| /******************************************************************************* |
| * Copyright (c) 2007, 2008 IBM Corporation and others. All rights reserved. This |
| * program and the accompanying materials are made available under the terms of |
| * the Eclipse Public License v1.0 which accompanies this distribution, and is |
| * available at http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: IBM Corporation - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.equinox.internal.provisional.p2.metadata; |
| |
| import org.eclipse.osgi.service.resolver.VersionRange; |
| import org.osgi.framework.Version; |
| |
| public class RequirementChange { |
| private RequiredCapability applyOn; |
| private RequiredCapability newValue; |
| |
| public RequirementChange(RequiredCapability applyOn2, RequiredCapability newValue2) { |
| if (applyOn2 == null && newValue2 == null) |
| throw new IllegalArgumentException(); |
| this.applyOn = applyOn2; |
| this.newValue = newValue2; |
| } |
| |
| public RequiredCapability applyOn() { |
| return applyOn; |
| } |
| |
| public RequiredCapability newValue() { |
| return newValue; |
| } |
| |
| public boolean matches(RequiredCapability toMatch) { |
| if (!toMatch.getNamespace().equals(applyOn.getNamespace())) |
| return false; |
| if (!toMatch.getName().equals(applyOn.getName())) |
| return false; |
| if (toMatch.getRange().equals(applyOn.getRange())) |
| return true; |
| |
| return intersect(toMatch.getRange(), applyOn.getRange()) == null ? false : true; |
| } |
| |
| boolean matches(RequirementChange toMatch) { |
| return matches(toMatch.applyOn()); |
| } |
| |
| protected RequirementChange merge(RequirementChange r2) { |
| VersionRange result = intersect(newValue().getRange(), r2.newValue().getRange()); |
| if (result == null) |
| return null; |
| return new RequirementChange(applyOn, MetadataFactory.createRequiredCapability(applyOn.getNamespace(), applyOn.getName(), result, null, false, false)); |
| } |
| |
| private VersionRange intersect(VersionRange r1, VersionRange r2) { |
| Version resultMin = null; |
| boolean resultMinIncluded = false; |
| Version resultMax = null; |
| boolean resultMaxIncluded = false; |
| |
| int minCompare = r1.getMinimum().compareTo(r2.getMinimum()); |
| if (minCompare < 0) { |
| resultMin = r2.getMinimum(); |
| resultMinIncluded = r2.getIncludeMinimum(); |
| } else if (minCompare > 0) { |
| resultMin = r1.getMinimum(); |
| resultMinIncluded = r1.getIncludeMinimum(); |
| } else if (minCompare == 0) { |
| resultMin = r1.getMinimum(); |
| resultMinIncluded = r1.getIncludeMinimum() && r2.getIncludeMinimum(); |
| } |
| |
| int maxCompare = r1.getMaximum().compareTo(r2.getMaximum()); |
| if (maxCompare > 0) { |
| resultMax = r2.getMaximum(); |
| resultMaxIncluded = r2.getIncludeMaximum(); |
| } else if (maxCompare < 0) { |
| resultMax = r1.getMaximum(); |
| resultMaxIncluded = r1.getIncludeMaximum(); |
| } else if (maxCompare == 0) { |
| resultMax = r1.getMaximum(); |
| resultMaxIncluded = r1.getIncludeMaximum() && r2.getIncludeMaximum(); |
| } |
| |
| int resultRangeComparison = resultMin.compareTo(resultMax); |
| if (resultRangeComparison < 0) |
| return new VersionRange(resultMin, resultMinIncluded, resultMax, resultMaxIncluded); |
| else if (resultRangeComparison == 0 && resultMinIncluded == resultMaxIncluded) |
| return new VersionRange(resultMin, resultMinIncluded, resultMax, resultMaxIncluded); |
| else |
| return null; |
| } |
| |
| public boolean isCompatible(RequirementChange other) { |
| return intersect(newValue.getRange(), other.newValue.getRange()) != null; |
| } |
| |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + ((applyOn == null) ? 0 : applyOn.hashCode()); |
| result = prime * result + ((newValue == null) ? 0 : newValue.hashCode()); |
| return result; |
| } |
| |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| final RequirementChange other = (RequirementChange) obj; |
| if (applyOn == null) { |
| if (other.applyOn != null) |
| return false; |
| } else if (!applyOn.equals(other.applyOn)) |
| return false; |
| if (newValue == null) { |
| if (other.newValue != null) |
| return false; |
| } else if (!newValue.equals(other.newValue)) |
| return false; |
| return true; |
| } |
| } |