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Java example source code file (DecoderResult.java)

This example Java source code file (DecoderResult.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

decoderresult, nullpointerexception, override, signal, signal_success, signal_unfinished, string, throwable

The DecoderResult.java Java example source code

/*
 * 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:
 *
 *   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.netty.handler.codec;

import io.netty.util.Signal;

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) {
        if (cause == null) {
            throw new NullPointerException("cause");
        }
        return new DecoderResult(cause);
    }

    private final Throwable cause;

    protected DecoderResult(Throwable cause) {
        if (cause == null) {
            throw new NullPointerException("cause");
        }
        this.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";
        }
    }
}

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