/**
* Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information regarding copyright ownership. Apereo
* 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 the
* following location:
*
* <p>http://www.apache.org/licenses/LICENSE-2.0
*
* <p>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 org.apereo.portal.utils.threading;
public final class ReadResult<T> {
private static final ReadResult<Object> READ_RESULT_NO_WRITE_NULL =
new ReadResult<Object>(false);
private static final ReadResult<Object> READ_RESULT_DO_WRITE_NULL =
new ReadResult<Object>(true);
@SuppressWarnings("unchecked")
public static <T> ReadResult<T> create(boolean doWriteLock) {
if (doWriteLock) {
return (ReadResult<T>) READ_RESULT_DO_WRITE_NULL;
}
return (ReadResult<T>) READ_RESULT_NO_WRITE_NULL;
}
public static <T> ReadResult<T> create(boolean doWriteLock, T result) {
if (result == null) {
return create(doWriteLock);
}
return new ReadResult<T>(doWriteLock, result);
}
private final boolean doWriteLock;
private final T result;
private ReadResult(boolean doWriteLock) {
this.doWriteLock = doWriteLock;
this.result = null;
}
private ReadResult(boolean doWriteLock, T result) {
this.doWriteLock = doWriteLock;
this.result = result;
}
public final boolean isDoWriteLock() {
return doWriteLock;
}
public final T getResult() {
return result;
}
@Override
public String toString() {
return "ReadResult [doWriteLock=" + doWriteLock + ", result=" + result + "]";
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + (doWriteLock ? 1231 : 1237);
result = prime * result + ((this.result == null) ? 0 : this.result.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (getClass() != obj.getClass()) return false;
ReadResult other = (ReadResult) obj;
if (doWriteLock != other.doWriteLock) return false;
if (result == null) {
if (other.result != null) return false;
} else if (!result.equals(other.result)) return false;
return true;
}
}