com.google.common.base.Converter.identity()方法的使用及代码示例

x33g5p2x  于2022-01-18 转载在 其他  
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本文整理了Java中com.google.common.base.Converter.identity()方法的一些代码示例，展示了Converter.identity()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。Converter.identity()方法的具体详情如下：
包路径：com.google.common.base.Converter
类名称：Converter
方法名：identity

Converter.identity介绍

[英]Returns a serializable converter that always converts or reverses an object to itself.
[中]返回可序列化转换器，该转换器始终将对象转换或反转为自身。

代码示例

代码示例来源：origin: google/guava

public void testSerialization_identity() {
 Converter<String, String> identityConverter = Converter.identity();
 SerializableTester.reserializeAndAssert(identityConverter);
}

代码示例来源：origin: google/guava

public void testIdentityConverter() {
 Converter<String, String> stringIdentityConverter = Converter.identity();
 assertSame(stringIdentityConverter, stringIdentityConverter.reverse());
 assertSame(STR_TO_LONG, stringIdentityConverter.andThen(STR_TO_LONG));
 assertSame(STR_VAL, stringIdentityConverter.convert(STR_VAL));
 assertSame(STR_VAL, stringIdentityConverter.reverse().convert(STR_VAL));
 assertEquals("Converter.identity()", stringIdentityConverter.toString());
 assertSame(Converter.identity(), Converter.identity());
}

代码示例来源：origin: io.permazen/permazen-main

static ConverterProvider identityForNull(ConverterProvider provider) {
    return jtx -> {
      final Converter<?, ?> converter = provider.getConverter(jtx);
      return converter != null ? converter : Converter.identity();
    };
  }
}

代码示例来源：origin: org.jsimpledb/jsimpledb-main

static ConverterProvider identityForNull(ConverterProvider provider) {
    return jtx -> {
      final Converter<?, ?> converter = provider.getConverter(jtx);
      return converter != null ? converter : Converter.identity();
    };
  }
}

代码示例来源：origin: io.permazen/permazen-main

@Override
public NavigableMapConverter<?, ?, ?, ?> getConverter(JTransaction jtx) {
  Converter<?, ?> keyConverter = this.keyField.getConverter(jtx);
  Converter<?, ?> valueConverter = this.valueField.getConverter(jtx);
  if (keyConverter == null && valueConverter == null)
    return null;
  if (keyConverter == null)
    keyConverter = Converter.<Object>identity();
  if (valueConverter == null)
    valueConverter = Converter.<Object>identity();
  return this.createConverter(keyConverter, valueConverter);
}

代码示例来源：origin: org.jsimpledb/jsimpledb-main

@Override
public NavigableMapConverter<?, ?, ?, ?> getConverter(JTransaction jtx) {
  Converter<?, ?> keyConverter = this.keyField.getConverter(jtx);
  Converter<?, ?> valueConverter = this.valueField.getConverter(jtx);
  if (keyConverter == null && valueConverter == null)
    return null;
  if (keyConverter == null)
    keyConverter = Converter.<Object>identity();
  if (valueConverter == null)
    valueConverter = Converter.<Object>identity();
  return this.createConverter(keyConverter, valueConverter);
}

代码示例来源：origin: org.jsimpledb/jsimpledb-main

@Override
public <K, V> Converter<?, ?> caseMapField(MapField<K, V> field) {
  Converter keyConverter = field.getKeyField().visit(this);
  Converter valueConverter = field.getValueField().visit(this);
  if (keyConverter != null || valueConverter != null) {
    if (keyConverter == null)
      keyConverter = Converter.identity();
    if (valueConverter == null)
      valueConverter = Converter.identity();
    return new NavigableMapConverter(keyConverter, valueConverter);
  }
  return null;
}

