bundles/org.eclipse.equinox.p2.metadata/src/org/eclipse/equinox/internal/p2/metadata/VersionVector.java - equinox/rt.equinox.p2 - Git at Google

 /*******************************************************************************
  * Copyright (c) 2009, 2017 Cloudsmith Inc. 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:
  *     Cloudsmith Inc. - initial API and implementation
  *******************************************************************************/
 package org.eclipse.equinox.internal.p2.metadata;

 import java.io.Serializable;

 /**
  * The VersionVector represents an array of Comparable objects. The array can be
  * nested since a VersionVector is Comparable in itself.
  *
  * @Immutable
  */
 public class VersionVector implements Comparable<VersionVector>, Serializable {

 	interface MinMaxComparable extends Comparable<Object>, Serializable {
 		//
 	}

 	private static final class MaxStringValue implements MinMaxComparable {
 		private static final long serialVersionUID = -4936252230441132767L;

 		MaxStringValue() {
 			// Empty constructor
 		}

 		@Override
 		public int compareTo(Object o) {
 			return o == this ? 0 : (o == MAX_VALUE || o instanceof Integer || o instanceof EnumDefinition.EnumSegment || o instanceof VersionVector ? -1 : 1);
 		}

 		// For singleton deserialization
 		private Object readResolve() {
 			return MAXS_VALUE;
 		}

 		@Override
 		public String toString() {
 			return "m"; //$NON-NLS-1$
 		}
 	}

 	private static final class MaxValue implements MinMaxComparable {
 		private static final long serialVersionUID = -5889641741635253589L;

 		MaxValue() {
 			// Empty constructor
 		}

 		@Override
 		public int compareTo(Object o) {
 			return o == this ? 0 : 1;
 		}

 		// For singleton deserialization
 		private Object readResolve() {
 			return MAX_VALUE;
 		}

 		@Override
 		public String toString() {
 			return "M"; //$NON-NLS-1$
 		}
 	}

 	private static class MinValue implements MinMaxComparable {
 		private static final long serialVersionUID = -1066323980049812226L;

 		MinValue() {
 			// Empty constructor
 		}

 		@Override
 		public int compareTo(Object o) {
 			return o == this ? 0 : -1;
 		}

 		private Object readResolve() {
 			return MIN_VALUE;
 		}

 		@Override
 		public String toString() {
 			return "-M"; //$NON-NLS-1$
 		}
 	}

 	/**
 	 * A value that is greater then any other value
 	 */
 	public static final Comparable<Object> MAX_VALUE = new MaxValue();

 	/**
 	 * A value that is greater then any string but less then {@link #MAX_VALUE} and
 	 * any Integer or VersionVector.
 	 */
 	public static final Comparable<Object> MAXS_VALUE = new MaxStringValue();

 	/**
 	 * A value that is less then any other value
 	 */
 	public static final Comparable<Object> MIN_VALUE = new MinValue();

 	/**
 	 * A value that is greater then {@link #MIN_VALUE} and less then any string,
 	 * Integer, or VersionVector (a.k.a. empty_string)
 	 */
 	public static final String MINS_VALUE = ""; //$NON-NLS-1$

 	private static final long serialVersionUID = -8385373304298723744L;

 	static int compare(Comparable<?>[] vectorA, Comparable<?> padA, Comparable<?>[] vectorB, Comparable<?> padB) {
 		int top = vectorA.length;
 		if (top > vectorB.length)
 			top = vectorB.length;

 		for (int idx = 0; idx < top; ++idx) {
 			int cmp = compareSegments(vectorA[idx], vectorB[idx]);
 			if (cmp != 0)
 				return cmp;
 		}

 		// All elements compared equal up to this point. Check
 		// pad values
 		if (top < vectorA.length)
 			return (padB == null) ? 1 : compareReminder(top, vectorA, padA, padB);

 		if (top < vectorB.length)
 			return (padA == null) ? -1 : -compareReminder(top, vectorB, padB, padA);

