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AbstractIterator (Google Collections Library 1.0-rc5)
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com.google.common.collect</FONT>
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Class AbstractIterator&lt;T&gt;</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 "><A HREF="../../../../com/google/common/collect/UnmodifiableIterator.html" title="class in com.google.common.collect">com.google.common.collect.UnmodifiableIterator</A>&lt;T&gt;
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.google.common.collect.AbstractIterator&lt;T&gt;</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A>&lt;T&gt;</DD>
</DL>
<HR>
<DL>
<DT><PRE>public abstract class <B>AbstractIterator&lt;T&gt;</B><DT>extends <A HREF="../../../../com/google/common/collect/UnmodifiableIterator.html" title="class in com.google.common.collect">UnmodifiableIterator</A>&lt;T&gt;</DL>
</PRE>
<P>
This class provides a skeletal implementation of the <code>Iterator</code>
interface, to make this interface easier to implement for certain types of
data sources.
<p><code>Iterator</code> requires its implementations to support querying the
end-of-data status without changing the iterator's state, using the <A HREF="../../../../com/google/common/collect/AbstractIterator.html#hasNext()"><CODE>hasNext()</CODE></A> method. But many data sources, such as <A HREF="http://java.sun.com/javase/6/docs/api/java/io/Reader.html?is-external=true#read()" title="class or interface in java.io"><CODE>Reader.read()</CODE></A>), do not expose this information; the only way to
discover whether there is any data left is by trying to retrieve it. These
types of data sources are ordinarily difficult to write iterators for. But
using this class, one must implement only the <A HREF="../../../../com/google/common/collect/AbstractIterator.html#computeNext()"><CODE>computeNext()</CODE></A> method,
and invoke the <A HREF="../../../../com/google/common/collect/AbstractIterator.html#endOfData()"><CODE>endOfData()</CODE></A> method when appropriate.
<p>Another example is an iterator that skips over null elements in a backing
iterator. This could be implemented as: <pre> <code>public static Iterator&lt;String&gt; skipNulls(final Iterator&lt;String&gt; in) {
return new AbstractIterator&lt;String&gt;() {
protected String computeNext() {
while (in.hasNext()) {
String s = in.next();
if (s != null) {
return s;
}
}
return endOfData();
}
};
}</code></pre>
This class supports iterators that include null elements.
<P>
<P>
<DL>
<DT><B>Author:</B></DT>
<DD>Kevin Bourrillion</DD>
</DL>
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<P>
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<TD><CODE><B><A HREF="../../../../com/google/common/collect/AbstractIterator.html#AbstractIterator()">AbstractIterator</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<CODE>protected abstract &nbsp;<A HREF="../../../../com/google/common/collect/AbstractIterator.html" title="type parameter in AbstractIterator">T</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/AbstractIterator.html#computeNext()">computeNext</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the next element.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;<A HREF="../../../../com/google/common/collect/AbstractIterator.html" title="type parameter in AbstractIterator">T</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/AbstractIterator.html#endOfData()">endOfData</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Implementations of <code>computeNext</code> <b>must</b> invoke this method when
there are no elements left in the iteration.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/AbstractIterator.html#hasNext()">hasNext</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns <code>true</code> if the iteration has more elements.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../com/google/common/collect/AbstractIterator.html" title="type parameter in AbstractIterator">T</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/AbstractIterator.html#next()">next</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the next element in the iteration.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../com/google/common/collect/AbstractIterator.html" title="type parameter in AbstractIterator">T</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/AbstractIterator.html#peek()">peek</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the next element in the iteration without advancing the iteration,
according to the contract of <A HREF="../../../../com/google/common/collect/PeekingIterator.html#peek()"><CODE>PeekingIterator.peek()</CODE></A>.</TD>
</TR>
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<TH ALIGN="left"><B>Methods inherited from class com.google.common.collect.<A HREF="../../../../com/google/common/collect/UnmodifiableIterator.html" title="class in com.google.common.collect">UnmodifiableIterator</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/google/common/collect/UnmodifiableIterator.html#remove()">remove</A></CODE></TD>
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<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>
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<A NAME="AbstractIterator()"><!-- --></A><H3>
AbstractIterator</H3>
<PRE>
public <B>AbstractIterator</B>()</PRE>
<DL>
</DL>
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<A NAME="computeNext()"><!-- --></A><H3>
computeNext</H3>
<PRE>
protected abstract <A HREF="../../../../com/google/common/collect/AbstractIterator.html" title="type parameter in AbstractIterator">T</A> <B>computeNext</B>()</PRE>
<DL>
<DD>Returns the next element. <b>Note:</b> the implementation must call <A HREF="../../../../com/google/common/collect/AbstractIterator.html#endOfData()"><CODE>endOfData()</CODE></A> when there are no elements left in the iteration. Failure to
do so could result in an infinite loop.
