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/*
* 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;
import java.util.Arrays;
/**
* 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 capacity 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 ref 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(Arrays.copyOf(ref.bytes, ref.length));
}
@Override
public boolean equals(Object obj) {
throw new UnsupportedOperationException();
}
@Override
public int hashCode() {
throw new UnsupportedOperationException();
}
}
