phrasequery.html

Lucene是apache软件基金会[4] jakarta项目组的一个子项目

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<A NAME="PhraseQuery()"><!-- --></A><H3>
PhraseQuery</H3>
<PRE>
public <B>PhraseQuery</B>()</PRE>
<DL>
<DD>Constructs an empty phrase query.
<P>
</DL>

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<B>Method Detail</B></FONT></TD>
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<A NAME="setSlop(int)"><!-- --></A><H3>
setSlop</H3>
<PRE>
public void <B>setSlop</B>(int&nbsp;s)</PRE>
<DL>
<DD>Sets the number of other words permitted between words in query phrase.
    If zero, then this is an exact phrase search.  For larger values this works
    like a <code>WITHIN</code> or <code>NEAR</code> operator.

    <p>The slop is in fact an edit-distance, where the units correspond to
    moves of terms in the query phrase out of position.  For example, to switch
    the order of two words requires two moves (the first move places the words
    atop one another), so to permit re-orderings of phrases, the slop must be
    at least two.

    <p>More exact matches are scored higher than sloppier matches, thus search
    results are sorted by exactness.

    <p>The slop is zero by default, requiring exact matches.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getSlop()"><!-- --></A><H3>
getSlop</H3>
<PRE>
public int <B>getSlop</B>()</PRE>
<DL>
<DD>Returns the slop.  See setSlop().
<P>
<DD><DL>
</DL>
</DD>
</DL>
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<A NAME="add(org.apache.lucene.index.Term)"><!-- --></A><H3>
add</H3>
<PRE>
public void <B>add</B>(<A HREF="../../../../org/apache/lucene/index/Term.html" title="class in org.apache.lucene.index">Term</A>&nbsp;term)</PRE>
<DL>
<DD>Adds a term to the end of the query phrase.
 The relative position of the term is the one immediately after the last term added.
<P>
<DD><DL>
</DL>
</DD>
</DL>
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<A NAME="add(org.apache.lucene.index.Term, int)"><!-- --></A><H3>
add</H3>
<PRE>
public void <B>add</B>(<A HREF="../../../../org/apache/lucene/index/Term.html" title="class in org.apache.lucene.index">Term</A>&nbsp;term,
                int&nbsp;position)</PRE>
<DL>
<DD>Adds a term to the end of the query phrase.
 The relative position of the term within the phrase is specified explicitly.
 This allows e.g. phrases with more than one term at the same position
 or phrases with gaps (e.g. in connection with stopwords).
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>term</CODE> - <DD><CODE>position</CODE> - </DL>
</DD>
</DL>
<HR>

<A NAME="getTerms()"><!-- --></A><H3>
getTerms</H3>
<PRE>
public <A HREF="../../../../org/apache/lucene/index/Term.html" title="class in org.apache.lucene.index">Term</A>[] <B>getTerms</B>()</PRE>
<DL>
<DD>Returns the set of terms in this phrase.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getPositions()"><!-- --></A><H3>
getPositions</H3>
<PRE>
public int[] <B>getPositions</B>()</PRE>
<DL>
<DD>Returns the relative positions of terms in this phrase.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="createWeight(org.apache.lucene.search.Searcher)"><!-- --></A><H3>
createWeight</H3>
<PRE>
protected <A HREF="../../../../org/apache/lucene/search/Weight.html" title="interface in org.apache.lucene.search">Weight</A> <B>createWeight</B>(<A HREF="../../../../org/apache/lucene/search/Searcher.html" title="class in org.apache.lucene.search">Searcher</A>&nbsp;searcher)
                       throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../org/apache/lucene/search/Query.html" title="class in org.apache.lucene.search">Query</A></CODE></B></DD>
<DD>Expert: Constructs an appropriate Weight implementation for this query.

 <p>Only implemented by primitive queries, which re-write to themselves.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/apache/lucene/search/Query.html#createWeight(org.apache.lucene.search.Searcher)">createWeight</A></CODE> in class <CODE><A HREF="../../../../org/apache/lucene/search/Query.html" title="class in org.apache.lucene.search">Query</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE></DL>
</DD>
</DL>
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<A NAME="extractTerms(java.util.Set)"><!-- --></A><H3>
extractTerms</H3>
<PRE>
public void <B>extractTerms</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A>&nbsp;queryTerms)</PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../org/apache/lucene/search/Query.html" title="class in org.apache.lucene.search">Query</A></CODE></B></DD>
<DD>Expert: adds all terms occuring in this query to the terms set. Only
 works if this query is in its <A HREF="../../../../org/apache/lucene/search/Query.html#rewrite(org.apache.lucene.index.IndexReader)"><CODE>rewritten</CODE></A> form.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/apache/lucene/search/Query.html#extractTerms(java.util.Set)">extractTerms</A></CODE> in class <CODE><A HREF="../../../../org/apache/lucene/search/Query.html" title="class in org.apache.lucene.search">Query</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/lucene/search/Query.html#extractTerms(java.util.Set)"><CODE>Query.extractTerms(java.util.Set)</CODE></A></DL>
</DD>
</DL>
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<A NAME="toString(java.lang.String)"><!-- --></A><H3>
toString</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>toString</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&nbsp;f)</PRE>
<DL>
<DD>Prints a user-readable version of this query.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/lucene/search/Query.html#toString(java.lang.String)">toString</A></CODE> in class <CODE><A HREF="../../../../org/apache/lucene/search/Query.html" title="class in org.apache.lucene.search">Query</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;o)</PRE>
<DL>
<DD>Returns true iff <code>o</code> is equal to this.
<P>
<DD><DL>
</DL>
</DD>
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<HR>

<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public int <B>hashCode</B>()</PRE>
<DL>
<DD>Returns a hash code value for this object.
<P>
<DD><DL>
</DL>
</DD>
</DL>
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