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125 lines
2.7 KiB
125 lines
2.7 KiB
/*
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* Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.util.regex;
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import sun.security.action.GetPropertyAction;
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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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* @author unascribed
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* @since 1.4
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* @spec JSR-51
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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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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 <tt>-1</tt> 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 <tt>-1</tt> 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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private static final String nl =
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java.security.AccessController
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.doPrivileged(new GetPropertyAction("line.separator"));
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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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StringBuffer sb = new StringBuffer();
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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(nl);
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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(nl);
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for (int i = 0; i < index; i++) sb.append(' ');
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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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