org.osgl.util.IteratorTrav Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of osgl-tool Show documentation

A simple Java toolkit

The newest version!

package org.osgl.util;

/*-
 * #%L
 * Java Tool
 * %%
 * Copyright (C) 2014 - 2017 OSGL (Open Source General Library)
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import org.osgl.$;

import java.util.EnumSet;
import java.util.Iterator;

/**
 * A simple readonly {@link C.Traversable} implementation based on an {@link java.util.Iterator}
 */
class IteratorTrav extends TraversableBase {

    private Iterator itr_;

    private EnumSet features;

    IteratorTrav(Iterator iterator) {
        E.NPE(iterator);
        itr_ = iterator;
    }

    @Override
    protected EnumSet initFeatures() {
        return EnumSet.of(C.Feature.READONLY);
    }

    @Override
    public Iterator iterator() {
        return itr_;
    }

    @Override
    public int size() throws UnsupportedOperationException {
        throw new UnsupportedOperationException();
    }

    @Override
    public  C.Traversable map($.Function mapper) {
        return new IteratorTrav(new MappedIterator(itr_, mapper));
    }

    @Override
    public  C.Traversable flatMap($.Function> mapper
    ) {
        return new IteratorTrav(new FlatMappedIterator(itr_, mapper));
    }

    @Override
    public C.Traversable filter($.Function predicate) {
        return new IteratorTrav(new FilteredIterator(itr_, predicate));
    }


}