diff options
Diffstat (limited to 'java/src/main/java/com/google/protobuf/nano/FieldData.java')
| -rw-r--r-- | java/src/main/java/com/google/protobuf/nano/FieldData.java | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/java/src/main/java/com/google/protobuf/nano/FieldData.java b/java/src/main/java/com/google/protobuf/nano/FieldData.java new file mode 100644 index 0000000..7a5eb4c --- /dev/null +++ b/java/src/main/java/com/google/protobuf/nano/FieldData.java @@ -0,0 +1,173 @@ +// Protocol Buffers - Google's data interchange format +// Copyright 2014 Google Inc. All rights reserved. +// http://code.google.com/p/protobuf/ +// +// 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.nano; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.List; + +/** + * Stores unknown fields. These might be extensions or fields that the generated API doesn't + * know about yet. + */ +class FieldData { + private Extension<?, ?> cachedExtension; + private Object value; + /** The serialised values for this object. Will be cleared if getValue is called */ + private List<UnknownFieldData> unknownFieldData; + + <T> FieldData(Extension<?, T> extension, T newValue) { + cachedExtension = extension; + value = newValue; + } + + FieldData() { + unknownFieldData = new ArrayList<UnknownFieldData>(); + } + + void addUnknownField(UnknownFieldData unknownField) { + unknownFieldData.add(unknownField); + } + + <T> T getValue(Extension<?, T> extension) { + if (value != null){ + if (cachedExtension != extension) { // Extension objects are singletons. + throw new IllegalStateException( + "Tried to getExtension with a differernt Extension."); + } + } else { + cachedExtension = extension; + value = extension.getValueFrom(unknownFieldData); + unknownFieldData = null; + } + return (T) value; + } + + <T> void setValue(Extension<?, T> extension, T newValue) { + cachedExtension = extension; + value = newValue; + unknownFieldData = null; + } + + int computeSerializedSize() { + int size = 0; + if (value != null) { + size = cachedExtension.computeSerializedSize(value); + } else { + for (UnknownFieldData unknownField : unknownFieldData) { + size += unknownField.computeSerializedSize(); + } + } + return size; + } + + void writeTo(CodedOutputByteBufferNano output) throws IOException { + if (value != null) { + cachedExtension.writeTo(value, output); + } else { + for (UnknownFieldData unknownField : unknownFieldData) { + unknownField.writeTo(output); + } + } + } + + @Override + public boolean equals(Object o) { + if (o == this) { + return true; + } + if (!(o instanceof FieldData)) { + return false; + } + + FieldData other = (FieldData) o; + if (value != null && other.value != null) { + // If both objects have deserialized values, compare those. + // Since unknown fields are only compared if messages have generated equals methods + // we know this will be a meaningful comparison (not identity) for all values. + if (cachedExtension != other.cachedExtension) { // Extension objects are singletons. + return false; + } + if (!cachedExtension.clazz.isArray()) { + // Can't test (!cachedExtension.repeated) due to 'bytes' -> 'byte[]' + return value.equals(other.value); + } + if (value instanceof byte[]) { + return Arrays.equals((byte[]) value, (byte[]) other.value); + } else if (value instanceof int[]) { + return Arrays.equals((int[]) value, (int[]) other.value); + } else if (value instanceof long[]) { + return Arrays.equals((long[]) value, (long[]) other.value); + } else if (value instanceof float[]) { + return Arrays.equals((float[]) value, (float[]) other.value); + } else if (value instanceof double[]) { + return Arrays.equals((double[]) value, (double[]) other.value); + } else if (value instanceof boolean[]) { + return Arrays.equals((boolean[]) value, (boolean[]) other.value); + } else { + return Arrays.deepEquals((Object[]) value, (Object[]) other.value); + } + } + if (unknownFieldData != null && other.unknownFieldData != null) { + // If both objects have byte arrays compare those directly. + return unknownFieldData.equals(other.unknownFieldData); + } + try { + // As a last resort, serialize and compare the resulting byte arrays. + return Arrays.equals(toByteArray(), other.toByteArray()); + } catch (IOException e) { + // Should not happen. + throw new IllegalStateException(e); + } + } + + @Override + public int hashCode() { + int result = 17; + try { + // The only way to generate a consistent hash is to use the serialized form. + result = 31 * result + Arrays.hashCode(toByteArray()); + } catch (IOException e) { + // Should not happen. + throw new IllegalStateException(e); + } + return result; + } + + private byte[] toByteArray() throws IOException { + byte[] result = new byte[computeSerializedSize()]; + CodedOutputByteBufferNano output = CodedOutputByteBufferNano.newInstance(result); + writeTo(output); + return result; + } + +} |