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/**
* Copyright (c) 2014, University of Warsaw
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package pl.edu.mimuw.cloudatlas.model;
/**
* Class for wrapping Java types into <code>Value</code> objects.
* <p>
* This class is immutable.
*
* @param <T> a wrapped type
*/
abstract class ValueSimple<T> extends Value {
private T value;
/**
* Constructs a new <code>Value</code> wrapping the specified <code>value</code>.
*
* @param value the value to wrap
*/
public ValueSimple(T value) {
setValue(value);
}
/* Kryo needs a no-args constructor */
protected ValueSimple() {
}
/**
* Returns a hash code value for this object. This is a hash code of underlying wrapped object.
*
* @return the hash code for this value
*/
@Override
public int hashCode() {
return getValue().hashCode();
}
/**
* Gets a wrapped object.
*
* @return the wrapped value
*/
public T getValue() {
return value;
}
/**
* Sets a wrapped value. This method is not public to ensure that the underlying value cannot be changed.
*
* @param value the value to set
*/
void setValue(T value) {
this.value = value;
}
@Override
public boolean isNull() {
return value == null;
}
@SuppressWarnings("unchecked")
@Override
public Value isEqual(Value v) {
sameTypesOrThrow(v, Operation.EQUAL);
if(isNull() && v.isNull())
return new ValueBoolean(true);
else if(isNull() || v.isNull())
return new ValueBoolean(false);
return new ValueBoolean(value.equals(((ValueSimple<T>)v).getValue()));
}
}
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