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package io.swagger.codegen.v3.generators.handlebars;

import com.github.jknack.handlebars.Helper;
import com.github.jknack.handlebars.Options;
import io.swagger.codegen.v3.VendorExtendable;

import java.io.IOException;

import static io.swagger.codegen.v3.generators.handlebars.ExtensionHelper.getBooleanValue;

public abstract class NoneExtensionHelper implements Helper {

    public abstract String getPreffix();

    @Override
    public Object apply(VendorExtendable vendor, Options options) throws IOException {
        final Options.Buffer buffer = options.buffer();
        if (vendor == null) {
            buffer.append(options.fn());
            return buffer;
        }
        final String param = options.param(0);
        String extension = getPreffix() + param;

        if (!getBooleanValue(vendor, extension)) {
            buffer.append(options.fn());
        } else {
            buffer.append(options.inverse());
        }
        return buffer;
    }
}