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/*******************************************************************************
* Copyright (c) 2006, 2007 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.utility.internal;
/**
* Assorted bit tools
*/
public class BitTools {
/**
* Return whether the specified 'flags' has the specified
* 'flagToCheck' set.
*/
public static boolean flagIsSet(int flags, int flagToCheck) {
return allFlagsAreSet(flags, flagToCheck);
}
/**
* Return whether the specified 'flags' has the specified
* 'flagToCheck' turned off.
*/
public static boolean flagIsOff(int flags, int flagToCheck) {
return allFlagsAreOff(flags, flagToCheck);
}
/**
* Return whether the specified 'flags' has ONLY the specified
* 'flagToCheck' set.
*/
public static boolean onlyFlagIsSet(int flags, int flagToCheck) {
return onlyFlagsAreSet(flags, flagToCheck);
}
/**
* Return whether the specified 'flags' has ONLY the specified
* 'flagToCheck' turned off.
*/
public static boolean onlyFlagIsOff(int flags, int flagToCheck) {
return onlyFlagsAreOff(flags, flagToCheck);
}
/**
* Return whether the specified 'flags' has all the specified
* 'flagsToCheck' set.
*/
public static boolean allFlagsAreSet(int flags, int flagsToCheck) {
return (flags & flagsToCheck) == flagsToCheck;
}
/**
* Return whether the specified 'flags' has all the specified
* 'flagsToCheck' turned off.
*/
public static boolean allFlagsAreOff(int flags, int flagsToCheck) {
return (flags & flagsToCheck) == 0;
}
/**
* Return whether the specified 'flags' has ONLY the specified
* 'flagsToCheck' set.
*/
public static boolean onlyFlagsAreSet(int flags, int flagsToCheck) {
return allFlagsAreSet(flags, flagsToCheck) && allFlagsAreOff(flags, ~flagsToCheck);
}
/**
* Return whether the specified 'flags' has ONLY the specified
* 'flagsToCheck' turned off.
*/
public static boolean onlyFlagsAreOff(int flags, int flagsToCheck) {
return allFlagsAreOff(flags, flagsToCheck) && allFlagsAreSet(flags, ~flagsToCheck);
}
/**
* Return whether the specified 'flags' has any one of the specified
* 'flagsToCheck' set.
*/
public static boolean anyFlagsAreSet(int flags, int flagsToCheck) {
return (flags & flagsToCheck) != 0;
}
/**
* Return whether the specified 'flags' has any one of the specified
* 'flagsToCheck' turned off.
*/
public static boolean anyFlagsAreOff(int flags, int flagsToCheck) {
return (flags & flagsToCheck) != flagsToCheck;
}
/**
* Return whether the specified 'flags' has all the specified
* 'flagsToCheck' set.
*/
public static boolean allFlagsAreSet(int flags, int[] flagsToCheck) {
for (int i = flagsToCheck.length; i-- > 0; ) {
if ( ! allFlagsAreSet(flags, flagsToCheck[i])) {
return false;
}
}
return true;
}
/**
* Return whether the specified 'flags' has all the specified
* 'flagsToCheck' turned off.
*/
public static boolean allFlagsAreOff(int flags, int[] flagsToCheck) {
for (int i = flagsToCheck.length; i-- > 0; ) {
if ( ! allFlagsAreOff(flags, flagsToCheck[i])) {
return false;
}
}
return true;
}
/**
* Return whether the specified 'flags' has ONLY the specified
* 'flagsToCheck' set.
*/
public static boolean onlyFlagsAreSet(int flags, int[] flagsToCheck) {
int combinedFlags = orFlags(flagsToCheck);
return allFlagsAreSet(flags, combinedFlags) && allFlagsAreOff(flags, ~combinedFlags);
}
/**
* Return whether the specified 'flags' has ONLY the specified
* 'flagsToCheck' turned off.
*/
public static boolean onlyFlagsAreOff(int flags, int[] flagsToCheck) {
int combinedFlags = orFlags(flagsToCheck);
return allFlagsAreOff(flags, combinedFlags) && allFlagsAreSet(flags, ~combinedFlags);
}
/**
* Return whether the specified 'flags' has any one of the specified
* 'flagsToCheck' set.
*/
public static boolean anyFlagsAreSet(int flags, int[] flagsToCheck) {
for (int i = flagsToCheck.length; i-- > 0; ) {
if (anyFlagsAreSet(flags, flagsToCheck[i])) {
return true;
}
}
return false;
}
/**
* Return whether the specified 'flags' has any one of the specified
* 'flagsToCheck' turned off.
*/
public static boolean anyFlagsAreOff(int flags, int[] flagsToCheck) {
for (int i = flagsToCheck.length; i-- > 0; ) {
if (anyFlagsAreOff(flags, flagsToCheck[i])) {
return true;
}
}
return false;
}
/**
* OR all the specified 'flags' together and return the result.
*/
public static int orFlags(int[] flags) {
int last = flags.length - 1;
int result = flags[last];
for (int i = last; i-- > 0; ) {
result |= flags[i];
}
return result;
}
/**
* AND all the specified 'flags' together and return the result.
*/
public static int andFlags(int[] flags) {
int last = flags.length - 1;
int result = flags[last];
for (int i = last; i-- > 0; ) {
result &= flags[i];
}
return result;
}
/**
* XOR all the specified 'flags' together and return the result.
*/
public static int xorFlags(int[] flags) {
int last = flags.length - 1;
int result = flags[last];
for (int i = last; i-- > 0; ) {
result ^= flags[i];
}
return result;
}
// ********** constructor **********
/**
* Suppress default constructor, ensuring non-instantiability.
*/
private BitTools() {
super();
throw new UnsupportedOperationException();
}
}
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