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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.Iterator;

/**
 * Created with IntelliJ IDEA.
 * User: luog
 * Date: 4/10/13
 * Time: 10:38 AM
 * To change this template use File | Settings | File Templates.
 */
class MappedIterator implements Iterator {

    private Iterator data;
    private $.F1 mapper;

    MappedIterator
    (Iterator itr, $.Function mapper) {
        E.NPE(itr, mapper);
        this.data = itr;
        this.mapper = $.f1(mapper);
    }

    protected Iterator data() {
        return data;
    }

    protected $.F1 mapper() {
        return mapper;
    }

    @Override
    public boolean hasNext() {
        return data.hasNext();
    }

    @Override
    public R next() {
        return mapper.apply(data.next());
    }

    @Override
    public void remove() {
        data.remove();
    }

    @Override
    public int hashCode() {
        return $.hc(data, mapper);
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (obj instanceof MappedIterator) {
            MappedIterator that = (MappedIterator)obj;
            return $.eq(that.data, data) && $.eq(that.mapper, mapper);
        }
        return false;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder("MappedIterator\nmapper[");
        sb.append(mapper).append("]\nbuf[\n").append(data).append("\n]");
        return sb.toString();
    }
}