| /* |
| * 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. |
| */ |
| package org.apache.lucene.util; |
| |
| |
| /** |
| * A builder for {@link BytesRef} instances. |
| * @lucene.internal |
| */ |
| public class BytesRefBuilder { |
| |
| private final BytesRef ref; |
| |
| /** Sole constructor. */ |
| public BytesRefBuilder() { |
| ref = new BytesRef(); |
| } |
| |
| /** Return a reference to the bytes of this builder. */ |
| public byte[] bytes() { |
| return ref.bytes; |
| } |
| |
| /** Return the number of bytes in this buffer. */ |
| public int length() { |
| return ref.length; |
| } |
| |
| /** Set the length. */ |
| public void setLength(int length) { |
| this.ref.length = length; |
| } |
| |
| /** Return the byte at the given offset. */ |
| public byte byteAt(int offset) { |
| return ref.bytes[offset]; |
| } |
| |
| /** Set a byte. */ |
| public void setByteAt(int offset, byte b) { |
| ref.bytes[offset] = b; |
| } |
| |
| /** |
| * Ensure that this builder can hold at least <code>capacity</code> bytes |
| * without resizing. |
| */ |
| public void grow(int capacity) { |
| ref.bytes = ArrayUtil.grow(ref.bytes, capacity); |
| } |
| |
| /** |
| * Append a single byte to this builder. |
| */ |
| public void append(byte b) { |
| grow(ref.length + 1); |
| ref.bytes[ref.length++] = b; |
| } |
| |
| /** |
| * Append the provided bytes to this builder. |
| */ |
| public void append(byte[] b, int off, int len) { |
| grow(ref.length + len); |
| System.arraycopy(b, off, ref.bytes, ref.length, len); |
| ref.length += len; |
| } |
| |
| /** |
| * Append the provided bytes to this builder. |
| */ |
| public void append(BytesRef ref) { |
| append(ref.bytes, ref.offset, ref.length); |
| } |
| |
| /** |
| * Append the provided bytes to this builder. |
| */ |
| public void append(BytesRefBuilder builder) { |
| append(builder.get()); |
| } |
| |
| /** |
| * Reset this builder to the empty state. |
| */ |
| public void clear() { |
| setLength(0); |
| } |
| |
| /** |
| * Replace the content of this builder with the provided bytes. Equivalent to |
| * calling {@link #clear()} and then {@link #append(byte[], int, int)}. |
| */ |
| public void copyBytes(byte[] b, int off, int len) { |
| clear(); |
| append(b, off, len); |
| } |
| |
| /** |
| * Replace the content of this builder with the provided bytes. Equivalent to |
| * calling {@link #clear()} and then {@link #append(BytesRef)}. |
| */ |
| public void copyBytes(BytesRef ref) { |
| clear(); |
| append(ref); |
| } |
| |
| /** |
| * Replace the content of this builder with the provided bytes. Equivalent to |
| * calling {@link #clear()} and then {@link #append(BytesRefBuilder)}. |
| */ |
| public void copyBytes(BytesRefBuilder builder) { |
| clear(); |
| append(builder); |
| } |
| |
| /** |
| * Replace the content of this buffer with UTF-8 encoded bytes that would |
| * represent the provided text. |
| */ |
| public void copyChars(CharSequence text) { |
| copyChars(text, 0, text.length()); |
| } |
| |
| /** |
| * Replace the content of this buffer with UTF-8 encoded bytes that would |
| * represent the provided text. |
| */ |
| public void copyChars(CharSequence text, int off, int len) { |
| grow(UnicodeUtil.maxUTF8Length(len)); |
| ref.length = UnicodeUtil.UTF16toUTF8(text, off, len, ref.bytes); |
| } |
| |
| /** |
| * Replace the content of this buffer with UTF-8 encoded bytes that would |
| * represent the provided text. |
| */ |
| public void copyChars(char[] text, int off, int len) { |
| grow(UnicodeUtil.maxUTF8Length(len)); |
| ref.length = UnicodeUtil.UTF16toUTF8(text, off, len, ref.bytes); |
| } |
| |
| /** |
| * Return a {@link BytesRef} that points to the internal content of this |
| * builder. Any update to the content of this builder might invalidate |
| * the provided <code>ref</code> and vice-versa. |
| */ |
| public BytesRef get() { |
| assert ref.offset == 0 : "Modifying the offset of the returned ref is illegal"; |
| return ref; |
| } |
| |
| /** |
| * Build a new {@link BytesRef} that has the same content as this buffer. |
| */ |
| public BytesRef toBytesRef() { |
| return new BytesRef(ArrayUtil.copyOfSubArray(ref.bytes, 0, ref.length)); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public int hashCode() { |
| throw new UnsupportedOperationException(); |
| } |
| } |