org.snapscript.dx.rop.cst.CstLiteralBits Maven / Gradle / Ivy
/*
* Copyright (C) 2007 The Android Open Source Project
*
* 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 org.snapscript.dx.rop.cst;
/**
* Constants which are literal bitwise values of some sort.
*/
public abstract class CstLiteralBits
extends TypedConstant {
/**
* Returns whether or not this instance's value may be accurately
* represented as an {@code int}. The rule is that if there
* is an {@code int} which may be sign-extended to yield this
* instance's value, then this method returns {@code true}.
* Otherwise, it returns {@code false}.
*
* @return {@code true} iff this instance fits in an {@code int}
*/
public abstract boolean fitsInInt();
/**
* Gets the value as {@code int} bits. If this instance contains
* more bits than fit in an {@code int}, then this returns only
* the low-order bits.
*
* @return the bits
*/
public abstract int getIntBits();
/**
* Gets the value as {@code long} bits. If this instance contains
* fewer bits than fit in a {@code long}, then the result of this
* method is the sign extension of the value.
*
* @return the bits
*/
public abstract long getLongBits();
/**
* Returns true if this value can fit in 16 bits with sign-extension.
*
* @return true if the sign-extended lower 16 bits are the same as
* the value.
*/
public boolean fitsIn16Bits() {
if (! fitsInInt()) {
return false;
}
int bits = getIntBits();
return (short) bits == bits;
}
/**
* Returns true if this value can fit in 8 bits with sign-extension.
*
* @return true if the sign-extended lower 8 bits are the same as
* the value.
*/
public boolean fitsIn8Bits() {
if (! fitsInInt()) {
return false;
}
int bits = getIntBits();
return (byte) bits == bits;
}
}