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Booleans (Guava Libraries 2010.01.04)
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com.google.common.primitives</FONT>
<BR>
Class Booleans</H2>
<PRE>
<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.google.common.primitives.Booleans</B>
</PRE>
<HR>
<DL>
<DT><PRE>public final class <B>Booleans</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL>
</PRE>
<P>
Static utility methods pertaining to <code>boolean</code> primitives, that are not
already found in either <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang"><CODE>Boolean</CODE></A> or <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Arrays.html?is-external=true" title="class or interface in java.util"><CODE>Arrays</CODE></A>.
<P>
<P>
<DL>
<DT><B>Since:</B></DT>
<DD>2009.09.15 <b>tentative</b></DD>
<DT><B>Author:</B></DT>
<DD>Kevin Bourrillion</DD>
</DL>
<HR>
<P>
<!-- ========== METHOD SUMMARY =========== -->
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<B>Method Summary</B></FONT></TH>
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<CODE>static <A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A><<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</A>></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/primitives/Booleans.html#asList(boolean...)">asList</A></B>(boolean... backingArray)</CODE>
<BR>
Returns a fixed-size list backed by the specified array, similar to <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Arrays.html?is-external=true#asList(T...)" title="class or interface in java.util"><CODE>Arrays.asList(Object[])</CODE></A>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/primitives/Booleans.html#compare(boolean, boolean)">compare</A></B>(boolean a,
boolean b)</CODE>
<BR>
Compares the two specified <code>boolean</code> values in the standard way
(<code>false</code> is considered less than <code>true</code>).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static boolean[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/primitives/Booleans.html#concat(boolean[]...)">concat</A></B>(boolean[]... arrays)</CODE>
<BR>
Returns the values from each provided array combined into a single array.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/primitives/Booleans.html#contains(boolean[], boolean)">contains</A></B>(boolean[] array,
boolean target)</CODE>
<BR>
Returns <code>true</code> if <code>target</code> is present as an element anywhere in
<code>array</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static boolean[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/primitives/Booleans.html#ensureCapacity(boolean[], int, int)">ensureCapacity</A></B>(boolean[] array,
int minLength,
int padding)</CODE>
<BR>
Returns an array containing the same values as <code>array</code>, but
guaranteed to be of a specified minimum length.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/primitives/Booleans.html#hashCode(boolean)">hashCode</A></B>(boolean value)</CODE>
<BR>
Returns a hash code for <code>value</code>; equal to the result of invoking
<code>((Boolean) value).hashCode()</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/primitives/Booleans.html#indexOf(boolean[], boolean)">indexOf</A></B>(boolean[] array,
boolean target)</CODE>
<BR>
Returns the index of the first appearance of the value <code>target</code> in
<code>array</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/primitives/Booleans.html#indexOf(boolean[], boolean[])">indexOf</A></B>(boolean[] array,
boolean[] target)</CODE>
<BR>
Returns the start position of the first occurrence of the specified <code>target</code> within <code>array</code>, or <code>-1</code> if there is no such occurrence.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/primitives/Booleans.html#join(java.lang.String, boolean...)">join</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> separator,
boolean... array)</CODE>
<BR>
Returns a string containing the supplied <code>boolean</code> values separated
by <code>separator</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/primitives/Booleans.html#lastIndexOf(boolean[], boolean)">lastIndexOf</A></B>(boolean[] array,
boolean target)</CODE>
<BR>
Returns the index of the last appearance of the value <code>target</code> in
<code>array</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</A><boolean[]></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/primitives/Booleans.html#lexicographicalComparator()">lexicographicalComparator</A></B>()</CODE>
<BR>
Returns a comparator that compares two <code>boolean</code> arrays
lexicographically.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static boolean[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/primitives/Booleans.html#toArray(java.util.Collection)">toArray</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</A><<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</A>> collection)</CODE>
<BR>
Copies a collection of <code>Boolean</code> instances into a new array of
primitive <code>boolean</code> values.</TD>
</TR>
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<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
</TR>
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<B>Method Detail</B></FONT></TH>
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<A NAME="hashCode(boolean)"><!-- --></A><H3>
hashCode</H3>
<PRE>
public static int <B>hashCode</B>(boolean value)</PRE>
<DL>
<DD>Returns a hash code for <code>value</code>; equal to the result of invoking
<code>((Boolean) value).hashCode()</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - a primitive <code>boolean</code> value
<DT><B>Returns:</B><DD>a hash code for the value</DL>
</DD>
</DL>
<HR>
<A NAME="compare(boolean, boolean)"><!-- --></A><H3>
compare</H3>
<PRE>
public static int <B>compare</B>(boolean a,
boolean b)</PRE>
<DL>
<DD>Compares the two specified <code>boolean</code> values in the standard way
(<code>false</code> is considered less than <code>true</code>). The sign of the
value returned is the same as that of <code>((Boolean) a).compareTo(b)</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>a</CODE> - the first <code>boolean</code> to compare<DD><CODE>b</CODE> - the second <code>boolean</code> to compare
<DT><B>Returns:</B><DD>a positive number if only <code>a</code> is <code>true</code>, a negative
number if only <code>b</code> is true, or zero if <code>a == b</code></DL>
</DD>
</DL>
<HR>
<A NAME="contains(boolean[], boolean)"><!-- --></A><H3>
contains</H3>
<PRE>
public static boolean <B>contains</B>(boolean[] array,
boolean target)</PRE>
<DL>
<DD>Returns <code>true</code> if <code>target</code> is present as an element anywhere in
<code>array</code>.
