diff options
Diffstat (limited to 'third_party/protobuf/3.4.0/java/core/src/main/java/com/google/protobuf/ExtensionRegistryLite.java')
-rw-r--r-- | third_party/protobuf/3.4.0/java/core/src/main/java/com/google/protobuf/ExtensionRegistryLite.java | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/third_party/protobuf/3.4.0/java/core/src/main/java/com/google/protobuf/ExtensionRegistryLite.java b/third_party/protobuf/3.4.0/java/core/src/main/java/com/google/protobuf/ExtensionRegistryLite.java new file mode 100644 index 0000000000..f3d48d3af3 --- /dev/null +++ b/third_party/protobuf/3.4.0/java/core/src/main/java/com/google/protobuf/ExtensionRegistryLite.java @@ -0,0 +1,227 @@ +// Protocol Buffers - Google's data interchange format +// Copyright 2008 Google Inc. All rights reserved. +// https://developers.google.com/protocol-buffers/ +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +package com.google.protobuf; + +import java.util.Collections; +import java.util.HashMap; +import java.util.Map; + +/** + * Equivalent to {@link ExtensionRegistry} but supports only "lite" types. + * <p> + * If all of your types are lite types, then you only need to use + * {@code ExtensionRegistryLite}. Similarly, if all your types are regular + * types, then you only need {@link ExtensionRegistry}. Typically it does not + * make sense to mix the two, since if you have any regular types in your + * program, you then require the full runtime and lose all the benefits of + * the lite runtime, so you might as well make all your types be regular types. + * However, in some cases (e.g. when depending on multiple third-party libraries + * where one uses lite types and one uses regular), you may find yourself + * wanting to mix the two. In this case things get more complicated. + * <p> + * There are three factors to consider: Whether the type being extended is + * lite, whether the embedded type (in the case of a message-typed extension) + * is lite, and whether the extension itself is lite. Since all three are + * declared in different files, they could all be different. Here are all + * the combinations and which type of registry to use: + * <pre> + * Extended type Inner type Extension Use registry + * ======================================================================= + * lite lite lite ExtensionRegistryLite + * lite regular lite ExtensionRegistry + * regular regular regular ExtensionRegistry + * all other combinations not supported + * </pre> + * <p> + * Note that just as regular types are not allowed to contain lite-type fields, + * they are also not allowed to contain lite-type extensions. This is because + * regular types must be fully accessible via reflection, which in turn means + * that all the inner messages must also support reflection. On the other hand, + * since regular types implement the entire lite interface, there is no problem + * with embedding regular types inside lite types. + * + * @author kenton@google.com Kenton Varda + */ +public class ExtensionRegistryLite { + + // Set true to enable lazy parsing feature for MessageSet. + // + // TODO(xiangl): Now we use a global flag to control whether enable lazy + // parsing feature for MessageSet, which may be too crude for some + // applications. Need to support this feature on smaller granularity. + private static volatile boolean eagerlyParseMessageSets = false; + + // Visible for testing. + static final String EXTENSION_CLASS_NAME = "com.google.protobuf.Extension"; + + /* @Nullable */ + static Class<?> resolveExtensionClass() { + try { + return Class.forName(EXTENSION_CLASS_NAME); + } catch (ClassNotFoundException e) { + // See comment in ExtensionRegistryFactory on the potential expense of this. + return null; + } + } + + /* @Nullable */ + private static final Class<?> extensionClass = resolveExtensionClass(); + + public static boolean isEagerlyParseMessageSets() { + return eagerlyParseMessageSets; + } + + public static void setEagerlyParseMessageSets(boolean isEagerlyParse) { + eagerlyParseMessageSets = isEagerlyParse; + } + + /** + * Construct a new, empty instance. + * + * <p>This may be an {@code ExtensionRegistry} if the full (non-Lite) proto libraries are + * available. + */ + public static ExtensionRegistryLite newInstance() { + return ExtensionRegistryFactory.create(); + } + + /** + * Get the unmodifiable singleton empty instance of either ExtensionRegistryLite or + * {@code ExtensionRegistry} (if the full (non-Lite) proto libraries are available). + */ + public static ExtensionRegistryLite getEmptyRegistry() { + return ExtensionRegistryFactory.createEmpty(); + } + + + /** Returns an unmodifiable view of the registry. */ + public ExtensionRegistryLite getUnmodifiable() { + return new ExtensionRegistryLite(this); + } + + /** + * Find an extension by containing type and field number. + * + * @return Information about the extension if found, or {@code null} + * otherwise. + */ + @SuppressWarnings("unchecked") + public <ContainingType extends MessageLite> + GeneratedMessageLite.GeneratedExtension<ContainingType, ?> + findLiteExtensionByNumber( + final ContainingType containingTypeDefaultInstance, + final int fieldNumber) { + return (GeneratedMessageLite.GeneratedExtension<ContainingType, ?>) + extensionsByNumber.get( + new ObjectIntPair(containingTypeDefaultInstance, fieldNumber)); + } + + /** Add an extension from a lite generated file to the registry. */ + public final void add( + final GeneratedMessageLite.GeneratedExtension<?, ?> extension) { + extensionsByNumber.put( + new ObjectIntPair(extension.getContainingTypeDefaultInstance(), + extension.getNumber()), + extension); + } + + /** + * Add an extension from a lite generated file to the registry only if it is + * a non-lite extension i.e. {@link GeneratedMessageLite.GeneratedExtension}. */ + public final void add(ExtensionLite<?, ?> extension) { + if (GeneratedMessageLite.GeneratedExtension.class.isAssignableFrom(extension.getClass())) { + add((GeneratedMessageLite.GeneratedExtension<?, ?>) extension); + } + if (ExtensionRegistryFactory.isFullRegistry(this)) { + try { + this.getClass().getMethod("add", extensionClass).invoke(this, extension); + } catch (Exception e) { + throw new IllegalArgumentException( + String.format("Could not invoke ExtensionRegistry#add for %s", extension), e); + } + } + } + + // ================================================================= + // Private stuff. + + // Constructors are package-private so that ExtensionRegistry can subclass + // this. + + ExtensionRegistryLite() { + this.extensionsByNumber = + new HashMap<ObjectIntPair, + GeneratedMessageLite.GeneratedExtension<?, ?>>(); + } + static final ExtensionRegistryLite EMPTY_REGISTRY_LITE = + new ExtensionRegistryLite(true); + + ExtensionRegistryLite(ExtensionRegistryLite other) { + if (other == EMPTY_REGISTRY_LITE) { + this.extensionsByNumber = Collections.emptyMap(); + } else { + this.extensionsByNumber = + Collections.unmodifiableMap(other.extensionsByNumber); + } + } + + private final Map<ObjectIntPair, + GeneratedMessageLite.GeneratedExtension<?, ?>> + extensionsByNumber; + + ExtensionRegistryLite(boolean empty) { + this.extensionsByNumber = Collections.emptyMap(); + } + + /** A (Object, int) pair, used as a map key. */ + private static final class ObjectIntPair { + private final Object object; + private final int number; + + ObjectIntPair(final Object object, final int number) { + this.object = object; + this.number = number; + } + + @Override + public int hashCode() { + return System.identityHashCode(object) * ((1 << 16) - 1) + number; + } + @Override + public boolean equals(final Object obj) { + if (!(obj instanceof ObjectIntPair)) { + return false; + } + final ObjectIntPair other = (ObjectIntPair)obj; + return object == other.object && number == other.number; + } + } +} |