java.util.IdentityHashMap.clone()方法的使用及代码示例

x33g5p2x  于2022-01-20 转载在 其他  
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本文整理了Java中java.util.IdentityHashMap.clone()方法的一些代码示例，展示了IdentityHashMap.clone()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。IdentityHashMap.clone()方法的具体详情如下：
包路径：java.util.IdentityHashMap
类名称：IdentityHashMap
方法名：clone

IdentityHashMap.clone介绍

[英]Returns a shallow copy of this identity hash map: the keys and values themselves are not cloned.
[中]返回此标识哈希映射的浅层副本：不会克隆键和值本身。

代码示例

代码示例来源：origin: SpongePowered/SpongeAPI

/**
 * Attempts to use native {@link Object#clone()} methods on available map
 * types. If a map cannot be properly cloned, a new {@link HashMap} is
 * returned.
 *
 * @param map The map input
 * @param <K> The key type
 * @param <V> The value type
 * @return A copied map
 */
@SuppressWarnings("unchecked")
public static <K, V> Map<K, V> copyMap(Map<? extends K, ? extends V> map) {
  try {
    if (map instanceof HashMap) {
      return (Map<K, V>) ((HashMap<? extends K, ? extends V>) map).clone();
    } else if (map instanceof IdentityHashMap) {
      return (Map<K, V>) ((IdentityHashMap<?, ?>) map).clone();
    } else if (map instanceof EnumMap) {
      return (Map<K, V>) ((EnumMap<?, V>) map).clone();
    } else if (map instanceof TreeMap) {
      return (Map<K, V>) ((TreeMap<K, V>) map).clone();
    } else if (map instanceof ConcurrentHashMap) {
      return (Map<K, V>) new ConcurrentHashMap<>(map);
    }
  } catch (Exception ignored) {
  }
  return new HashMap<>(map);
}

代码示例来源：origin: com.github.ansell.pellet/pellet-common

@SuppressWarnings("unchecked")
public Object clone() {
  try {
    IdentityHashSet<T> newSet = (IdentityHashSet<T>) super.clone();
    newSet.map = (IdentityHashMap<T, Object>) map.clone();
    return newSet;
  } catch( CloneNotSupportedException e ) {
    throw new InternalError();
  }
}

代码示例来源：origin: alibaba/webx-restful

@SuppressWarnings("unchecked")
  public Object clone() {
    try {
      IdentityHashSet<E> newSet = (IdentityHashSet<E>) super.clone();
      newSet.map = (IdentityHashMap<E, Object>) map.clone();
      return newSet;
    } catch (CloneNotSupportedException e) {
      throw new InternalError();
    }
  }
}

代码示例来源：origin: org.zkoss.common/zcommon

@SuppressWarnings("unchecked")
public Object clone() {
  try { 
    IdentityHashSet<T> newSet = (IdentityHashSet<T>)super.clone();
    newSet._map = (IdentityHashMap<T, Object>)_map.clone();
    return newSet;
  } catch (CloneNotSupportedException e) { 
    throw new InternalError();
  }
}

代码示例来源：origin: net.sourceforge.owlapi/pellet-core-ignazio1977

@SuppressWarnings("unchecked")
public Object clone() {
  try {
    IdentityHashSet<T> newSet = (IdentityHashSet<T>) super.clone();
    newSet.map = (IdentityHashMap<T, Object>) map.clone();
    return newSet;
  } catch( CloneNotSupportedException e ) {
    throw new InternalError();
  }
}

代码示例来源：origin: de.unkrig.commons/commons-util

@Override public Object
  clone() {
    try {
      @SuppressWarnings("unchecked") IdentityHashSet<E>
      newSet = (IdentityHashSet<E>) super.clone();

      @SuppressWarnings("unchecked") IdentityHashMap<E, Object>
      map = (IdentityHashMap<E, Object>) this.map.clone();

      newSet.map = map;

      return newSet;
    } catch (CloneNotSupportedException e) {
      throw new InternalError();
    }
  }
}