 		// Lengths are equal. Compare pad values
 		return padA == null ? (padB == null ? 0 : -1) : (padB == null ? 1 : compareSegments(padA, padB));
 	}

 	static boolean equals(Comparable<?>[] vectorA, Comparable<?> padValueA, Comparable<?>[] vectorB, Comparable<?> padValueB) {
 		// We compare pad first since it is impossible for versions with
 		// different pad to be equal (versions are padded to infinity)
 		if (padValueA == null) {
 			if (padValueB != null)
 				return false;
 		} else {
 			if (padValueB == null || !padValueA.equals(padValueB))
 				return false;
 		}

 		int idx = vectorA.length;

 		// If the length of the vector differs, the versions cannot be equal
 		// since segments equal to pad are stripped by the parser
 		if (idx != vectorB.length)
 			return false;

 		while (--idx >= 0)
 			if (!vectorA[idx].equals(vectorB[idx]))
 				return false;

 		return true;
 	}

 	static int hashCode(Comparable<?>[] vector, Comparable<?> padValue) {
 		int hashCode = padValue == null ? 31 : padValue.hashCode();
 		int idx = vector.length;
 		while (--idx >= 0) {
 			Object elem = vector[idx];
 			if (elem != null)
 				hashCode += elem.hashCode();
 			hashCode = hashCode * 31;
 		}
 		return hashCode;
 	}

 	static void toString(StringBuffer sb, Comparable<?>[] vector, Comparable<?> padValue, boolean rangeSafe) {
 		int top = vector.length;
 		if (top == 0)
 			// Write one pad value as explicit. It will be considered
 			// redundant and removed by the parser but the raw format
 			// does not allow zero elements
 			VersionFormat.rawToString(sb, rangeSafe, padValue == null ? MIN_VALUE : padValue);
 		else {
 			for (int idx = 0; idx < top; ++idx) {
 				if (idx > 0)
 					sb.append('.');
 				VersionFormat.rawToString(sb, rangeSafe, vector[idx]);
 			}
 		}
 		if (padValue != null) {
 			sb.append('p');
 			VersionFormat.rawToString(sb, rangeSafe, padValue);
 		}
 	}

 	private static int compareReminder(int idx, Comparable<?>[] vector, Comparable<?> padValue, Comparable<?> othersPad) {
 		int cmp;
 		for (cmp = 0; idx < vector.length && cmp == 0; ++idx)
 			cmp = compareSegments(vector[idx], othersPad);
 		if (cmp == 0)
 			cmp = (padValue == null) ? -1 : compareSegments(padValue, othersPad);
 		return cmp;
 	}

 	static int compareSegments(Comparable<?> a, Comparable<?> b) {
 		if (a == b)
 			return 0;

 		if (a instanceof Integer && b instanceof Integer) {
 			int ai = ((Integer) a).intValue();
 			int bi = ((Integer) b).intValue();
 			return ai > bi ? 1 : (ai < bi ? -1 : 0);
 		}

 		if (a instanceof String && b instanceof String)
 			return ((String) a).compareTo((String) b);

 		if (a == MAX_VALUE || a == MIN_VALUE || a == MAXS_VALUE)
 			return ((MinMaxComparable) a).compareTo(b);

 		if (b == MAX_VALUE || b == MIN_VALUE || b == MAXS_VALUE)
 			return -((MinMaxComparable) b).compareTo(a);

 		if (a instanceof Integer)
 			return 1;
 		if (b instanceof Integer)
 			return -1;

 		if (a instanceof VersionVector)
 			return (b instanceof VersionVector) ? ((VersionVector) a).compareTo((VersionVector) b) : 1;
 		if (b instanceof VersionVector)
 			return -1;

 		if (a instanceof EnumDefinition.EnumSegment)
 			return (b instanceof EnumDefinition.EnumSegment) ? ((EnumDefinition.EnumSegment) a).compareTo((EnumDefinition.EnumSegment) b) : 1;
 		if (b instanceof EnumDefinition.EnumSegment)
 			return -1;

 		throw new IllegalArgumentException();
 	}

 	private final Comparable<?> padValue;

 	private final Comparable<?>[] vector;

 	public VersionVector(Comparable<?>[] vector, Comparable<?> pad) {
 		this.vector = vector;
 		this.padValue = (pad == MIN_VALUE) ? null : pad;
 	}

