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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.text;
import java.nio.ByteBuffer;
/**
* @author baldersheim
*/
public abstract class AbstractUtf8Array implements Comparable<AbstractUtf8Array> {
/** Writes the utf8 sequence to the given target. */
final public void writeTo(ByteBuffer target) {
target.put(getBytes(), getByteOffset(), getByteLength());
}
/** Returns the byte at the given position. */
public byte getByte(int index) { return getBytes()[getByteOffset() + index]; }
/** Returns the length in bytes of the utf8 sequence. */
public abstract int getByteLength();
/** Wraps the utf8 sequence in a ByteBuffer
*
* @return the wrapping buffer
*/
public ByteBuffer wrap() { return ByteBuffer.wrap(getBytes(), getByteOffset(), getByteLength()); }
/** Returns the backing byte array. */
protected abstract byte [] getBytes();
public boolean isEmpty() { return getByteLength() == 0; }
/** Returns the offset in the backing array where the utf8 sequence starts. */
protected abstract int getByteOffset();
@Override
public int hashCode() {
final int l = getByteLength();
final int c = getByteOffset();
final byte [] b = getBytes();
int h = 0;
for (int i=0; i < l; i++) {
int v = b[c+i];
h ^= v << ((i%4)*8);
}
return h;
}
@Override
public boolean equals(Object o) {
if (o instanceof AbstractUtf8Array) {
AbstractUtf8Array other = (AbstractUtf8Array)o;
return compareTo(other) == 0;
} else if (o instanceof String) {
return toString().equals(o);
}
return false;
}
/** Retuerns the utf8 sequence as a Java string. */
@Override
public String toString() {
return Utf8.toString(getBytes(), getByteOffset(), getByteLength());
}
@Override
public int compareTo(AbstractUtf8Array rhs) {
final int l = getByteLength();
final int rl = rhs.getByteLength();
if (l < rl) {
return -1;
} else if (l > rl) {
return 1;
} else {
final byte [] b = getBytes();
final byte [] rb = rhs.getBytes();
final int c = getByteOffset();
final int rc = rhs.getByteOffset();
for (int i=0; i < l; i++) {
if (b[c+i] < rb[rc+i]) {
return -1;
} else if (b[c+i] > rb[rc+i]) {
return 1;
}
}
return 0;
}
}
public Utf8Array ascii7BitLowerCase() {
byte [] upper = new byte[getByteLength()];
for (int i=0; i< upper.length; i++ ) {
byte b = getByte(i);
if ((b >= 0x41) && (b < (0x41+26))) {
b |= 0x20; // Lowercase
}
upper[i] = b;
}
return new Utf8Array(upper);
}
}
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