pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / queryparser / src / java / org / apache / lucene / queryParser / surround / query / ComposedQuery.java

diff --git a/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/surround/query/ComposedQuery.java b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/surround/query/ComposedQuery.java
new file mode 100644 (file)
index 0000000..0b43d97
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+++ b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/surround/query/ComposedQuery.java
@@ -0,0 +1,121 @@
+package org.apache.lucene.queryParser.surround.query;
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Iterator;
+
+import org.apache.lucene.search.Query;
+
+public abstract class ComposedQuery extends SrndQuery { 
+  
+  public ComposedQuery(List qs, boolean operatorInfix, String opName) {
+    recompose(qs);
+    this.operatorInfix = operatorInfix;
+    this.opName = opName;
+  }
+  
+  protected void recompose(List queries) {
+    if (queries.size() < 2) throw new AssertionError("Too few subqueries"); 
+    this.queries = queries;
+  }
+  
+  private String opName;
+  public String getOperatorName() {return opName;}
+  
+  private List queries;
+  
+  public Iterator getSubQueriesIterator() {return queries.listIterator();}
+
+  public int getNrSubQueries() {return queries.size();}
+  
+  public SrndQuery getSubQuery(int qn) {return (SrndQuery) queries.get(qn);}
+
+  private boolean operatorInfix; 
+  public boolean isOperatorInfix() { return operatorInfix; } /* else prefix operator */
+  
+  public List<Query> makeLuceneSubQueriesField(String fn, BasicQueryFactory qf) {
+    List<Query> luceneSubQueries = new ArrayList<Query>();
+    Iterator sqi = getSubQueriesIterator();
+    while (sqi.hasNext()) {
+      luceneSubQueries.add( ((SrndQuery) sqi.next()).makeLuceneQueryField(fn, qf));
+    }
+    return luceneSubQueries;
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder r = new StringBuilder();
+    if (isOperatorInfix()) {
+      infixToString(r);
+    } else {
+      prefixToString(r);
+    }
+    weightToString(r);
+    return r.toString();
+  }
+
+  /* Override for different spacing */
+  protected String getPrefixSeparator() { return ", ";}
+  protected String getBracketOpen() { return "(";}
+  protected String getBracketClose() { return ")";}
+  
+  protected void infixToString(StringBuilder r) {
+    /* Brackets are possibly redundant in the result. */
+    Iterator sqi = getSubQueriesIterator();
+    r.append(getBracketOpen());
+    if (sqi.hasNext()) {
+      r.append(sqi.next().toString());
+      while (sqi.hasNext()) {
+        r.append(" ");
+        r.append(getOperatorName()); /* infix operator */
+        r.append(" ");
+        r.append(sqi.next().toString());
+      }
+    }
+    r.append(getBracketClose());
+  }
+
+  protected void prefixToString(StringBuilder r) {
+    Iterator sqi = getSubQueriesIterator();
+    r.append(getOperatorName()); /* prefix operator */
+    r.append(getBracketOpen());
+    if (sqi.hasNext()) {
+      r.append(sqi.next().toString());
+      while (sqi.hasNext()) {
+        r.append(getPrefixSeparator());
+        r.append(sqi.next().toString());
+      }
+    }
+    r.append(getBracketClose());
+  }
+  
+  
+  @Override
+  public boolean isFieldsSubQueryAcceptable() {
+    /* at least one subquery should be acceptable */
+    Iterator sqi = getSubQueriesIterator();
+    while (sqi.hasNext()) {
+      if (((SrndQuery) sqi.next()).isFieldsSubQueryAcceptable()) {
+        return true;
+      }
+    }
+    return false;
+  }
+}
+