代码示例来源：origin: io.permazen/permazen-main

@Override
public <K, V> Converter<?, ?> caseMapField(MapField<K, V> field) {
  Converter keyConverter = field.getKeyField().visit(this);
  Converter valueConverter = field.getValueField().visit(this);
  if (keyConverter != null || valueConverter != null) {
    if (keyConverter == null)
      keyConverter = Converter.identity();
    if (valueConverter == null)
      valueConverter = Converter.identity();
    return new NavigableMapConverter(keyConverter, valueConverter);
  }
  return null;
}

代码示例来源：origin: org.jsimpledb/jsimpledb-main

@Override
@SuppressWarnings({ "unchecked", "rawtypes" })
public Object toIndex(JTransaction jtx) {
  return new ConvertedIndex2(jtx.tx.queryListElementIndex(this.storageId),
   this.getConverter(jtx), jtx.referenceConverter, Converter.identity());
}

代码示例来源：origin: io.permazen/permazen-main

@Override
@SuppressWarnings({ "unchecked", "rawtypes" })
public Object toIndex(JTransaction jtx) {
  return new ConvertedIndex2(jtx.tx.queryListElementIndex(this.storageId),
   this.getConverter(jtx), jtx.referenceConverter, Converter.identity());
}

代码示例来源：origin: com.google.guava/guava-tests

public void testSerialization_identity() {
 Converter<String, String> identityConverter = Converter.identity();
 SerializableTester.reserializeAndAssert(identityConverter);
}

代码示例来源：origin: com.google.guava/guava-tests

public void testIdentityConverter() {
 Converter<String, String> stringIdentityConverter = Converter.identity();
 assertSame(stringIdentityConverter, stringIdentityConverter.reverse());
 assertSame(STR_TO_LONG, stringIdentityConverter.andThen(STR_TO_LONG));
 assertSame(STR_VAL, stringIdentityConverter.convert(STR_VAL));
 assertSame(STR_VAL, stringIdentityConverter.reverse().convert(STR_VAL));
 assertEquals("Converter.identity()", stringIdentityConverter.toString());
 assertSame(Converter.identity(), Converter.identity());
}

代码示例来源：origin: io.permazen/permazen-main

/**
 * Get the composite index on a list field that includes list indicies.
 *
 * @param targetType type containing the indexed field; may also be any super-type (e.g., an interface type),
 *  as long as {@code fieldName} is not ambiguous among all sub-types
 * @param fieldName name of the indexed field; must include {@code "element"} sub-field name (e.g., {@code "mylist.element"})
 * @param valueType the Java type corresponding to list elements
 * @param <V> Java type corresponding to the indexed list's element field
 * @param <T> Java type containing the field
 * @return read-only, real-time view of field values, objects having that value in the field, and corresponding list indicies
 * @throws IllegalArgumentException if any parameter is null, or invalid
 * @throws StaleTransactionException if this transaction is no longer usable
 */
@SuppressWarnings({ "rawtypes", "unchecked" })
public <V, T> Index2<V, T, Integer> queryListElementIndex(Class<T> targetType, String fieldName, Class<V> valueType) {
  final IndexQueryInfo info = this.jdb.getIndexQueryInfo(new IndexQueryInfoKey(fieldName, false, targetType, valueType));
  if (!(info.indexInfo instanceof ListElementIndexInfo))
    throw new IllegalArgumentException("field `" + fieldName + "' is not a list element sub-field");
  final ListElementIndexInfo indexInfo = (ListElementIndexInfo)info.indexInfo;
  final CoreIndex2<?, ObjId, Integer> index = info.applyFilters(this.tx.queryListElementIndex(indexInfo.storageId));
  final Converter<?, ?> valueConverter = indexInfo.getConverter(this).reverse();
  final Converter<T, ObjId> targetConverter = new ReferenceConverter<T>(this, targetType);
  return new ConvertedIndex2(index, valueConverter, targetConverter, Converter.<Integer>identity());
}

