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/*
* Copyright 2014-2018 Ping Identity Corporation
* All Rights Reserved.
*/
/*
* Copyright (C) 2014-2018 Ping Identity Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPLv2 only)
* or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
package com.unboundid.util;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.StringTokenizer;
/**
* This class provides a data structure that may be used for representing object
* identifiers. Since some directory servers support using strings that aren't
* valid object identifiers where OIDs are required, this implementation
* supports arbitrary strings, but some methods may only be available for valid
* OIDs.
*/
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class OID
implements Serializable, Comparable
{
/**
* The serial version UID for this serializable class.
*/
private static final long serialVersionUID = -4542498394670806081L;
// The numeric components that comprise this OID.
private final List components;
// The string representation for this OID.
private final String oidString;
/**
* Creates a new OID object from the provided string representation.
*
* @param oidString The string to use to create this OID.
*/
public OID(final String oidString)
{
if (oidString == null)
{
this.oidString = "";
}
else
{
this.oidString = oidString;
}
components = parseComponents(oidString);
}
/**
* Creates a new OID object from the provided set of numeric components. At
* least one component must be provided for a valid OID.
*
* @param components The numeric components to include in the OID.
*/
public OID(final int... components)
{
this(toList(components));
}
/**
* Creates a new OID object from the provided set of numeric components. At
* least one component must be provided for a valid OID.
*
* @param components The numeric components to include in the OID.
*/
public OID(final List components)
{
if ((components == null) || components.isEmpty())
{
this.components = null;
oidString = "";
}
else
{
this.components =
Collections.unmodifiableList(new ArrayList<>(components));
final StringBuilder buffer = new StringBuilder();
for (final Integer i : components)
{
if (buffer.length() > 0)
{
buffer.append('.');
}
buffer.append(i);
}
oidString = buffer.toString();
}
}
/**
* Retrieves a list corresponding to the elements in the provided array.
*
* @param components The array to convert to a list.
*
* @return The list of elements.
*/
private static List toList(final int... components)
{
if (components == null)
{
return null;
}
final ArrayList compList = new ArrayList<>(components.length);
for (final int i : components)
{
compList.add(i);
}
return compList;
}
/**
* Parses the provided string as a numeric OID and extracts the numeric
* components from it.
*
* @param oidString The string to parse as a numeric OID.
*
* @return The numeric components extracted from the provided string, or
* {@code null} if the provided string does not represent a valid
* numeric OID.
*/
public static List parseComponents(final String oidString)
{
if ((oidString == null) || oidString.isEmpty() ||
oidString.startsWith(".") || oidString.endsWith(".") ||
(oidString.indexOf("..") > 0))
{
return null;
}
final StringTokenizer tokenizer = new StringTokenizer(oidString, ".");
final ArrayList compList = new ArrayList<>(10);
while (tokenizer.hasMoreTokens())
{
final String token = tokenizer.nextToken();
try
{
compList.add(Integer.parseInt(token));
}
catch (final Exception e)
{
Debug.debugException(e);
return null;
}
}
return Collections.unmodifiableList(compList);
}
/**
* Indicates whether the provided string represents a valid numeric OID. Note
* this this method only ensures that the value is made up of a dotted list of
* numbers that does not start or end with a period and does not contain two
* consecutive periods. The {@link #isStrictlyValidNumericOID(String)} method
* performs additional validation, including ensuring that the OID contains
* at least two components, that the value of the first component is not
* greater than two, and that the value of the second component is not greater
* than 39 if the value of the first component is zero or one.
*
* @param s The string for which to make the determination.
*
* @return {@code true} if the provided string represents a valid numeric
* OID, or {@code false} if not.
*/
public static boolean isValidNumericOID(final String s)
{
return new OID(s).isValidNumericOID();
}
/**
* Indicates whether the provided string represents a valid numeric OID. Note
* this this method only ensures that the value is made up of a dotted list of
* numbers that does not start or end with a period and does not contain two
* consecutive periods. The {@link #isStrictlyValidNumericOID()} method
* performs additional validation, including ensuring that the OID contains
* at least two components, that the value of the first component is not
* greater than two, and that the value of the second component is not greater
* than 39 if the value of the first component is zero or one.
*
* @return {@code true} if this object represents a valid numeric OID, or
* {@code false} if not.
