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Lucene example source code file (QueryNodeImpl.java)

This example Lucene source code file (QueryNodeImpl.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

arraylist, deprecated, hashtable, illegalargumentexception, list, map, map, object, object, querynode, querynode, querynodeimpl, querynodeimpl, string, util

The Lucene QueryNodeImpl.java source code

package org.apache.lucene.queryParser.core.nodes;

/**
 * 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.ArrayList;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import java.util.ResourceBundle;

import org.apache.lucene.messages.NLS;
import org.apache.lucene.queryParser.core.messages.QueryParserMessages;
import org.apache.lucene.queryParser.core.util.StringUtils;

/**
 * A {@link QueryNodeImpl} is the default implementation of the interface
 * {@link QueryNode}
 */
public abstract class QueryNodeImpl implements QueryNode, Cloneable {

  private static final long serialVersionUID = 5569870883474845989L;

  /* index default field */
  // TODO remove PLAINTEXT_FIELD_NAME replacing it with configuration APIs
  public static final String PLAINTEXT_FIELD_NAME = "_plain";

  private boolean isLeaf = true;

  private Hashtable<String, Object> tags = new Hashtable();

  private List<QueryNode> clauses = null;

  protected void allocate() {

    if (this.clauses == null) {
      this.clauses = new ArrayList<QueryNode>();

    } else {
      this.clauses.clear();
    }

  }

  public final void add(QueryNode child) {

    if (isLeaf() || this.clauses == null || child == null) {
      throw new IllegalArgumentException(NLS
          .getLocalizedMessage(QueryParserMessages.NODE_ACTION_NOT_SUPPORTED));
    }

    this.clauses.add(child);
    ((QueryNodeImpl) child).setParent(this);

  }

  public final void add(List<QueryNode> children) {

    if (isLeaf() || this.clauses == null) {
      throw new IllegalArgumentException(NLS
          .getLocalizedMessage(QueryParserMessages.NODE_ACTION_NOT_SUPPORTED));
    }

    for (QueryNode child : children) {
      add(child);
    }

  }

  public boolean isLeaf() {
    return this.isLeaf;
  }

  public final void set(List<QueryNode> children) {

    if (isLeaf() || this.clauses == null) {
      ResourceBundle bundle = ResourceBundle
          .getBundle("org.apache.lucene.queryParser.messages.QueryParserMessages");
      String message = bundle.getObject("Q0008E.NODE_ACTION_NOT_SUPPORTED")
          .toString();

      throw new IllegalArgumentException(message);

    }

    // reset parent value
    for (QueryNode child : children) {

      ((QueryNodeImpl) child).setParent(null);

    }

    // allocate new children list
    allocate();

    // add new children and set parent
    for (QueryNode child : children) {
      add(child);
    }
  }

  public QueryNode cloneTree() throws CloneNotSupportedException {
    QueryNodeImpl clone = (QueryNodeImpl) super.clone();
    clone.isLeaf = this.isLeaf;

    // Reset all tags
    clone.tags = new Hashtable<String, Object>();

    // copy children
    if (this.clauses != null) {
      List<QueryNode> localClauses = new ArrayList();
      for (QueryNode clause : this.clauses) {
        localClauses.add(clause.cloneTree());
      }
      clone.clauses = localClauses;
    }

    return clone;
  }

  @Override
  public Object clone() throws CloneNotSupportedException {
    return cloneTree();
  }

  protected void setLeaf(boolean isLeaf) {
    this.isLeaf = isLeaf;
  }

  /**
   * @return a List for QueryNode object. Returns null, for nodes that do not
   *         contain children. All leaf Nodes return null.
   */
  public final List<QueryNode> getChildren() {
    if (isLeaf() || this.clauses == null) {
      return null;
    }
    return this.clauses;
  }

  /**
   * @deprecated use {@link #setTag(String, Object)} instead
   */
  @Deprecated
  public void setTag(CharSequence tagName, Object value) {
    this.tags.put(tagName.toString().toLowerCase(), value);
  }

  public void setTag(String tagName, Object value) {
    this.tags.put(tagName.toLowerCase(), value);
  }

  public void unsetTag(String tagName) {
    this.tags.remove(tagName.toLowerCase());
  }

  /**
   * @deprecated use {@link #unsetTag(String)}
   */
  @Deprecated
  public void unsetTag(CharSequence tagName) {
    this.tags.remove(tagName.toString().toLowerCase());
  }

  /**
   * verify if a node contains a tag
   * 
   * @deprecated use {@link #containsTag(String)} instead
   */
  @Deprecated
  public boolean containsTag(CharSequence tagName) {
    return this.tags.containsKey(tagName.toString().toLowerCase());
  }

  /** verify if a node contains a tag */
  public boolean containsTag(String tagName) {
    return this.tags.containsKey(tagName.toLowerCase());
  }

  /**
   * @deprecated use {@link #getTag(String)} instead
   */
  @Deprecated
  public Object getTag(CharSequence tagName) {
    return this.tags.get(tagName.toString().toLowerCase());
  }

  public Object getTag(String tagName) {
    return this.tags.get(tagName.toString().toLowerCase());
  }

  private QueryNode parent = null;

  private void setParent(QueryNode parent) {
    this.parent = parent;
  }

  public QueryNode getParent() {
    return this.parent;
  }

  protected boolean isRoot() {
    return getParent() == null;
  }

  /**
   * If set to true the the method toQueryString will not write field names
   */
  protected boolean toQueryStringIgnoreFields = false;

  /**
   * This method is use toQueryString to detect if fld is the default field
   * 
   * @param fld - field name
   * @return true if fld is the default field
   */
  // TODO: remove this method, it's commonly used by {@link
  // #toQueryString(org.apache.lucene.queryParser.core.parser.EscapeQuerySyntax)}
  // to figure out what is the default field, however, {@link
  // #toQueryString(org.apache.lucene.queryParser.core.parser.EscapeQuerySyntax)}
  // should receive the default field value directly by parameter
  protected boolean isDefaultField(CharSequence fld) {
    if (this.toQueryStringIgnoreFields)
      return true;
    if (fld == null)
      return true;
    if (QueryNodeImpl.PLAINTEXT_FIELD_NAME.equals(StringUtils.toString(fld)))
      return true;
    return false;
  }

  /**
   * Every implementation of this class should return pseudo xml like this:
   * 
   * For FieldQueryNode: <field start='1' end='2' field='subject' text='foo'/>
   * 
   * @see org.apache.lucene.queryParser.core.nodes.QueryNode#toString()
   */
  @Override
  public String toString() {
    return super.toString();
  }

  /**
   * @see org.apache.lucene.queryParser.core.nodes.QueryNode#getTag(String)
   * @return a Map with all tags for this QueryNode
   * 
   * @deprecated use {@link #getTagMap()} instead
   */
  @SuppressWarnings( { "unchecked" })
  @Deprecated
  public Map<CharSequence, Object> getTags() {
    Map<String, Object> map = (Map) this.tags.clone();
    Map<CharSequence, Object> charSeqMap = new HashMap();

    for (String key : map.keySet()) {
      Object obj = map.get(key);
      charSeqMap.put(key, obj);

    }

    return charSeqMap;

  }

  /**
   * Returns a map containing all tags attached to this query node.
   * 
   * @return a map containing all tags attached to this query node
   */
  @SuppressWarnings("unchecked")
  public Map<String, Object> getTagMap() {
    return (Map<String, Object>) this.tags.clone();
  }

} // end class QueryNodeImpl

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