io.netty.handler.codec.DecoderResult Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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:
 *
 *   https://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.netty.handler.codec;

import io.netty.util.Signal;
import io.netty.util.internal.ObjectUtil;

public class DecoderResult {

    protected static final Signal SIGNAL_UNFINISHED = Signal.valueOf(DecoderResult.class, "UNFINISHED");
    protected static final Signal SIGNAL_SUCCESS = Signal.valueOf(DecoderResult.class, "SUCCESS");

    public static final DecoderResult UNFINISHED = new DecoderResult(SIGNAL_UNFINISHED);
    public static final DecoderResult SUCCESS = new DecoderResult(SIGNAL_SUCCESS);

    public static DecoderResult failure(Throwable cause) {
        return new DecoderResult(ObjectUtil.checkNotNull(cause, "cause"));
    }

    private final Throwable cause;

    protected DecoderResult(Throwable cause) {
        this.cause = ObjectUtil.checkNotNull(cause, "cause");
    }

    public boolean isFinished() {
        return cause != SIGNAL_UNFINISHED;
    }

    public boolean isSuccess() {
        return cause == SIGNAL_SUCCESS;
    }

    public boolean isFailure() {
        return cause != SIGNAL_SUCCESS && cause != SIGNAL_UNFINISHED;
    }

    public Throwable cause() {
        if (isFailure()) {
            return cause;
        } else {
            return null;
        }
    }

    @Override
    public String toString() {
        if (isFinished()) {
            if (isSuccess()) {
                return "success";
            }

            String cause = cause().toString();
            return new StringBuilder(cause.length() + 17)
                .append("failure(")
                .append(cause)
                .append(')')
                .toString();
        } else {
            return "unfinished";
        }
    }
}