org.das2.util

Class BooleanSearch

java.lang.Object

org.das2.util.BooleanSearch

public final class BooleanSearch
extends java.lang.Object

Small Boolean full-text search parser. Requires Java 8 or later.

Operators (case-insensitive): NOT, AND, OR, in descending precedence. Adjacent terms imply AND. Parentheses group expressions; double quotes match literal phrases. A minus sign at the start of a term means NOT. Searches are case-insensitive substring matches, not whole-word matches.

Example: BooleanSearch.compile("(rbsp OR themis) AND density")

Method Summary

Modifier and Type	Method and Description
static java.util.function.Predicate<java.lang.String>	compile(java.lang.String query) Compiles a query once for use against many strings.
static java.util.function.Predicate<java.lang.String>	compileLenient(java.lang.String query) Compiles a partially typed query for interactive search fields.
static boolean	matches(java.lang.String query, java.lang.String text) Convenience method for one-off matches.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

compile

public static java.util.function.Predicate<java.lang.String> compile(java.lang.String query)

Compiles a query once for use against many strings.

compileLenient

public static java.util.function.Predicate<java.lang.String> compileLenient(java.lang.String query)

Compiles a partially typed query for interactive search fields. Incomplete trailing operators and empty opening groups are discarded; unmatched opening parentheses are closed automatically. An unfinished quoted phrase is treated as a phrase extending to the end of the query. Other syntax errors are still reported.

matches

public static boolean matches(java.lang.String query,
                              java.lang.String text)

Convenience method for one-off matches.