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A plugin API for Minecraft: Java Edition

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/*
 * This file is part of SpongeAPI, licensed under the MIT License (MIT).
 *
 * Copyright (c) SpongePowered 
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.spongepowered.api.block.entity;

import org.spongepowered.api.data.Keys;
import org.spongepowered.api.data.value.Value;
import org.spongepowered.api.item.ItemTypes;
import org.spongepowered.api.item.inventory.ItemStackSnapshot;

/**
 * Represents a Lectern.
 */
public interface Lectern extends BlockEntity {

    /**
     * {@link Keys#ITEM_STACK_SNAPSHOT}
     *
     * Note that offering an item other than a
     * {@link ItemTypes#WRITABLE_BOOK} or a {@link ItemTypes#WRITTEN_BOOK}
     * will result in the lectern not opening when interacted with.
     *
     * @return A snapshot of the book in the lectern.
     */
    default Value.Mutable item() {
        return this.requireValue(Keys.ITEM_STACK_SNAPSHOT).asMutable();
    }
}