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A general programming library in Java/Android. It's easy to learn and simple to use with concise and powerful APIs.
There is a newer version: 2.1.12
/*
 * Copyright (c) 2020, Haiyang Li.
 *
 * 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.
 */

package com.landawn.abacus.util;

import java.util.Collection;
import java.util.List;
import java.util.ListIterator;

import com.landawn.abacus.util.function.Supplier;

public final class LazyList extends LazyCollection implements List {
    private List list;

    LazyList(final Supplier> supplier) {
        super(supplier);
    }

    @Override
    protected void init() {
        if (isInitialized == false) {
            super.init();
            list = (List) coll;
        }
    }

    public static  LazyList of(final ListSupplier supplier) {
        return new LazyList(supplier);
    }

    /**
     * 
     * @param 
     * @param supplier
     * @return
     * @deprecated throws {@code UnsupportedOperationException}
     * @throws UnsupportedOperationException
     */
    @Deprecated
    public static  LazyCollection of(final Supplier> supplier) throws UnsupportedOperationException {
        throw new UnsupportedOperationException();
    }

    @Override
    public T get(int index) {
        if (isInitialized == false) {
            init();
        }

        return list.get(index);
    }

    @Override
    public T set(int index, T element) {
        if (isInitialized == false) {
            init();
        }

        return list.set(index, element);
    }

    @Override
    public void add(int index, T element) {
        if (isInitialized == false) {
            init();
        }

        list.add(index, element);

    }

    @Override
    public boolean addAll(int index, Collection c) {
        if (isInitialized == false) {
            init();
        }

        return list.addAll(index, c);
    }

    @Override
    public T remove(int index) {
        if (isInitialized == false) {
            init();
        }

        return list.remove(index);
    }

    @Override
    public int indexOf(Object o) {
        if (isInitialized == false) {
            init();
        }

        return list.indexOf(o);
    }

    @Override
    public int lastIndexOf(Object o) {
        if (isInitialized == false) {
            init();
        }

        return list.lastIndexOf(o);
    }

    @Override
    public ListIterator listIterator() {
        if (isInitialized == false) {
            init();
        }

        return list.listIterator();
    }

    @Override
    public ListIterator listIterator(int index) {
        if (isInitialized == false) {
            init();
        }

        return list.listIterator(index);
    }

    @Override
    public List subList(int fromIndex, int toIndex) {
        if (isInitialized == false) {
            init();
        }

        return list.subList(fromIndex, toIndex);
    }

    @Override
    public int hashCode() {
        if (isInitialized == false) {
            init();
        }

        return list.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        if (isInitialized == false) {
            init();
        }

        return obj instanceof LazyList && list.equals(obj);
    }

    @Override
    public String toString() {
        if (isInitialized == false) {
            init();
        }

        return list.toString();
    }

    public static interface ListSupplier extends Supplier> {

        @Override
        List get();
    }
}