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package org.apache.lucene.search.regex;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import java.util.regex.Pattern;
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* An implementation tying Java's built-in java.util.regex to RegexQuery.
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* Note that because this implementation currently only returns null from
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* {@link #prefix} that queries using this implementation will enumerate and
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* attempt to {@link #match} each term for the specified field in the index.
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public class JavaUtilRegexCapabilities implements RegexCapabilities {
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private Pattern pattern;
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private int flags = 0;
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// Define the optional flags from Pattern that can be used.
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// Do this here to keep Pattern contained within this class.
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public static final int FLAG_CANON_EQ = Pattern.CANON_EQ;
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public static final int FLAG_CASE_INSENSITIVE = Pattern.CASE_INSENSITIVE;
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public static final int FLAG_COMMENTS = Pattern.COMMENTS;
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public static final int FLAG_DOTALL = Pattern.DOTALL;
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public static final int FLAG_LITERAL = Pattern.LITERAL;
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public static final int FLAG_MULTILINE = Pattern.MULTILINE;
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public static final int FLAG_UNICODE_CASE = Pattern.UNICODE_CASE;
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public static final int FLAG_UNIX_LINES = Pattern.UNIX_LINES;
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* Default constructor that uses java.util.regex.Pattern
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* with its default flags.
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public JavaUtilRegexCapabilities() {
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* Constructor that allows for the modification of the flags that
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* the java.util.regex.Pattern will use to compile the regular expression.
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* This gives the user the ability to fine-tune how the regular expression
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* to match the functionality that they need.
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* The {@link java.util.regex.Pattern Pattern} class supports specifying
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* these fields via the regular expression text itself, but this gives the caller
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* another option to modify the behavior. Useful in cases where the regular expression text
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* cannot be modified, or if doing so is undesired.
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* @param flags The flags that are ORed together.
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public JavaUtilRegexCapabilities(int flags) {
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public void compile(String pattern) {
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this.pattern = Pattern.compile(pattern, this.flags);
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public boolean match(String string) {
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return pattern.matcher(string).matches();
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public String prefix() {
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public boolean equals(Object o) {
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if (this == o) return true;
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if (o == null || getClass() != o.getClass()) return false;
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final JavaUtilRegexCapabilities that = (JavaUtilRegexCapabilities) o;
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if (pattern != null ? !pattern.equals(that.pattern) : that.pattern != null) return false;
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public int hashCode() {
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return (pattern != null ? pattern.hashCode() : 0);