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/*
 * Copyright 2016 The gRPC Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.grpc;

import com.google.common.io.BaseEncoding;
import io.grpc.Metadata.AsciiMarshaller;
import io.grpc.Metadata.BinaryStreamMarshaller;
import java.io.InputStream;
import java.nio.charset.Charset;

/**
 * Internal {@link Metadata} accessor. This is intended for use by io.grpc.internal, and the
 * specifically supported transport packages. If you *really* think you need to use this, contact
 * the gRPC team first.
 */
@Internal
public final class InternalMetadata {

  /**
   * A specialized plain ASCII marshaller. Both input and output are assumed to be valid header
   * ASCII.
   *
   * 

Extended here to break the dependency. */ @Internal public interface TrustedAsciiMarshaller extends Metadata.TrustedAsciiMarshaller {} /** * Copy of StandardCharsets, which is only available on Java 1.7 and above. */ @Internal public static final Charset US_ASCII = Charset.forName("US-ASCII"); /** * An instance of base64 encoder that omits padding. */ @Internal public static final BaseEncoding BASE64_ENCODING_OMIT_PADDING = Metadata.BASE64_ENCODING_OMIT_PADDING; @Internal public static Metadata.Key keyOf(String name, TrustedAsciiMarshaller marshaller) { boolean isPseudo = name != null && !name.isEmpty() && name.charAt(0) == ':'; return Metadata.Key.of(name, isPseudo, marshaller); } @Internal public static Metadata.Key keyOf(String name, AsciiMarshaller marshaller) { boolean isPseudo = name != null && !name.isEmpty() && name.charAt(0) == ':'; return Metadata.Key.of(name, isPseudo, marshaller); } @Internal public static Metadata newMetadata(byte[]... binaryValues) { return new Metadata(binaryValues); } @Internal public static Metadata newMetadata(int usedNames, byte[]... binaryValues) { return new Metadata(usedNames, binaryValues); } @Internal public static byte[][] serialize(Metadata md) { return md.serialize(); } @Internal public static int headerCount(Metadata md) { return md.headerCount(); } /** * Serializes all metadata entries, leaving some values as {@link InputStream}s. * *

Produces serialized names and values interleaved. result[i*2] are names, while * result[i*2+1] are values. * *

Names are byte arrays as described according to the {@link Metadata#serialize} * method. Values are either byte arrays or {@link InputStream}s. */ @Internal public static Object[] serializePartial(Metadata md) { return md.serializePartial(); } /** * Creates a holder for a pre-parsed value read by the transport. * * @param marshaller The {@link Metadata.BinaryStreamMarshaller} associated with this value. * @param value The value to store. * @return an object holding the pre-parsed value for this key. */ @Internal public static Object parsedValue(BinaryStreamMarshaller marshaller, T value) { return new Metadata.LazyValue<>(marshaller, value); } /** * Creates a new {@link Metadata} instance from serialized data, * with some values pre-parsed. Metadata will mutate the passed in array. * * @param usedNames The number of names used. * @param namesAndValues An array of interleaved names and values, * with each name (at even indices) represented as a byte array, * and each value (at odd indices) represented as either a byte * array or an object returned by the {@link #parsedValue} * method. */ @Internal public static Metadata newMetadataWithParsedValues(int usedNames, Object[] namesAndValues) { return new Metadata(usedNames, namesAndValues); } }





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