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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.query;
import com.yahoo.prelude.query.textualrepresentation.Discloser;
/**
* An immutable and'ing of a collection of sub-expressions. It does not
* extend AndItem to avoid code using instanceof handling it as an
* AndItem.
*
* @author Steinar Knutsen
*/
public abstract class SegmentItem extends CompositeItem implements BlockItem {
private boolean locked = false;
private String rawWord;
private String value;
private boolean isFromQuery;
private boolean isFromUser;
private boolean stemmed;
private SegmentingRule segmentingRule = SegmentingRule.LANGUAGE_DEFAULT;
private Substring origin;
/**
* Creates a new segment item
*
* @param rawWord the raw form of this segment as received in the request
* @param current the current transformed version of the raw form, or the raw form repeated if no normalized form is known
* @param isFromQuery whether this segment stems from the query received in the request
* @param stemmed whether this is stemmed
*/
public SegmentItem(String rawWord, String current, boolean isFromQuery, boolean stemmed) {
this(rawWord, current, isFromQuery, stemmed, null);
}
/**
* Creates a new segment item
*
* @param rawWord the raw form of this segment as received in the request
* @param current the current transformed version of the raw form, or the raw form repeated if no normalized form is known
* @param isFromQuery whether this segment stems from the query received in the request
* @param stemmed whether this is stemmed
* @param origin TODO
*/
public SegmentItem(String rawWord, String current, boolean isFromQuery, boolean stemmed, Substring origin) {
this.rawWord = rawWord;
this.value = current;
this.stemmed = stemmed;
this.isFromQuery = isFromQuery;
isFromUser = isFromQuery;
this.origin = origin;
}
public String getRawWord() {
return rawWord;
}
public String getNormalized() {
return value;
}
@Override
public String stringValue() {
return value;
}
public boolean isFromQuery() {
return isFromQuery;
}
public boolean isStemmed() {
return stemmed;
}
public void lock() {
locked = true;
}
public boolean isLocked() {
return locked;
}
@Override
public int getNumWords() {
return getItemCount();
}
public void addItem(Item item) {
if (locked) {
dontAdd();
}
super.addItem(item);
}
public void addItem(int index, Item item) {
if (locked) {
dontAdd();
}
super.addItem(index, item);
}
private void dontAdd() {
throw new IllegalArgumentException("Tried to add item to an immutable segment.");
}
public Item removeItem(int index) {
if (locked) {
dontRemove();
}
return super.removeItem(index);
}
public boolean removeItem(Item item) {
if (locked) {
dontRemove();
}
return super.removeItem(item);
}
private void dontRemove() {
throw new IllegalArgumentException("Tried to remove an item from an immutable segment.");
}
// TODO: Add a getItemIterator which is safe for immutability
/** Return a deep copy of this object */
@Override
public SegmentItem clone() {
SegmentItem copy;
synchronized(this) {
boolean tmpLock = locked;
locked = false;
copy = (SegmentItem) super.clone();
locked = tmpLock;
copy.locked = tmpLock;
}
return copy;
}
public boolean isWords() {
return true;
}
public boolean isFromUser() {
return isFromUser;
}
public void setFromUser(boolean isFromUser) {
this.isFromUser = isFromUser;
}
/** Returns null right now */
public Substring getOrigin() {
return origin;
}
@Override
public void disclose(Discloser discloser) {
super.disclose(discloser);
discloser.addProperty("isFromQuery", isFromQuery);
discloser.addProperty("isFromUser", isFromUser);
discloser.addProperty("locked", locked);
discloser.addProperty("rawWord", rawWord);
discloser.addProperty("stemmed", stemmed);
}
@Override
public SegmentingRule getSegmentingRule() {
return segmentingRule;
}
public void setSegmentingRule(SegmentingRule segmentingRule) {
this.segmentingRule = segmentingRule;
}
}
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