ReadOnlyHttpHeaders Class — netty Architecture

Source Code

codec-http/src/main/java/io/netty/handler/codec/http/ReadOnlyHttpHeaders.java lines 44–459

@UnstableApi
public final class ReadOnlyHttpHeaders extends HttpHeaders {
    private final CharSequence[] nameValuePairs;

    /**
     * Create a new instance.
     * @param validateHeaders {@code true} to validate the contents of each header name.
     * @param nameValuePairs An array of the structure {@code [<name,value>,<name,value>,...]}.
     *                      A copy will <strong>NOT</strong> be made of this array. If the contents of this array
     *                      may be modified externally you are responsible for passing in a copy.
     */
    public ReadOnlyHttpHeaders(boolean validateHeaders, CharSequence... nameValuePairs) {
        if ((nameValuePairs.length & 1) != 0) {
            throw newInvalidArraySizeException();
        }
        if (validateHeaders) {
            validateHeaders(nameValuePairs);
        }
        this.nameValuePairs = nameValuePairs;
    }

    private static IllegalArgumentException newInvalidArraySizeException() {
        return new IllegalArgumentException("nameValuePairs must be arrays of [name, value] pairs");
    }

    private static void validateHeaders(CharSequence... keyValuePairs) {
        for (int i = 0; i < keyValuePairs.length; i += 2) {
            DefaultHttpHeadersFactory.headersFactory().getNameValidator().validateName(keyValuePairs[i]);
        }
    }

    private CharSequence get0(CharSequence name) {
        final int nameHash = AsciiString.hashCode(name);
        for (int i = 0; i < nameValuePairs.length; i += 2) {
            CharSequence roName = nameValuePairs[i];
            if (AsciiString.hashCode(roName) == nameHash && contentEqualsIgnoreCase(roName, name)) {
                // Suppress a warning out of bounds access since the constructor allows only pairs
                return nameValuePairs[i + 1];
            }
        }
        return null;
    }

    @Override
    public String get(String name) {
        CharSequence value = get0(name);
        return value == null ? null : value.toString();
    }

    @Override
    public Integer getInt(CharSequence name) {
        CharSequence value = get0(name);
        return value == null ? null : INSTANCE.convertToInt(value);
    }

    @Override
    public int getInt(CharSequence name, int defaultValue) {
        CharSequence value = get0(name);
        return value == null ? defaultValue : INSTANCE.convertToInt(value);
    }

    @Override
    public Short getShort(CharSequence name) {
        CharSequence value = get0(name);
        return value == null ? null : INSTANCE.convertToShort(value);
    }

    @Override
    public short getShort(CharSequence name, short defaultValue) {
        CharSequence value = get0(name);
        return value == null ? defaultValue : INSTANCE.convertToShort(value);
    }

    @Override
    public Long getTimeMillis(CharSequence name) {
        CharSequence value = get0(name);
        return value == null ? null : INSTANCE.convertToTimeMillis(value);
    }

    @Override
    public long getTimeMillis(CharSequence name, long defaultValue) {