com.github.spjoe.getter.GetterResult Maven / Gradle / Ivy

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A library which provides caching for annotation on getters of java bean properties. It also creates byte code (via reflectAsm) to call getter and setter of the annotated java bean property

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/*
    Copyright 2016 Camillo Dell'mour

    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.spjoe.getter;

import java.util.function.Supplier;

public final class GetterResult {
    private static final GetterResult NO_GETTER_RESULT = new GetterResult(null, false, null);
    private final T result;
    private final boolean getterExist;
    private final Throwable invocationException;

    private GetterResult(final T result, final boolean getterExist, final Throwable invocationException) {
        this.result = result;
        this.getterExist = getterExist;
        this.invocationException = invocationException;
    }

    public boolean doesGetterExist() {
        return getterExist;
    }

    public boolean isSuccess() {
        return getterExist && invocationException == null;
    }

    public T orElse(final T defaultValue) {
        return orElseGet(() -> defaultValue);
    }

    public T orElseGet(final Supplier defaultSupplier) {
        return isSuccess() ? result : defaultSupplier.get();
    }

    public  T orElseThrow(final Supplier throwableSupplier) throws X {
        if (isSuccess()) {
            return result;
        } else {
            throw throwableSupplier.get();
        }
    }

    public T get() {
        return orElseThrow(() -> !getterExist
                ? new IllegalStateException("no getter exist to get a result")
                : new IllegalStateException("invocation of getter failed", invocationException));
    }

    static  GetterResult noGetter() {
        return NO_GETTER_RESULT;
    }

    static  GetterResult failed(final Throwable throwable) {
        return new GetterResult<>(null, true, throwable);
    }

    static  GetterResult success(final T result) {
        return new GetterResult<>(result, true, null);
    }
}