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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 java.nio.ByteBuffer;
import java.util.regex.Pattern;
/**
* Match a field with the contained regular expression.
*
* @author Steinar Knutsen
*/
public class RegExpItem extends TermItem {
private String expression;
private Pattern regexp;
public RegExpItem(String indexName, boolean isFromQuery, String expression) {
super(indexName, isFromQuery, null);
setValue(expression);
}
@Override
public String stringValue() {
return expression;
}
@Override
public boolean isStemmed() {
return true;
}
@Override
public int getNumWords() {
return 1;
}
@Override
public void setValue(String expression) {
regexp = Pattern.compile(expression);
this.expression = expression;
}
@Override
public String getRawWord() {
return stringValue();
}
@Override
public boolean isWords() {
return false;
}
@Override
public String getIndexedString() {
return stringValue();
}
@Override
public ItemType getItemType() {
return ItemType.REGEXP;
}
@Override
public String getName() {
return ItemType.REGEXP.name();
}
protected void encodeThis(ByteBuffer buffer) {
super.encodeThis(buffer);
putString(getIndexedString(), buffer);
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("RegExpItem [expression=").append(expression).append("]");
return builder.toString();
}
@Override
public int hashCode() {
final int prime = 31;
int result = super.hashCode();
result = prime * result + ((expression == null) ? 0 : expression.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!super.equals(obj)) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
RegExpItem other = (RegExpItem) obj;
if (expression == null) {
if (other.expression != null) {
return false;
}
} else if (!expression.equals(other.expression)) {
return false;
}
return true;
}
public Pattern getRegexp() { return regexp; }
}
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