<p>The initial invocation of <A HREF="../../../../com/google/common/collect/AbstractIterator.html#hasNext()"><CODE>hasNext()</CODE></A> or <A HREF="../../../../com/google/common/collect/AbstractIterator.html#next()"><CODE>next()</CODE></A> calls
this method, as does the first invocation of <code>hasNext</code> or <code>next</code> following each successful call to <code>next</code>. Once the
implementation either invokes <code>endOfData</code> or throws an exception,
<code>computeNext</code> is guaranteed to never be called again.
<p>If this method throws an exception, it will propagate outward to the
<code>hasNext</code> or <code>next</code> invocation that invoked this method. Any
further attempts to use the iterator will result in an <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang"><CODE>IllegalStateException</CODE></A>.
<p>The implementation of this method may not invoke the <code>hasNext</code>,
<code>next</code>, or <A HREF="../../../../com/google/common/collect/AbstractIterator.html#peek()"><CODE>peek()</CODE></A> methods on this instance; if it does, an
<code>IllegalStateException</code> will result.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the next element if there was one. If <code>endOfData</code> was called
during execution, the return value will be ignored.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/RuntimeException.html?is-external=true" title="class or interface in java.lang">RuntimeException</A></CODE> - if any unrecoverable error happens. This exception
will propagate outward to the <code>hasNext()</code>, <code>next()</code>, or
<code>peek()</code> invocation that invoked this method. Any further
attempts to use the iterator will result in an
<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang"><CODE>IllegalStateException</CODE></A>.</DL>
</DD>
</DL>
<HR>
<A NAME="endOfData()"><!-- --></A><H3>
endOfData</H3>
<PRE>
protected final <A HREF="../../../../com/google/common/collect/AbstractIterator.html" title="type parameter in AbstractIterator">T</A> <B>endOfData</B>()</PRE>
<DL>
<DD>Implementations of <code>computeNext</code> <b>must</b> invoke this method when
there are no elements left in the iteration.
<P>
<DD><DL>
<DT><B>Returns:</B><DD><code>null</code>; a convenience so your <A HREF="../../../../com/google/common/collect/AbstractIterator.html#computeNext()"><CODE>computeNext()</CODE></A>
implementation can use the simple statement <code>return endOfData();</code></DL>
</DD>
</DL>
<HR>
<A NAME="hasNext()"><!-- --></A><H3>
hasNext</H3>
<PRE>
public final boolean <B>hasNext</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html?is-external=true#hasNext()" title="class or interface in java.util">java.util.Iterator</A></CODE></B></DD>
<DD>Returns <code>true</code> if the iteration has more elements.
(In other words, returns <code>true</code> if <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html?is-external=true#next()" title="class or interface in java.util"><CODE>Iterator.next()</CODE></A> would
return an element rather than throwing an exception.)
<P>
<DD><DL>
<DT><B>Returns:</B><DD><code>true</code> if the iteration has more elements</DL>
</DD>
</DL>
<HR>
<A NAME="next()"><!-- --></A><H3>
next</H3>
<PRE>
public final <A HREF="../../../../com/google/common/collect/AbstractIterator.html" title="type parameter in AbstractIterator">T</A> <B>next</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html?is-external=true#next()" title="class or interface in java.util">java.util.Iterator</A></CODE></B></DD>
<DD>Returns the next element in the iteration.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the next element in the iteration</DL>
</DD>
</DL>
<HR>
<A NAME="peek()"><!-- --></A><H3>
peek</H3>
<PRE>
public final <A HREF="../../../../com/google/common/collect/AbstractIterator.html" title="type parameter in AbstractIterator">T</A> <B>peek</B>()</PRE>
<DL>
<DD>Returns the next element in the iteration without advancing the iteration,
according to the contract of <A HREF="../../../../com/google/common/collect/PeekingIterator.html#peek()"><CODE>PeekingIterator.peek()</CODE></A>.
<p>Implementations of <code>AbstractIterator</code> that wish to expose this
functionality should implement <code>PeekingIterator</code>.
<P>
<DD><DL>
</DL>
</DD>
</DL>
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