 	@Override
 	public int compareTo(VersionVector ov) {
 		if (ov == this)
 			return 0;

 		return compare(vector, padValue, ov.vector, ov.padValue);
 	}

 	@Override
 	public boolean equals(Object o) {
 		if (o == this)
 			return true;

 		if (!(o instanceof VersionVector))
 			return false;

 		VersionVector ov = (VersionVector) o;
 		return equals(vector, padValue, ov.vector, ov.padValue);
 	}

 	/**
 	 * Returns the pad value used when comparing this versions to
 	 * versions that has a raw vector with a larger number of elements
 	 * @return The pad value or <code>null</code> if not set.
 	 */
 	public Comparable<?> getPad() {
 		return padValue;
 	}

 	/**
 	 * An element from the raw vector
 	 * @param index The zero based index of the desired element
 	 * @return An element from the raw vector
 	 */
 	public Comparable<?> getSegment(int index) {
 		return vector[index];
 	}

 	/**
 	 * Returns the number of elements in the raw vector
 	 * @return The element count
 	 */
 	public int getSegmentCount() {
 		return vector.length;
 	}

 	/**
 	 * This method is package protected since it violates the immutable
 	 * contract.
 	 * @return The raw vector. Must be treated as read-only
 	 */
 	Comparable<?>[] getVector() {
 		return vector;
 	}

 	@Override
 	public int hashCode() {
 		return hashCode(vector, padValue);
 	}

 	@Override
 	public String toString() {
 		StringBuffer sb = new StringBuffer();
 		toString(sb);
 		return sb.toString();
 	}

 	/**
 	 * Append the string representation of this instance to the
 	 * <code>sb</code> buffer.
 	 * @param sb The buffer to append to
 	 */
 	public void toString(StringBuffer sb) {
 		toString(sb, vector, padValue, false);
 	}

 	/**
 	 * Append the string representation of this instance to the
 	 * <code>sb</code> buffer.
 	 * @param sb The buffer to append to
 	 * @param rangeSafe If <code>true</code>, the range delimiters will be escaped
 	 * with backslash.
 	 */
 	void toString(StringBuffer sb, boolean rangeSafe) {
 		toString(sb, vector, padValue, rangeSafe);
 	}

 	private Object readResolve() {
 		VersionVector vv = this;
 		// Preserve the emptyString singleton
 		int idx = vector.length;
 		while (--idx >= 0)
 			if (MINS_VALUE.equals(vector[idx]))
 				vector[idx] = MINS_VALUE;
 		if (MINS_VALUE.equals(padValue))
 			vv = new VersionVector(vector, MINS_VALUE);
 		return vv;
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2009, 2017 Cloudsmith Inc. 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:
	* Cloudsmith Inc. - initial API and implementation
	*******************************************************************************/
	package org.eclipse.equinox.internal.p2.metadata;

	import java.io.Serializable;

	/**
	* The VersionVector represents an array of Comparable objects. The array can be
	* nested since a VersionVector is Comparable in itself.
	*
	* @Immutable
	*/
	public class VersionVector implements Comparable<VersionVector>, Serializable {

	interface MinMaxComparable extends Comparable<Object>, Serializable {
	//
	}

	private static final class MaxStringValue implements MinMaxComparable {
	private static final long serialVersionUID = -4936252230441132767L;

	MaxStringValue() {
	// Empty constructor
	}

	@Override
	public int compareTo(Object o) {
	return o == this ? 0 : (o == MAX_VALUE \|\| o instanceof Integer \|\| o instanceof EnumDefinition.EnumSegment \|\| o instanceof VersionVector ? -1 : 1);
	}

	// For singleton deserialization
	private Object readResolve() {
	return MAXS_VALUE;
	}

	@Override
	public String toString() {
	return "m"; //$NON-NLS-1$
	}
	}

	private static final class MaxValue implements MinMaxComparable {
	private static final long serialVersionUID = -5889641741635253589L;

	MaxValue() {
	// Empty constructor
	}

	@Override
	public int compareTo(Object o) {
	return o == this ? 0 : 1;
	}

	// For singleton deserialization
	private Object readResolve() {
	return MAX_VALUE;
	}

	@Override
	public String toString() {
	return "M"; //$NON-NLS-1$
	}
	}

	private static class MinValue implements MinMaxComparable {
	private static final long serialVersionUID = -1066323980049812226L;

