io.datty.msgpack.core.reader.ShortReader.java Source code

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Here is the source code for io.datty.msgpack.core.reader.ShortReader.java

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/*
 * Copyright (C) 2016 Datty.io Authors
 *
 * Licensed 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 io.datty.msgpack.core.reader;

import org.msgpack.core.MessagePack.Code;

import io.datty.msgpack.core.AbstractMessageReader;
import io.datty.msgpack.support.MessageNumberOverflowException;
import io.datty.msgpack.support.MessageParseException;
import io.netty.buffer.ByteBuf;

/**
 * ShortReader
 * 
 * @author Alex Shvid
 *
 */

public class ShortReader extends AbstractMessageReader implements ValueReader<Short> {

    public static final ShortReader INSTANCE = new ShortReader();

    @Override
    public Short read(ByteBuf buffer, boolean copy) {

        if (!hasNext(buffer)) {
            return null;
        }

        byte b = readByte(buffer);

        if (Code.isFixInt(b)) {
            return (short) b;
        }

        if (Code.isFixedRaw(b)) { // FixRaw
            return parseShort(readString(b, buffer));
        }

        switch (b) {

        case Code.NIL:
            return null;

        case Code.FALSE:
            return 0;

        case Code.TRUE:
            return 1;

        case Code.UINT8:
            return (short) readUnsignedByte(buffer);
        case Code.UINT16:
            int u16 = readUnsignedShort(buffer);
            if (u16 > (int) Short.MAX_VALUE) {
                throw new MessageNumberOverflowException(u16);
            }
            return (short) u16;
        case Code.UINT32:
            long u32 = readUnsignedInt(buffer);
            if (u32 > (long) Short.MAX_VALUE) {
                throw new MessageNumberOverflowException(u32);
            }
            return (short) u32;
        case Code.UINT64:
            long u64 = readUnsignedLong(buffer);
            if (u64 > (long) Short.MAX_VALUE) {
                throw new MessageNumberOverflowException(u64);
            }
            return (short) u64;
        case Code.INT8:
            return (short) readByte(buffer);
        case Code.INT16:
            return readShort(buffer);
        case Code.INT32:
            int i32 = readInt(buffer);
            if (i32 < (int) Short.MIN_VALUE || i32 > (int) Short.MAX_VALUE) {
                throw new MessageNumberOverflowException(i32);
            }
            return (short) i32;
        case Code.INT64:
            long i64 = readLong(buffer);
            if (i64 < (long) Short.MIN_VALUE || i64 > (long) Short.MAX_VALUE) {
                throw new MessageNumberOverflowException(i64);
            }
            return (short) i64;

        case Code.FLOAT32:
            return (short) readFloat(buffer);
        case Code.FLOAT64:
            return (short) readDouble(buffer);

        case Code.STR8:
        case Code.STR16:
        case Code.STR32:
            return parseShort(readString(b, buffer));

        case Code.BIN8:
        case Code.BIN16:
        case Code.BIN32:
            return parseShort(readAsciiString(b, buffer));

        default:
            buffer.readerIndex(buffer.readerIndex() - 1);
            skipValue(buffer);
            return null;
        }

    }

    private Short parseShort(String str) {
        try {
            return Short.parseShort(str);
        } catch (NumberFormatException e) {
            throw new MessageParseException("invalid short: " + str, e);
        }
    }

}