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package org.mozilla.tv.firefox.utils;
import android.content.Context;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RawRes;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.Map;
public class HtmlLoader {
/**
* Load a given (html or css) resource file into a String. The input can contain tokens that will
* be replaced with localised strings.
*
* @param substitutionTable A table of substitions, e.g. %shortMessage% -> "Error loading page..."
* Can be null, in which case no substitutions will be made.
* @return The file content, with all substitutions having being made.
*/
public static String loadResourceFile(@NonNull final Context context,
@NonNull final @RawRes int resourceID,
@Nullable final Map<String, String> substitutionTable) {
try (final BufferedReader fileReader =
new BufferedReader(new InputStreamReader(context.getResources().openRawResource(resourceID), StandardCharsets.UTF_8))) {
final StringBuilder outputBuffer = new StringBuilder();
String line;
while ((line = fileReader.readLine()) != null) {
if (substitutionTable != null) {
for (final Map.Entry<String, String> entry : substitutionTable.entrySet()) {
line = line.replace(entry.getKey(), entry.getValue());
}
}
outputBuffer.append(line);
}
return outputBuffer.toString();
} catch (final IOException e) {
throw new IllegalStateException("Unable to load error page data", e);
}
}
}