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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package org.chromium.mojo.system;
/**
* Base class for bit field used as flags.
*
* @param <F> the type of the flags.
*/
public abstract class Flags<F extends Flags<F>> {
private int mFlags;
private boolean mImmutable;
/**
* Dedicated constructor.
*
* @param flags initial value of the flag.
*/
protected Flags(int flags) {
mImmutable = false;
mFlags = flags;
}
/**
* @return the computed flag.
*/
public int getFlags() {
return mFlags;
}
/**
* Change the given bit of this flag.
*
* @param value the new value of given bit.
* @return this.
*/
protected F setFlag(int flag, boolean value) {
if (mImmutable) {
throw new UnsupportedOperationException("Flags is immutable.");
}
if (value) {
mFlags |= flag;
} else {
mFlags &= ~flag;
}
@SuppressWarnings("unchecked")
F f = (F) this;
return f;
}
/**
* Makes this flag immutable. This is a non-reversable operation.
*/
protected F immutable() {
mImmutable = true;
@SuppressWarnings("unchecked")
F f = (F) this;
return f;
}
/**
* @see Object#hashCode()
*/
@Override
public int hashCode() {
return mFlags;
}
/**
* @see Object#equals(Object)
*/
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (getClass() != obj.getClass()) return false;
Flags<?> other = (Flags<?>) obj;
if (mFlags != other.mFlags) return false;
return true;
}
}
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