<p><b>Note:</b> consider representing the array as a <A HREF="http://java.sun.com/javase/6/docs/api/java/util/BitSet.html?is-external=true" title="class or interface in java.util"><CODE>BitSet</CODE></A> instead, replacing <code>Booleans.contains(array, true)</code>
with <code>!bitSet.isEmpty()</code> and <code>Booleans.contains(array, false)</code>
with <code>bitSet.nextClearBit(0) == sizeOfBitSet</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>array</CODE> - an array of <code>boolean</code> values, possibly empty<DD><CODE>target</CODE> - a primitive <code>boolean</code> value
<DT><B>Returns:</B><DD><code>true</code> if <code>array[i] == target</code> for some value of <code>i</code></DL>
</DD>
</DL>
<HR>
<A NAME="indexOf(boolean[], boolean)"><!-- --></A><H3>
indexOf</H3>
<PRE>
public static int <B>indexOf</B>(boolean[] array,
boolean target)</PRE>
<DL>
<DD>Returns the index of the first appearance of the value <code>target</code> in
<code>array</code>.
<p><b>Note:</b> consider representing the array as a <A HREF="http://java.sun.com/javase/6/docs/api/java/util/BitSet.html?is-external=true" title="class or interface in java.util"><CODE>BitSet</CODE></A>
instead, and using <A HREF="http://java.sun.com/javase/6/docs/api/java/util/BitSet.html?is-external=true#nextSetBit(int)" title="class or interface in java.util"><CODE>BitSet.nextSetBit(int)</CODE></A> or <A HREF="http://java.sun.com/javase/6/docs/api/java/util/BitSet.html?is-external=true#nextClearBit(int)" title="class or interface in java.util"><CODE>BitSet.nextClearBit(int)</CODE></A>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>array</CODE> - an array of <code>boolean</code> values, possibly empty<DD><CODE>target</CODE> - a primitive <code>boolean</code> value
<DT><B>Returns:</B><DD>the least index <code>i</code> for which <code>array[i] == target</code>, or
<code>-1</code> if no such index exists.</DL>
</DD>
</DL>
<HR>
<A NAME="indexOf(boolean[], boolean[])"><!-- --></A><H3>
indexOf</H3>
<PRE>
public static int <B>indexOf</B>(boolean[] array,
boolean[] target)</PRE>
<DL>
<DD>Returns the start position of the first occurrence of the specified <code>target</code> within <code>array</code>, or <code>-1</code> if there is no such occurrence.
<p>More formally, returns the lowest index <code>i</code> such that <code>java.util.Arrays.copyOfRange(array, i, i + target.length)</code> contains exactly
the same elements as <code>target</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>array</CODE> - the array to search for the sequence <code>target</code><DD><CODE>target</CODE> - the array to search for as a sub-sequence of <code>array</code></DL>
</DD>
</DL>
<HR>
<A NAME="lastIndexOf(boolean[], boolean)"><!-- --></A><H3>
lastIndexOf</H3>
<PRE>
public static int <B>lastIndexOf</B>(boolean[] array,
boolean target)</PRE>
<DL>
<DD>Returns the index of the last appearance of the value <code>target</code> in
<code>array</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>array</CODE> - an array of <code>boolean</code> values, possibly empty<DD><CODE>target</CODE> - a primitive <code>boolean</code> value
<DT><B>Returns:</B><DD>the greatest index <code>i</code> for which <code>array[i] == target</code>,
or <code>-1</code> if no such index exists.</DL>
</DD>
</DL>
<HR>
<A NAME="concat(boolean[]...)"><!-- --></A><H3>
concat</H3>
<PRE>
public static boolean[] <B>concat</B>(boolean[]... arrays)</PRE>
<DL>
<DD>Returns the values from each provided array combined into a single array.
For example, <code>concat(new boolean[] {a, b}, new boolean[] {}, new
boolean[] {c}</code> returns the array <code>{a, b, c}</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>arrays</CODE> - zero or more <code>boolean</code> arrays
<DT><B>Returns:</B><DD>a single array containing all the values from the source arrays, in
order</DL>
</DD>
</DL>
<HR>
<A NAME="ensureCapacity(boolean[], int, int)"><!-- --></A><H3>
ensureCapacity</H3>
<PRE>
public static boolean[] <B>ensureCapacity</B>(boolean[] array,
int minLength,
int padding)</PRE>
<DL>
<DD>Returns an array containing the same values as <code>array</code>, but
guaranteed to be of a specified minimum length. If <code>array</code> already
has a length of at least <code>minLength</code>, it is returned directly.
