69 lines
1.5 KiB
Java
69 lines
1.5 KiB
Java
package org.gcube.informationsystem.utils;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.TreeSet;
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import java.util.UUID;
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/**
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* @author Luca Frosini (ISTI - CNR)
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*/
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public final class UUIDManager {
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private static final Set<String> RESERVED_UUID_STRING;
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private static final Set<UUID> RESERVED_UUID;
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private static UUIDManager uuidManager;
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public static UUIDManager getInstance() {
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if(uuidManager==null) {
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uuidManager = new UUIDManager();
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}
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return uuidManager;
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}
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private UUIDManager() {
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}
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static {
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RESERVED_UUID_STRING = new HashSet<>();
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RESERVED_UUID = new HashSet<>();
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String[] uuidValidCharacters = {"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};
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for(String string : uuidValidCharacters) {
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String uuidString = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX";
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uuidString = uuidString.replaceAll("X", string);
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RESERVED_UUID_STRING.add(uuidString);
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RESERVED_UUID.add(UUID.fromString(uuidString));
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}
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}
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public boolean isReservedUUID(UUID uuid) {
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return RESERVED_UUID.contains(uuid);
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}
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public boolean isReservedUUID(String uuid) {
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return RESERVED_UUID_STRING.contains(uuid);
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}
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public Set<String> getAllReservedUUIDAsStrings(){
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return new TreeSet<>(RESERVED_UUID_STRING);
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}
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public Set<UUID> getAllReservedUUID(){
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return new TreeSet<>(RESERVED_UUID);
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}
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public UUID generateValidRandomUUID() {
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UUID generated = UUID.randomUUID();
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while(RESERVED_UUID.contains(generated)) {
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generated = UUID.randomUUID();
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}
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return generated;
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}
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}
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