com.driver733.vkuploader.wallpost.attachment.support.strings.AttachmentStringsFromJson.java Source code

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Here is the source code for com.driver733.vkuploader.wallpost.attachment.support.strings.AttachmentStringsFromJson.java

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2018 Mikhail Yakushin
 *
 * 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 NON-INFRINGEMENT. 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 com.driver733.vkuploader.wallpost.attachment.support.strings;

import com.driver733.vkuploader.wallpost.attachment.support.string.AttachmentStringFromJson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.jcabi.aspects.Immutable;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * Returns an attachments string for
 *  a wall post from a response json.
 *
 *
 *
 * @since 0.1
 */
@Immutable
public final class AttachmentStringsFromJson implements AttachmentStrings {

    /**
     * Group ID.
     */
    private final int group;

    /**
     * A {@link JsonElement} that contains attachment attachmentString(s).
     */
    private final JsonElement root;

    /**
     * Ctor.
     * @param root A {@link JsonElement}
     *  that contains attachment attachmentString(s).
     * @param group Group ID.
     */
    public AttachmentStringsFromJson(final JsonElement root, final int group) {
        this.root = root;
        this.group = group;
    }

    @Override
    @SuppressWarnings("PMD.AvoidInstantiatingObjectsInLoops")
    public List<String> attachmentStrings() throws IOException {
        final List<String> list;
        try {
            if (this.root.isJsonArray()) {
                list = new ArrayList<>(this.root.getAsJsonArray().size());
                final JsonArray array = this.root.getAsJsonArray();
                for (final JsonElement element : array) {
                    list.add(
                            new AttachmentStringFromJson(element.getAsJsonObject(), this.group).attachmentString());
                }
            } else {
                list = new ArrayList<>(1);
                list.add(new AttachmentStringFromJson(this.root, this.group).attachmentString());
            }
        } catch (final IOException ex) {
            throw new IOException("Could not extract attachment attachmentString.", ex);
        }
        return list;
    }

}