Language.java

package org.solovyev.android.calculator.language;

import android.content.Context;
import android.support.annotation.NonNull;
import android.text.TextUtils;
import org.solovyev.android.calculator.R;
import org.solovyev.android.calculator.preferences.PreferenceEntry;

import javax.annotation.Nonnull;
import java.util.Locale;

public final class Language implements PreferenceEntry{
    @Nonnull
    public final String code;

    @Nonnull
    public final Locale locale;

    @Nonnull
    final String name;

    public Language(@Nonnull String code, @Nonnull Locale locale) {
        this.code = code;
        this.locale = locale;
        this.name = makeName(code, locale);
    }

    @Nonnull
    private static String makeName(@Nonnull String code, @Nonnull Locale locale) {
        if (code.equals(Languages.SYSTEM_LANGUAGE_CODE)) {
            return "";
        }

        final int underscore = code.indexOf("_");
        if (underscore >= 0 && TextUtils.isEmpty(locale.getDisplayCountry(locale))) {
            return locale.getDisplayName(locale) + " (" + code.substring(underscore + 1) + ")";
        }

        return locale.getDisplayName(locale);
    }

    @Override
    @Nonnull
    public String getName(@Nonnull Context context) {
        if (!isSystem()) {
            return name;
        } else {
            return context.getString(R.string.cpp_system_language) + " (" + locale.getDisplayLanguage(locale) + ")";
        }
    }

    @NonNull
    @Override
    public CharSequence getId() {
        return code;
    }

    public boolean isSystem() {
        return code.equals(Languages.SYSTEM_LANGUAGE_CODE);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        final Language language = (Language) o;
        return code.equals(language.code);

    }

    @Override
    public int hashCode() {
        return code.hashCode();
    }
}