	MinValue() {
	// Empty constructor
	}

	@Override
	public int compareTo(Object o) {
	return o == this ? 0 : -1;
	}

	private Object readResolve() {
	return MIN_VALUE;
	}

	@Override
	public String toString() {
	return "-M"; //$NON-NLS-1$
	}
	}

	/**
	* A value that is greater then any other value
	*/
	public static final Comparable<Object> MAX_VALUE = new MaxValue();

	/**
	* A value that is greater then any string but less then {@link #MAX_VALUE} and
	* any Integer or VersionVector.
	*/
	public static final Comparable<Object> MAXS_VALUE = new MaxStringValue();

	/**
	* A value that is less then any other value
	*/
	public static final Comparable<Object> MIN_VALUE = new MinValue();

	/**
	* A value that is greater then {@link #MIN_VALUE} and less then any string,
	* Integer, or VersionVector (a.k.a. empty_string)
	*/
	public static final String MINS_VALUE = ""; //$NON-NLS-1$

	private static final long serialVersionUID = -8385373304298723744L;

	static int compare(Comparable<?>[] vectorA, Comparable<?> padA, Comparable<?>[] vectorB, Comparable<?> padB) {
	int top = vectorA.length;
	if (top > vectorB.length)
	top = vectorB.length;

	for (int idx = 0; idx < top; ++idx) {
	int cmp = compareSegments(vectorA[idx], vectorB[idx]);
	if (cmp != 0)
	return cmp;
	}

	// All elements compared equal up to this point. Check
	// pad values
	if (top < vectorA.length)
	return (padB == null) ? 1 : compareReminder(top, vectorA, padA, padB);

	if (top < vectorB.length)
	return (padA == null) ? -1 : -compareReminder(top, vectorB, padB, padA);

	// Lengths are equal. Compare pad values
	return padA == null ? (padB == null ? 0 : -1) : (padB == null ? 1 : compareSegments(padA, padB));
	}

	static boolean equals(Comparable<?>[] vectorA, Comparable<?> padValueA, Comparable<?>[] vectorB, Comparable<?> padValueB) {
	// We compare pad first since it is impossible for versions with
	// different pad to be equal (versions are padded to infinity)
	if (padValueA == null) {
	if (padValueB != null)
	return false;
	} else {
	if (padValueB == null \|\| !padValueA.equals(padValueB))
	return false;
	}

	int idx = vectorA.length;

	// If the length of the vector differs, the versions cannot be equal
	// since segments equal to pad are stripped by the parser
	if (idx != vectorB.length)
	return false;

	while (--idx >= 0)
	if (!vectorA[idx].equals(vectorB[idx]))
	return false;

	return true;
	}

	static int hashCode(Comparable<?>[] vector, Comparable<?> padValue) {
	int hashCode = padValue == null ? 31 : padValue.hashCode();
	int idx = vector.length;
	while (--idx >= 0) {
	Object elem = vector[idx];
	if (elem != null)
	hashCode += elem.hashCode();
	hashCode = hashCode * 31;
	}
	return hashCode;
	}

	static void toString(StringBuffer sb, Comparable<?>[] vector, Comparable<?> padValue, boolean rangeSafe) {
	int top = vector.length;
	if (top == 0)
	// Write one pad value as explicit. It will be considered
	// redundant and removed by the parser but the raw format
	// does not allow zero elements
	VersionFormat.rawToString(sb, rangeSafe, padValue == null ? MIN_VALUE : padValue);
	else {
	for (int idx = 0; idx < top; ++idx) {
	if (idx > 0)
	sb.append('.');
	VersionFormat.rawToString(sb, rangeSafe, vector[idx]);
	}
	}
	if (padValue != null) {
	sb.append('p');
	VersionFormat.rawToString(sb, rangeSafe, padValue);
	}
	}

	private static int compareReminder(int idx, Comparable<?>[] vector, Comparable<?> padValue, Comparable<?> othersPad) {
	int cmp;
	for (cmp = 0; idx < vector.length && cmp == 0; ++idx)
	cmp = compareSegments(vector[idx], othersPad);
	if (cmp == 0)
	cmp = (padValue == null) ? -1 : compareSegments(padValue, othersPad);
	return cmp;
	}