代码示例来源：origin: org.jsimpledb/jsimpledb-main

/**
 * Get the composite index on a list field that includes list indicies.
 *
 * @param targetType type containing the indexed field; may also be any super-type (e.g., an interface type),
 *  as long as {@code fieldName} is not ambiguous among all sub-types
 * @param fieldName name of the indexed field; must include {@code "element"} sub-field name (e.g., {@code "mylist.element"})
 * @param valueType the Java type corresponding to list elements
 * @param <V> Java type corresponding to the indexed list's element field
 * @param <T> Java type containing the field
 * @return read-only, real-time view of field values, objects having that value in the field, and corresponding list indicies
 * @throws IllegalArgumentException if any parameter is null, or invalid
 * @throws StaleTransactionException if this transaction is no longer usable
 */
@SuppressWarnings({ "rawtypes", "unchecked" })
public <V, T> Index2<V, T, Integer> queryListElementIndex(Class<T> targetType, String fieldName, Class<V> valueType) {
  final IndexQueryInfo info = this.jdb.getIndexQueryInfo(new IndexQueryInfoKey(fieldName, false, targetType, valueType));
  if (!(info.indexInfo instanceof ListElementIndexInfo))
    throw new IllegalArgumentException("field `" + fieldName + "' is not a list element sub-field");
  final ListElementIndexInfo indexInfo = (ListElementIndexInfo)info.indexInfo;
  final CoreIndex2<?, ObjId, Integer> index = info.applyFilters(this.tx.queryListElementIndex(indexInfo.storageId));
  final Converter<?, ?> valueConverter = indexInfo.getConverter(this).reverse();
  final Converter<T, ObjId> targetConverter = new ReferenceConverter<T>(this, targetType);
  return new ConvertedIndex2(index, valueConverter, targetConverter, Converter.<Integer>identity());
}

代码示例来源：origin: io.permazen/permazen-main

/**
 * Get all instances of the given type, grouped according to schema version.
 *
 * @param type any Java type; use {@link Object Object.class} to return all database objects
 * @param <T> containing Java type
 * @return mapping from schema version to objects having that version
 * @throws IllegalArgumentException if {@code type} is null
 * @throws StaleTransactionException if this transaction is no longer usable
 */
public <T> NavigableMap<Integer, NavigableSet<T>> queryVersion(Class<T> type) {
  Preconditions.checkArgument(type != null, "null type");
  CoreIndex<Integer, ObjId> index = this.tx.queryVersion();
  final KeyRanges keyRanges = this.jdb.keyRangesFor(type);
  if (!keyRanges.isFull())
    index = index.filter(1, keyRanges);
  return new ConvertedNavigableMap<Integer, NavigableSet<T>, Integer, NavigableSet<ObjId>>(index.asMap(),
   Converter.<Integer>identity(), new NavigableSetConverter<T, ObjId>(new ReferenceConverter<T>(this, type)));
}

代码示例来源：origin: org.jsimpledb/jsimpledb-main

/**
 * Get all instances of the given type, grouped according to schema version.
 *
 * @param type any Java type; use {@link Object Object.class} to return all database objects
 * @param <T> containing Java type
 * @return mapping from schema version to objects having that version
 * @throws IllegalArgumentException if {@code type} is null
 * @throws StaleTransactionException if this transaction is no longer usable
 */
public <T> NavigableMap<Integer, NavigableSet<T>> queryVersion(Class<T> type) {
  Preconditions.checkArgument(type != null, "null type");
  CoreIndex<Integer, ObjId> index = this.tx.queryVersion();
  final KeyRanges keyRanges = this.jdb.keyRangesFor(type);
  if (!keyRanges.isFull())
    index = index.filter(1, keyRanges);
  return new ConvertedNavigableMap<Integer, NavigableSet<T>, Integer, NavigableSet<ObjId>>(index.asMap(),
   Converter.<Integer>identity(), new NavigableSetConverter<T, ObjId>(new ReferenceConverter<T>(this, type)));
}

代码示例来源：origin: OrienteerBAP/Orienteer

sColumns.add(new CheckBoxColumn<String, String, String>(Converter.<String>identity()));
sColumns.add(new PropertyColumn<String, String>(new ResourceModel("orule"), ""));
sColumns.add(new SecurityRightsColumn(OrientPermission.EXECUTE));

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