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/**

* Copyright 2016 Netflix, 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 io.reactivex;

import io.reactivex.internal.functions.Objects;

/**

* Container for either a value of type T or a Throwable.

*

* @param <T> the value type

*/

public final class Try<T> {

/** The value. */

final T value;

/** The error or null if this holds a value. */

final Throwable error;

private Try(T value, Throwable error) {

this.value = value;

this.error = error;

}

/**

* Constructs a Try instance by wrapping the given value.

*

* @param <T> the value type

* @param value the value to wrap

* @return the created Try instance

*/

public static <T> Try<T> ofValue(T value) {

// TODO ? Objects.requireNonNull(value);

return new Try<T>(value, null);

}

/**

* Constructs a Try instance by wrapping the given Throwable.

*

* <p>Null Throwables are replaced by NullPointerException instance in this Try.

*

* @param <T> the value type

* @param e the exception to wrap

* @return the new Try instance holding the exception

*/

public static <T> Try<T> ofError(Throwable e) {

return new Try<T>(null, e != null ? e : new NullPointerException());

}

/**

* Returns the value or null if the value is actually null or if this Try holds an error instead.

* @return the value contained

* @see #hasValue()

*/

public T value() {

return value;

}

/**

* Returns the error or null if this Try holds a value instead.

*

* @return the Throwable contained or null

*

*/

public Throwable error() {

return error;

}

/**

* Returns true if this Try holds an error.

* @return true if this Try holds an error

*/

public boolean hasError() {

return error != null;

}

/**

* Returns true if this Try holds a value.

* @return true if this Try holds a value

*/

public boolean hasValue() {

return error == null;

}

@Override

public boolean equals(Object other) {

if (other instanceof Try) {

Try<?> o = (Try<?>) other;

return Objects.equals(value, o.value)

&& Objects.equals(error, o.error);

}

return false;

}

@Override

public int hashCode() {

return Objects.hashCode(value) + Objects.hashCode(error);

}

@Override

public String toString() {

if (error != null) {

return "Try[ " + error + " ]";

}

return "Try[" + value + "]";

}

}