/*
* Copyright (C) 2012, 2016 higherfrequencytrading.com
* Copyright (C) 2016 Roman Leventov
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package net.openhft.chronicle.hash.serialization.impl;
import net.openhft.chronicle.bytes.Bytes;
import net.openhft.chronicle.hash.serialization.BytesReader;
import net.openhft.chronicle.hash.serialization.ListMarshaller;
import net.openhft.chronicle.hash.serialization.SetMarshaller;
import net.openhft.chronicle.hash.serialization.StatefulCopyable;
import net.openhft.chronicle.wire.WireIn;
import net.openhft.chronicle.wire.WireOut;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* {@link BytesReader} implementation for String, for the primary ChronicleMap's key or value type
* {@link StringSizedReader} + {@link StringUtf8DataAccess} are more efficient (because don't
* store the size twice), so this reader is useful in conjunction with {@link ListMarshaller} or
* {@link SetMarshaller}.
*
* @see CharSequenceBytesWriter
*/
public class StringBytesReader implements BytesReader<String>, StatefulCopyable<StringBytesReader> {
/** Cache field */
private transient StringBuilder sb;
public StringBytesReader() {
initTransients();
}
private void initTransients() {
sb = new StringBuilder();
}
@NotNull
@Override
public String read(Bytes in, @Nullable String using) {
if (in.readUtf8(sb)) {
return sb.toString();
} else {
throw new NullPointerException("BytesReader couldn't read null");
}
}
@Override
public StringBytesReader copy() {
return new StringBytesReader();
}
@Override
public void readMarshallable(@NotNull WireIn wireIn) {
// no fields to read
initTransients();
}
@Override
public void writeMarshallable(@NotNull WireOut wireOut) {
// no fields to write
}
}