+++ /dev/null
-package org.apache.lucene.store;
-
-/**
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You 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.
- */
-
-import java.io.IOException;
-import java.util.Map;
-
-import org.apache.lucene.util.BytesRef;
-import org.apache.lucene.util.UnicodeUtil;
-
-/**
- * Abstract base class for performing write operations of Lucene's low-level
- * data types.
- */
-public abstract class DataOutput {
-
- /** Writes a single byte.
- * @see IndexInput#readByte()
- */
- public abstract void writeByte(byte b) throws IOException;
-
- /** Writes an array of bytes.
- * @param b the bytes to write
- * @param length the number of bytes to write
- * @see DataInput#readBytes(byte[],int,int)
- */
- public void writeBytes(byte[] b, int length) throws IOException {
- writeBytes(b, 0, length);
- }
-
- /** Writes an array of bytes.
- * @param b the bytes to write
- * @param offset the offset in the byte array
- * @param length the number of bytes to write
- * @see DataInput#readBytes(byte[],int,int)
- */
- public abstract void writeBytes(byte[] b, int offset, int length) throws IOException;
-
- /** Writes an int as four bytes.
- * @see DataInput#readInt()
- */
- public void writeInt(int i) throws IOException {
- writeByte((byte)(i >> 24));
- writeByte((byte)(i >> 16));
- writeByte((byte)(i >> 8));
- writeByte((byte) i);
- }
-
- /** Writes an int in a variable-length format. Writes between one and
- * five bytes. Smaller values take fewer bytes. Negative numbers are not
- * supported.
- * @see DataInput#readVInt()
- */
- public final void writeVInt(int i) throws IOException {
- while ((i & ~0x7F) != 0) {
- writeByte((byte)((i & 0x7f) | 0x80));
- i >>>= 7;
- }
- writeByte((byte)i);
- }
-
- /** Writes a long as eight bytes.
- * @see DataInput#readLong()
- */
- public void writeLong(long i) throws IOException {
- writeInt((int) (i >> 32));
- writeInt((int) i);
- }
-
- /** Writes an long in a variable-length format. Writes between one and nine
- * bytes. Smaller values take fewer bytes. Negative numbers are not
- * supported.
- * @see DataInput#readVLong()
- */
- public final void writeVLong(long i) throws IOException {
- while ((i & ~0x7F) != 0) {
- writeByte((byte)((i & 0x7f) | 0x80));
- i >>>= 7;
- }
- writeByte((byte)i);
- }
-
- /** Writes a string.
- * @see DataInput#readString()
- */
- public void writeString(String s) throws IOException {
- final BytesRef utf8Result = new BytesRef(10);
- UnicodeUtil.UTF16toUTF8(s, 0, s.length(), utf8Result);
- writeVInt(utf8Result.length);
- writeBytes(utf8Result.bytes, 0, utf8Result.length);
- }
-
- private static int COPY_BUFFER_SIZE = 16384;
- private byte[] copyBuffer;
-
- /** Copy numBytes bytes from input to ourself. */
- public void copyBytes(DataInput input, long numBytes) throws IOException {
- assert numBytes >= 0: "numBytes=" + numBytes;
- long left = numBytes;
- if (copyBuffer == null)
- copyBuffer = new byte[COPY_BUFFER_SIZE];
- while(left > 0) {
- final int toCopy;
- if (left > COPY_BUFFER_SIZE)
- toCopy = COPY_BUFFER_SIZE;
- else
- toCopy = (int) left;
- input.readBytes(copyBuffer, 0, toCopy);
- writeBytes(copyBuffer, 0, toCopy);
- left -= toCopy;
- }
- }
-
- /** Writes a sub sequence of characters from s as the old
- * format (modified UTF-8 encoded bytes).
- * @param s the source of the characters
- * @param start the first character in the sequence
- * @param length the number of characters in the sequence
- * @deprecated -- please pre-convert to utf8 bytes
- * instead or use {@link #writeString}
- */
- @Deprecated
- public void writeChars(String s, int start, int length)
- throws IOException {
- final int end = start + length;
- for (int i = start; i < end; i++) {
- final int code = s.charAt(i);
- if (code >= 0x01 && code <= 0x7F)
- writeByte((byte)code);
- else if (((code >= 0x80) && (code <= 0x7FF)) || code == 0) {
- writeByte((byte)(0xC0 | (code >> 6)));
- writeByte((byte)(0x80 | (code & 0x3F)));
- } else {
- writeByte((byte)(0xE0 | (code >>> 12)));
- writeByte((byte)(0x80 | ((code >> 6) & 0x3F)));
- writeByte((byte)(0x80 | (code & 0x3F)));
- }
- }
- }
-
- /** Writes a sub sequence of characters from char[] as
- * the old format (modified UTF-8 encoded bytes).
- * @param s the source of the characters
- * @param start the first character in the sequence
- * @param length the number of characters in the sequence
- * @deprecated -- please pre-convert to utf8 bytes instead or use {@link #writeString}
- */
- @Deprecated
- public void writeChars(char[] s, int start, int length)
- throws IOException {
- final int end = start + length;
- for (int i = start; i < end; i++) {
- final int code = s[i];
- if (code >= 0x01 && code <= 0x7F)
- writeByte((byte)code);
- else if (((code >= 0x80) && (code <= 0x7FF)) || code == 0) {
- writeByte((byte)(0xC0 | (code >> 6)));
- writeByte((byte)(0x80 | (code & 0x3F)));
- } else {
- writeByte((byte)(0xE0 | (code >>> 12)));
- writeByte((byte)(0x80 | ((code >> 6) & 0x3F)));
- writeByte((byte)(0x80 | (code & 0x3F)));
- }
- }
- }
-
- public void writeStringStringMap(Map<String,String> map) throws IOException {
- if (map == null) {
- writeInt(0);
- } else {
- writeInt(map.size());
- for(final Map.Entry<String, String> entry: map.entrySet()) {
- writeString(entry.getKey());
- writeString(entry.getValue());
- }
- }
- }
-}
fnp / pylucene.git / blobdiff