	static int compareSegments(Comparable<?> a, Comparable<?> b) {
	if (a == b)
	return 0;

	if (a instanceof Integer && b instanceof Integer) {
	int ai = ((Integer) a).intValue();
	int bi = ((Integer) b).intValue();
	return ai > bi ? 1 : (ai < bi ? -1 : 0);
	}

	if (a instanceof String && b instanceof String)
	return ((String) a).compareTo((String) b);

	if (a == MAX_VALUE \|\| a == MIN_VALUE \|\| a == MAXS_VALUE)
	return ((MinMaxComparable) a).compareTo(b);

	if (b == MAX_VALUE \|\| b == MIN_VALUE \|\| b == MAXS_VALUE)
	return -((MinMaxComparable) b).compareTo(a);

	if (a instanceof Integer)
	return 1;
	if (b instanceof Integer)
	return -1;

	if (a instanceof VersionVector)
	return (b instanceof VersionVector) ? ((VersionVector) a).compareTo((VersionVector) b) : 1;
	if (b instanceof VersionVector)
	return -1;

	if (a instanceof EnumDefinition.EnumSegment)
	return (b instanceof EnumDefinition.EnumSegment) ? ((EnumDefinition.EnumSegment) a).compareTo((EnumDefinition.EnumSegment) b) : 1;
	if (b instanceof EnumDefinition.EnumSegment)
	return -1;

	throw new IllegalArgumentException();
	}

	private final Comparable<?> padValue;

	private final Comparable<?>[] vector;

	public VersionVector(Comparable<?>[] vector, Comparable<?> pad) {
	this.vector = vector;
	this.padValue = (pad == MIN_VALUE) ? null : pad;
	}

	@Override
	public int compareTo(VersionVector ov) {
	if (ov == this)
	return 0;

	return compare(vector, padValue, ov.vector, ov.padValue);
	}

	@Override
	public boolean equals(Object o) {
	if (o == this)
	return true;

	if (!(o instanceof VersionVector))
	return false;

	VersionVector ov = (VersionVector) o;
	return equals(vector, padValue, ov.vector, ov.padValue);
	}

	/**
	* Returns the pad value used when comparing this versions to
	* versions that has a raw vector with a larger number of elements
	* @return The pad value or <code>null</code> if not set.
	*/
	public Comparable<?> getPad() {
	return padValue;
	}

	/**
	* An element from the raw vector
	* @param index The zero based index of the desired element
	* @return An element from the raw vector
	*/
	public Comparable<?> getSegment(int index) {
	return vector[index];
	}

	/**
	* Returns the number of elements in the raw vector
	* @return The element count
	*/
	public int getSegmentCount() {
	return vector.length;
	}

	/**
	* This method is package protected since it violates the immutable
	* contract.
	* @return The raw vector. Must be treated as read-only
	*/
	Comparable<?>[] getVector() {
	return vector;
	}

	@Override
	public int hashCode() {
	return hashCode(vector, padValue);
	}

	@Override
	public String toString() {
	StringBuffer sb = new StringBuffer();
	toString(sb);
	return sb.toString();
	}

	/**
	* Append the string representation of this instance to the
	* <code>sb</code> buffer.
	* @param sb The buffer to append to
	*/
	public void toString(StringBuffer sb) {
	toString(sb, vector, padValue, false);
	}

	/**
	* Append the string representation of this instance to the
	* <code>sb</code> buffer.
	* @param sb The buffer to append to
	* @param rangeSafe If <code>true</code>, the range delimiters will be escaped
	* with backslash.
	*/
	void toString(StringBuffer sb, boolean rangeSafe) {
	toString(sb, vector, padValue, rangeSafe);
	}

	private Object readResolve() {
	VersionVector vv = this;
	// Preserve the emptyString singleton
	int idx = vector.length;
	while (--idx >= 0)
	if (MINS_VALUE.equals(vector[idx]))
	vector[idx] = MINS_VALUE;
	if (MINS_VALUE.equals(padValue))
	vv = new VersionVector(vector, MINS_VALUE);
	return vv;
	}
	}