com.github.subalakr.yasjl.JsonNullByteBufProcessor.java Source code

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Here is the source code for com.github.subalakr.yasjl.JsonNullByteBufProcessor.java

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/*
 * Copyright (c) 2017 Couchbase, Inc.
 *
 * 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 com.github.subalakr.yasjl;

import io.netty.buffer.ByteBufProcessor;

/**
 * Processes JSON null value
 *
 * @author Subhashni Balakrishnan
 */
public class JsonNullByteBufProcessor implements ByteBufProcessor {
    private static final byte N1 = (byte) 'n';
    private static final byte N2 = (byte) 'u';
    private static final byte N3 = (byte) 'l';
    private byte lastValue;

    public JsonNullByteBufProcessor() {
        this.lastValue = N1;
    }

    public void reset() {
        this.lastValue = N1;
    }

    public boolean process(byte value) throws Exception {
        switch (value) {
        case N2:
            if (this.lastValue == N1) {
                this.lastValue = N2;
                return true;
            }
            break;
        case N3:
            if (this.lastValue == N2) {
                this.lastValue = N3;
                return true;
            } else if (this.lastValue == N3) {
                return false;
            }
            break;
        }
        throw new IllegalStateException("Invalid json");
    }
}