119 lines
3.5 KiB
Java
119 lines
3.5 KiB
Java
/*
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* Copyright (c) 1999, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.util.regex;
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/**
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* Unchecked exception thrown to indicate a syntax error in a
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* regular-expression pattern.
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*
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* @since 1.4
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*/
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public class PatternSyntaxException
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extends IllegalArgumentException
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{
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@java.io.Serial
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private static final long serialVersionUID = -3864639126226059218L;
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private final String desc;
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private final String pattern;
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private final int index;
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/**
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* Constructs a new instance of this class.
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*
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* @param desc
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* A description of the error
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*
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* @param regex
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* The erroneous pattern
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*
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* @param index
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* The approximate index in the pattern of the error,
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* or {@code -1} if the index is not known
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*/
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public PatternSyntaxException(String desc, String regex, int index) {
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this.desc = desc;
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this.pattern = regex;
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this.index = index;
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}
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/**
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* Retrieves the error index.
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*
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* @return The approximate index in the pattern of the error,
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* or {@code -1} if the index is not known
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*/
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public int getIndex() {
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return index;
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}
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/**
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* Retrieves the description of the error.
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*
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* @return The description of the error
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*/
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public String getDescription() {
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return desc;
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}
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/**
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* Retrieves the erroneous regular-expression pattern.
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*
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* @return The erroneous pattern
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*/
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public String getPattern() {
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return pattern;
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}
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/**
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* Returns a multi-line string containing the description of the syntax
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* error and its index, the erroneous regular-expression pattern, and a
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* visual indication of the error index within the pattern.
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*
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* @return The full detail message
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*/
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public String getMessage() {
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StringBuilder sb = new StringBuilder();
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sb.append(desc);
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if (index >= 0) {
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sb.append(" near index ");
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sb.append(index);
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}
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sb.append(System.lineSeparator());
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sb.append(pattern);
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if (index >= 0 && pattern != null && index < pattern.length()) {
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sb.append(System.lineSeparator());
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for (int i = 0; i < index; i++) {
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sb.append((pattern.charAt(i) == '\t') ? '\t' : ' ');
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}
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sb.append('^');
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}
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return sb.toString();
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}
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}
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