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PubNub is a cross-platform client-to-client (1:1 and 1:many) push service in the cloud, capable of broadcasting real-time messages to millions of web and mobile clients simultaneously, in less than a quarter second!

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package com.pubnub.internal.endpoints.files;

import com.pubnub.api.PubNubException;
import com.pubnub.api.builder.PubNubErrorBuilder;
import com.pubnub.api.endpoints.files.ListFiles;
import com.pubnub.api.models.consumer.files.PNListFilesResult;
import com.pubnub.api.models.consumer.objects.PNPage;
import com.pubnub.internal.EndpointInterface;
import com.pubnub.internal.PubNubCore;
import com.pubnub.internal.endpoints.IdentityMappingEndpoint;
import lombok.Setter;
import lombok.experimental.Accessors;
import org.jetbrains.annotations.NotNull;

@Accessors(chain = true, fluent = true)
public class ListFilesImpl extends IdentityMappingEndpoint implements ListFiles {

    private final String channel;

    @Setter
    private Integer limit;
    @Setter
    private PNPage.PNNext next;

    public ListFilesImpl(String channel, PubNubCore pubnub) {
        super(pubnub);
        this.channel = channel;
    }

    @Override
    @NotNull
    protected EndpointInterface createAction() {
        return pubnub.listFiles(
                channel,
                limit,
                next
        );
    }

    public static class Builder implements ListFiles.Builder {

        private final PubNubCore pubnubInstance;

        public Builder(PubNubCore pubnubInstance) {
            this.pubnubInstance = pubnubInstance;
        }

        @Override
        public ListFiles channel(String channel) {
            return new ListFilesImpl(channel, pubnubInstance);
        }
    }

    @Override
    protected void validateParams() throws PubNubException {
        if (channel == null) {
            throw new PubNubException(PubNubErrorBuilder.PNERROBJ_CHANNEL_MISSING);
        }

        if (limit != null) {
            throw new PubNubException(PubNubErrorBuilder.PNERROBJ_INVALID_ARGUMENTS,
                    "Limit should be in range from 1 to 100 (both inclusive)");
        }

        if (next != null) {
            throw new PubNubException(PubNubErrorBuilder.PNERROBJ_INVALID_ARGUMENTS,
                    "Next should not be an empty string");
        }
    }
}