*/
public boolean isValidNumericOID()
{
return (components != null);
}
/**
* Indicates whether this object represents a strictly valid numeric OID.
* In addition to ensuring that the value is made up of a dotted list of
* numbers that does not start or end with a period or contain two consecutive
* periods, this method also ensures that the OID contains at least two
* components, that the value of the first component is not greater than two,
* and that the value of the second component is not greater than 39 if the
* value of the first component is zero or one.
*
* @param s The string for which to make the determination.
*
* @return {@code true} if this object represents a strictly valid numeric
* OID, or {@code false} if not.
*/
public static boolean isStrictlyValidNumericOID(final String s)
{
return new OID(s).isStrictlyValidNumericOID();
}
/**
* Indicates whether this object represents a strictly valid numeric OID.
* In addition to ensuring that the value is made up of a dotted list of
* numbers that does not start or end with a period or contain two consecutive
* periods, this method also ensures that the OID contains at least two
* components, that the value of the first component is not greater than two,
* and that the value of the second component is not greater than 39 if the
* value of the first component is zero or one.
*
* @return {@code true} if this object represents a strictly valid numeric
* OID, or {@code false} if not.
*/
public boolean isStrictlyValidNumericOID()
{
if ((components == null) || (components.size() < 2))
{
return false;
}
final int firstComponent = components.get(0);
final int secondComponent = components.get(1);
switch (firstComponent)
{
case 0:
case 1:
// The value of the second component must not be greater than 39.
return (secondComponent <= 39);
case 2:
// We don't need to do any more validation.
return true;
default:
// Invalid value for the first component.
return false;
}
}
/**
* Retrieves the numeric components that comprise this OID. This will only
* return a non-{@code null} value if {@link #isValidNumericOID} returns
* {@code true}.
*
* @return The numeric components that comprise this OID, or {@code null} if
* this object does not represent a valid numeric OID.
*/
public List getComponents()
{
return components;
}
/**
* Retrieves a hash code for this OID.
*
* @return A hash code for this OID.
*/
@Override()
public int hashCode()
{
if (components == null)
{
return oidString.hashCode();
}
else
{
int hashCode = 0;
for (final int i : components)
{
hashCode += i;
}
return hashCode;
}
}
/**
* Indicates whether the provided object is equal to this OID.
*
* @param o The object for which to make the determination.
*
* @return {@code true} if the provided object is equal to this OID, or
* {@code false} if not.
*/
@Override()
public boolean equals(final Object o)
{
if (o == null)
{
return false;
}
if (o == this)
{
return true;
}
if (o instanceof OID)
{
final OID oid = (OID) o;
if (components == null)
{
return oidString.equals(oid.oidString);
}
else
{
return components.equals(oid.components);
}
}
return false;
}
/**
* Indicates the position of the provided object relative to this OID in a
* sorted list.
*
* @param oid The OID to compare against this OID.
*
* @return A negative value if this OID should come before the provided OID
* in a sorted list, a positive value if this OID should come after
* the provided OID in a sorted list, or zero if the two OIDs
* represent equivalent values.
*/
@Override()
public int compareTo(final OID oid)
{
if (components == null)
{
if (oid.components == null)
{
// Neither is a valid numeric OID, so we'll just compare the string
// representations.
return oidString.compareTo(oid.oidString);
}
else
{
// A valid numeric OID will always come before a non-valid one.
return 1;
}
}
if (oid.components == null)
{
// A valid numeric OID will always come before a non-valid one.
return -1;
}
for (int i=0; i < Math.min(components.size(), oid.components.size()); i++)
{
final int thisValue = components.get(i);
final int thatValue = oid.components.get(i);
if (thisValue < thatValue)
{
// This OID has a lower number in the first non-equal slot than the
// provided OID.
return -1;
}
else if (thisValue > thatValue)
{
// This OID has a higher number in the first non-equal slot than the
// provided OID.
return 1;
}
}
// Where the values overlap, they are equivalent. Make the determination
// based on which is longer.
if (components.size() < oid.components.size())
{
// The provided OID is longer than this OID.
return -1;
}
else if (components.size() > oid.components.size())
{
// The provided OID is shorter than this OID.
return 1;
}
else
{
// They represent equivalent OIDs.
return 0;
}
}
/**
* Retrieves a string representation of this OID.
*
* @return A string representation of this OID.
*/
@Override()
public String toString()
{
return oidString;
}
}
