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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.query;
import com.yahoo.compress.IntegerCompressor;
import com.yahoo.prelude.query.textualrepresentation.Discloser;
import java.nio.ByteBuffer;
import java.util.Objects;
/**
* A set of terms which must be near each other to match.
*
* @author bratseth
* @author havardpe
*/
public class NearItem extends CompositeItem {
protected int distance;
/** The default distance used if none is specified: 2 */
public static final int defaultDistance = 2;
/** Creates a NEAR item with distance 2 */
public NearItem() {
setDistance(defaultDistance);
}
/**
* Creates a <i>near</i> item with a limit to the distance between the words.
*
* @param distance the maximum position difference between the words which should be counted as a match
*/
public NearItem(int distance) {
setDistance(distance);
}
public void setDistance(int distance) {
if (distance < 0)
throw new IllegalArgumentException("Can not use negative distance " + distance);
this.distance = distance;
}
public int getDistance() {
return distance;
}
@Override
public ItemType getItemType() {
return ItemType.NEAR;
}
@Override
public String getName() {
return "NEAR";
}
@Override
protected void encodeThis(ByteBuffer buffer) {
super.encodeThis(buffer);
IntegerCompressor.putCompressedPositiveNumber(distance, buffer);
}
@Override
public void disclose(Discloser discloser) {
super.disclose(discloser);
discloser.addProperty("limit", distance);
}
/** Appends the heading of this string - <code>[getName()]([limit]) </code> */
@Override
protected void appendHeadingString(StringBuilder buffer) {
buffer.append(getName());
buffer.append("(");
buffer.append(distance);
buffer.append(")");
buffer.append(" ");
}
@Override
public boolean equals(Object object) {
if (!super.equals(object)) return false;
NearItem other = (NearItem) object; // Ensured by superclass
if (this.distance != other.distance) return false;
return true;
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), distance);
}
}
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