Otherwise, a new array of size <code>minLength + padding</code> is returned,
containing the values of <code>array</code>, and zeroes in the remaining places.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>array</CODE> - the source array<DD><CODE>minLength</CODE> - the minimum length the returned array must guarantee<DD><CODE>padding</CODE> - an extra amount to "grow" the array by if growth is
necessary
<DT><B>Returns:</B><DD>an array containing the values of <code>array</code>, with guaranteed
minimum length <code>minLength</code>
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - if <code>minLength</code> or <code>padding</code> is
negative</DL>
</DD>
</DL>
<HR>
<A NAME="join(java.lang.String, boolean...)"><!-- --></A><H3>
join</H3>
<PRE>
public static <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>join</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> separator,
boolean... array)</PRE>
<DL>
<DD>Returns a string containing the supplied <code>boolean</code> values separated
by <code>separator</code>. For example, <code>join("-", false, true, false)</code>
returns the string <code>"false-true-false"</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>separator</CODE> - the text that should appear between consecutive values in
the resulting string (but not at the start or end)<DD><CODE>array</CODE> - an array of <code>boolean</code> values, possibly empty</DL>
</DD>
</DL>
<HR>
<A NAME="lexicographicalComparator()"><!-- --></A><H3>
lexicographicalComparator</H3>
<PRE>
public static <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</A><boolean[]> <B>lexicographicalComparator</B>()</PRE>
<DL>
<DD>Returns a comparator that compares two <code>boolean</code> arrays
lexicographically. That is, it compares, using <A HREF="../../../../com/google/common/primitives/Booleans.html#compare(boolean, boolean)"><CODE>compare(boolean, boolean)</CODE></A>), the first pair of values that follow any
common prefix, or when one array is a prefix of the other, treats the
shorter array as the lesser. For example,
<code>[] < [false] < [false, true] < [true]</code>.
<p>The returned comparator is inconsistent with <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang"><CODE>Object.equals(Object)</CODE></A> (since arrays support only identity equality), but
it is consistent with <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Arrays.html?is-external=true#equals(boolean[], boolean[])" title="class or interface in java.util"><CODE>Arrays.equals(boolean[], boolean[])</CODE></A>.
<P>
<DD><DL>
<DT><B>Since:</B></DT>
<DD>2010.01.04 <b>tentative</b></DD>
<DT><B>See Also:</B><DD><a href="http://en.wikipedia.org/wiki/Lexicographical_order">
Lexicographical order</a> article at Wikipedia</DL>
</DD>
</DL>
<HR>
<A NAME="toArray(java.util.Collection)"><!-- --></A><H3>
toArray</H3>
<PRE>
public static boolean[] <B>toArray</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</A><<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</A>> collection)</PRE>
<DL>
<DD>Copies a collection of <code>Boolean</code> instances into a new array of
primitive <code>boolean</code> values.
<p>Elements are copied from the argument collection as if by <code>collection.toArray()</code>. Calling this method is as thread-safe as calling
that method.
<p><b>Note:</b> consider representing the collection as a <A HREF="http://java.sun.com/javase/6/docs/api/java/util/BitSet.html?is-external=true" title="class or interface in java.util"><CODE>BitSet</CODE></A> instead.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>collection</CODE> - a collection of <code>Boolean</code> objects
<DT><B>Returns:</B><DD>an array containing the same values as <code>collection</code>, in the
same order, converted to primitives
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</A></CODE> - if <code>collection</code> or any of its elements
is null</DL>
</DD>
</DL>
<HR>
<A NAME="asList(boolean...)"><!-- --></A><H3>
asList</H3>
<PRE>
public static <A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A><<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</A>> <B>asList</B>(boolean... backingArray)</PRE>
<DL>
<DD>Returns a fixed-size list backed by the specified array, similar to <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Arrays.html?is-external=true#asList(T...)" title="class or interface in java.util"><CODE>Arrays.asList(Object[])</CODE></A>. The list supports <A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true#set(int, E)" title="class or interface in java.util"><CODE>List.set(int, Object)</CODE></A>,
but any attempt to set a value to <code>null</code> will result in a <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang"><CODE>NullPointerException</CODE></A>.
<p>The returned list maintains the values, but not the identities, of
<code>Boolean</code> objects written to or read from it. For example, whether
<code>list.get(0) == list.get(0)</code> is true for the returned list is
unspecified.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>backingArray</CODE> - the array to back the list
<DT><B>Returns:</B><DD>a list view of the array</DL>
</DD>
</DL>
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