package project.contract;
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import java.util.HashSet;
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import java.util.Set;
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public class ContractLock {
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private static final Set<String> filter = new HashSet<String>();
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public static boolean add(String order_no) {
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if (!filter.add(order_no)) {
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return false;
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} else {
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return true;
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}
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}
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public static void remove(String order_no) {
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filter.remove(order_no);
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}
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}
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