代码示例来源：origin: de.unkrig/de-unkrig-commons

@Override public Object
  clone() {
    try {
      @SuppressWarnings("unchecked") IdentityHashSet<E>
      newSet = (IdentityHashSet<E>) super.clone();

      @SuppressWarnings("unchecked") IdentityHashMap<E, Object>
      map = (IdentityHashMap<E, Object>) this.map.clone();

      newSet.map = map;

      return newSet;
    } catch (CloneNotSupportedException e) {
      throw new InternalError();
    }
  }
}

代码示例来源：origin: Galigator/openllet

@Override
@SuppressWarnings("unchecked")
public Object clone()
{
  try
  {
    final IdentityHashSet<T> newSet = (IdentityHashSet<T>) super.clone();
    newSet._map = (IdentityHashMap<T, Object>) _map.clone();
    return newSet;
  }
  catch (final CloneNotSupportedException e)
  {
    throw new InternalError();
  }
}

代码示例来源：origin: com.globalmentor/globalmentor-core

/**
   * Returns a shallow copy of this <code>HashSet</code> instance: the elements themselves are not cloned.
   *
   * @return a shallow copy of this set.
   */
  public Object clone() {
    try {
      IdentityHashSet<E> newSet = (IdentityHashSet<E>)super.clone();
      newSet.map = (IdentityHashMap<E, Object>)map.clone();
      return newSet;
    } catch(CloneNotSupportedException e) {
      throw new InternalError();
    }
  }
}

代码示例来源：origin: org.compass-project/compass

/**
   * Returns a shallow copy of this <tt>HashSet</tt> instance: the elements
   * themselves are not cloned.
   *
   * @return a shallow copy of this set.
   */
  public Object clone() {
    try {
      IdentityHashSet<E> newSet = (IdentityHashSet<E>) super.clone();
      newSet.map = (IdentityHashMap<E, Object>) map.clone();
      return newSet;
    } catch (CloneNotSupportedException e) {
      throw new InternalError();
    }
  }
}

代码示例来源：origin: at.molindo/molindo-utils

/**
 * Returns a shallow copy of this <tt>HashSet</tt> instance: the elements
 * themselves are not cloned.
 * 
 * @return a shallow copy of this set
 */
@Override
@SuppressWarnings("unchecked")
public IdentityHashSet<E> clone() {
  try {
    IdentityHashSet<E> newSet = (IdentityHashSet<E>) super.clone();
    newSet.map = (IdentityHashMap<E, Object>) map.clone();
    return newSet;
  } catch (CloneNotSupportedException e) {
    throw new InternalError();
  }
}

代码示例来源：origin: Galigator/openllet

@Override
@SuppressWarnings("unchecked")
public Object clone()
{
  try
  {
    final IdentityHashSet<T> newSet = (IdentityHashSet<T>) super.clone();
    newSet._map = (IdentityHashMap<T, Object>) _map.clone();
    return newSet;
  }
  catch (final CloneNotSupportedException e)
  {
    throw new InternalError();
  }
}

代码示例来源：origin: com.haulmont.thirdparty/eclipselink

/**
 * This method is used internally to clone a map that holds the persistenceContexts.  A weak map is returned if ReferenceMode is weak.  
 * 
 */
protected Map cloneMap(Map map){
  // bug 270413.  This method is needed to avoid the class cast exception when the reference mode is weak.
  if (this.referenceMode != null && this.referenceMode != ReferenceMode.HARD) return (IdentityWeakHashMap)((IdentityWeakHashMap)map).clone();
  return (IdentityHashMap)((IdentityHashMap)map).clone();
}

代码示例来源：origin: org.eclipse.persistence/com.springsource.org.eclipse.persistence

/**
 * This method is used internally to clone a map that holds the persistenceContexts.  A weak map is returned if ReferenceMode is weak.  
 * 
 */
protected Map cloneMap(Map map){
  // bug 270413.  This method is needed to avoid the class cast exception when the reference mode is weak.
  if (this.referenceMode != null && this.referenceMode != ReferenceMode.HARD) return (IdentityWeakHashMap)((IdentityWeakHashMap)map).clone();
  return (IdentityHashMap)((IdentityHashMap)map).clone();
}

