/**
     * Test method for
     * {@link org.codelibs.core.collection.EmptyIterator#EmptyIterator()}.
     */
    @Test
    public void testEmptyIterator() {
        final EmptyIterator<String> emptyIterator = new EmptyIterator<String>();
        assertThat(emptyIterator, is(notNullValue()));
    }

    /**
     * Test method for {@link org.codelibs.core.collection.EmptyIterator#remove()}
     * .
     */
    @Test

     * .
     */
    @Test
    public void testIsNotEmptyCollectionOfQ() {
        final Collection<String> c = new ArrayList<String>();
        c.add("hoge");
        assertThat(CollectionsUtil.isNotEmpty(c), is(true));
    }

    /**
     * Test method for
     * {@link org.codelibs.core.collection.CollectionsUtil#isEmpty(java.util.Map)}
     * .
     */

    }

    /**
     * Returns {@literal true} if the given {@link Collection} is {@literal null} or empty.
     *
     * @param collection the collection
     * @return {@literal true} if the collection is {@literal null} or empty
     */
    public static boolean isEmpty(final Collection<?> collection) {
        return collection == null || collection.isEmpty();
    }

    /**

        not(not -> not.setId_Term(id), opLambda);
    }

    public void setId_Terms(Collection<String> idList) {
        setId_Terms(idList, null);
    }

    public void setId_Terms(Collection<String> idList, ConditionOptionCall<IdsQueryBuilder> opLambda) {
        IdsQueryBuilder builder = regIdsQ(idList);
        if (opLambda != null) {

        not(not -> not.setId_Term(id), opLambda);
    }

    public void setId_Terms(Collection<String> idList) {
        setId_Terms(idList, null);
    }

    public void setId_Terms(Collection<String> idList, ConditionOptionCall<IdsQueryBuilder> opLambda) {
        IdsQueryBuilder builder = regIdsQ(idList);
        if (opLambda != null) {

        not(not -> not.setId_Term(id), opLambda);
    }

    public void setId_Terms(Collection<String> idList) {
        setId_Terms(idList, null);
    }

    public void setId_Terms(Collection<String> idList, ConditionOptionCall<IdsQueryBuilder> opLambda) {
        IdsQueryBuilder builder = regIdsQ(idList);
        if (opLambda != null) {

        not(not -> not.setId_Term(id), opLambda);
    }

    public void setId_Terms(Collection<String> idList) {
        setId_Terms(idList, null);
    }

    public void setId_Terms(Collection<String> idList, ConditionOptionCall<IdsQueryBuilder> opLambda) {
        IdsQueryBuilder builder = regIdsQ(idList);
        if (opLambda != null) {

        not(not -> not.setId_Term(id), opLambda);
    }

    public void setId_Terms(Collection<String> idList) {
        setId_Terms(idList, null);
    }

    public void setId_Terms(Collection<String> idList, ConditionOptionCall<IdsQueryBuilder> opLambda) {
        IdsQueryBuilder builder = regIdsQ(idList);
        if (opLambda != null) {

- **Reduced memory allocation** in collection operations and bean copying
- **Improved reflection performance** with cached descriptors and optimized field access
- **Enhanced collection operations** with Java 21 sequenced collections support
- **Better concurrent performance** using modern concurrent collection implementations

## 🔧 Configuration

### Logging Configuration

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.core.collection;

import java.io.Serializable;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

/**
 * {@link Set} that is case-insensitive.
 *
 * @author higa
 */