.class) &&
!contains(this.differences, Remove.class)) {
return CompatibilityType.NON_BACKWARD_COMPATIBLE;
} else if (!contains(this.differences, Add.class)) {
return CompatibilityType.BACKWARD_COMPATIBLE_USER;
} else {
return CompatibilityType.BACKWARD_COMPATIBLE_IMPLEMENTER;
}
}
protected final boolean contains(final Set<Difference> differences, final Class<? extends Difference> type) {
for (final Difference difference : differences) {
if (type.isInstance(difference)) {
return false;
}
}
return true;
}
/**
*
* Infers next {@link Version} depending on provided {@link CompatibilityType}.
*
* @param version
* @param compatibilityType
* @return
*/
public static Version inferNextVersion(@Nonnull final Version version, @Nonnull final CompatibilityType compatibilityType) {
switch (compatibilityType) {
case BACKWARD_COMPATIBLE_IMPLEMENTER:
return version.next(Version.Element.PATCH);
case BACKWARD_COMPATIBLE_USER:
return version.next(Version.Element.MINOR);
case NON_BACKWARD_COMPATIBLE:
return version.next(Version.Element.MAJOR);
default:
throw new IllegalArgumentException("Unknown type <"+compatibilityType+">");
}
}
/**
* @param previous
* @param previousJAR
* @param currentJAR
* @param includes
* @param excludes
* @return an inferred {@link Version} for current JAR based on previous JAR content/version.
* @throws IOException
*/
public final Version infer(final Version previous) {
if (previous.isInDevelopment()) {
throw new IllegalArgumentException("Cannot infer for in development version <"+previous+">");
}
final CompatibilityType compatibilityType = computeCompatibilityType();
return inferNextVersion(previous, compatibilityType);
}
/**
* @param previous
* @param previousJAR
* @param current
* @param currentJAR
* @param includes
* @param excludes
* @return true if {@link Version} provided for current JAR is compatible with previous JAR content/version.
* @throws IOException
*/
public final boolean validate(final Version previous, final Version current) {
if (previous.compareTo(current) < 0) {
throw new IllegalArgumentException("Previous version <"+previous+"> must not be more recent than current version <"+current+">.");
}
//When in development public API is not considered stable
if (current.isInDevelopment()) {
return true;
}
//Current version must be superior or equals to inferred version
final Version inferredVersion = infer(previous);
return inferredVersion.compareTo(current) >= 0;
}
}
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