代码示例来源：origin: org.eclipse.persistence/org.eclipse.persistence.core

/**
 * This method is used internally to clone a map that holds the persistenceContexts.  A weak map is returned if ReferenceMode is weak.
 *
 */
protected Map cloneMap(Map map){
  // bug 270413.  This method is needed to avoid the class cast exception when the reference mode is weak.
  if (this.referenceMode != null && this.referenceMode != ReferenceMode.HARD) return (IdentityWeakHashMap)((IdentityWeakHashMap)map).clone();
  return (IdentityHashMap)((IdentityHashMap)map).clone();
}

代码示例来源：origin: net.iot-solutions.graphdb/jcypher

@SuppressWarnings("unchecked")
public void beginTx() {
  if (this.transactionState.get() == null) {
    TransactionState txState = new TransactionState();
    txState.unsaved = (List<DOType>) ((ArrayList<DOType>) this.unsaved).clone();
    if (this.nursery != null)
      txState.nursery = (Map<Object, DomainObject>) ((IdentityHashMap<Object, DomainObject>)this.nursery).clone();
    txState.version = this.version;
    this.transactionState.set(txState);
  }
}

代码示例来源：origin: Wolfgang-Schuetzelhofer/jcypher

@SuppressWarnings("unchecked")
public void beginTx() {
  if (this.transactionState.get() == null) {
    TransactionState txState = new TransactionState();
    txState.unsaved = (List<DOType>) ((ArrayList<DOType>) this.unsaved).clone();
    if (this.nursery != null)
      txState.nursery = (Map<Object, DomainObject>) ((IdentityHashMap<Object, DomainObject>)this.nursery).clone();
    txState.version = this.version;
    this.transactionState.set(txState);
  }
}

代码示例来源：origin: com.atlassian.org.eclipse.sisu/org.eclipse.sisu.inject

public Map<Binding<T>, BeanEntry<Q, T>> flush()
{
  long now = 0;
  if ( mutated && ( null == readCache || ( now = System.currentTimeMillis() ) - lastTimeMillis > REFRESH_MILLIS ) )
  {
    synchronized ( this )
    {
      if ( mutated )
      {
        readCache = (Map) ( (IdentityHashMap) get() ).clone();
        lastTimeMillis = now == 0 ? System.currentTimeMillis() : now;
        mutated = false;
      }
    }
  }
  return readCache;
}

代码示例来源：origin: org.spongepowered/spongeapi

/**
 * Attempts to use native {@link Object#clone()} methods on available map
 * types. If a map cannot be properly cloned, a new {@link HashMap} is
 * returned.
 *
 * @param map The map input
 * @param <K> The key type
 * @param <V> The value type
 * @return A copied map
 */
@SuppressWarnings("unchecked")
public static <K, V> Map<K, V> copyMap(Map<? extends K, ? extends V> map) {
  try {
    if (map instanceof HashMap) {
      return (Map<K, V>) ((HashMap<? extends K, ? extends V>) map).clone();
    } else if (map instanceof IdentityHashMap) {
      return (Map<K, V>) ((IdentityHashMap<?, ?>) map).clone();
    } else if (map instanceof EnumMap) {
      return (Map<K, V>) ((EnumMap<?, V>) map).clone();
    } else if (map instanceof TreeMap) {
      return (Map<K, V>) ((TreeMap<K, V>) map).clone();
    }
    return Maps.newHashMap(map);
  } catch (Exception e) {
    return Maps.newHashMap(map);
  }
}

代码示例来源：origin: xap/xap

IdentityHashMap<IMethod, LRMIMethod> cloneMap = (IdentityHashMap) identityMethodMap.clone();
cloneMap.put(method, lrmiMethod);
identityMethodMap = cloneMap;

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