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Field.java
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Field.java
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/*
* Copyright 2015-2016 Austin Keener & Michael Ritter
*
* 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 net.dv8tion.jda.core.managers.fields;
import org.apache.commons.lang3.StringUtils;
import org.json.JSONObject;
import java.util.Objects;
import java.util.function.Supplier;
public abstract class Field<T, M>
{
private final M manager;
private final Supplier<T> originalValue;
private T value;
private boolean set;
public Field(M manager, Supplier<T> originalValue)
{
this.manager = manager;
this.originalValue = originalValue;
this.value = null;
this.set = false;
}
public T getValue()
{
return value;
}
public T getOriginalValue()
{
return originalValue.get();
}
public M setValue(T value)
{
checkValue(value);
this.value = value;
this.set = true;
return manager;
}
public boolean isSet()
{
return set;
}
public boolean shouldUpdate()
{
return isSet() && !equals(getOriginalValue());
}
public M getManager()
{
return manager;
}
public M reset()
{
this.value = null;
this.set = false;
return manager;
}
//Hook method for custom value verification.
public abstract void checkValue(T value);
@Override
public boolean equals(Object o)
{
return isSet() && Objects.equals(o, value);
}
@Override
public String toString()
{
throw new UnsupportedOperationException("toString is disabled for Fields due to possible, accidental usage in JSON bodies.");
}
protected static void checkNull(Object obj, String name)
{
if (obj == null)
throw new NullPointerException("Provided " + name + " was null!");
}
}