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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 *
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package java.nio.file;

Unchecked exception thrown when path string cannot be converted into a Path because the path string contains invalid characters, or the path string is invalid for other file system specific reasons. 
Since:
1.7/**
 * Unchecked exception thrown when path string cannot be converted into a
 * {@link Path} because the path string contains invalid characters, or
 * the path string is invalid for other file system specific reasons.
 *
 * @since 1.7
 */

public class InvalidPathException
    extends IllegalArgumentException
{
    static final long serialVersionUID = 4355821422286746137L;

    private String input;
    private int index;

    
Constructs an instance from the given input string, reason, and error
index.
Params:
input –   the input string
reason –  a string explaining why the input was rejected
index –  the index at which the error occurred, or -1 if the index is not known
Throws:
NullPointerException –  if either the input or reason strings are null
IllegalArgumentException –  if the error index is less than -1/**
     * Constructs an instance from the given input string, reason, and error
     * index.
     *
     * @param  input   the input string
     * @param  reason  a string explaining why the input was rejected
     * @param  index   the index at which the error occurred,
     *                 or {@code -1} if the index is not known
     *
     * @throws  NullPointerException
     *          if either the input or reason strings are {@code null}
     *
     * @throws  IllegalArgumentException
     *          if the error index is less than {@code -1}
     */
    public InvalidPathException(String input, String reason, int index) {
        super(reason);
        if ((input == null) || (reason == null))
            throw new NullPointerException();
        if (index < -1)
            throw new IllegalArgumentException();
        this.input = input;
        this.index = index;
    }

    
Constructs an instance from the given input string and reason. The resulting object will have an error index of -1. 
Params:
input –   the input string
reason –  a string explaining why the input was rejected
Throws:
NullPointerException –  if either the input or reason strings are null/**
     * Constructs an instance from the given input string and reason.  The
     * resulting object will have an error index of {@code -1}.
     *
     * @param  input   the input string
     * @param  reason  a string explaining why the input was rejected
     *
     * @throws  NullPointerException
     *          if either the input or reason strings are {@code null}
     */
    public InvalidPathException(String input, String reason) {
        this(input, reason, -1);
    }

    
Returns the input string.
Returns:
 the input string/**
     * Returns the input string.
     *
     * @return  the input string
     */
    public String getInput() {
        return input;
    }

    
Returns a string explaining why the input string was rejected.
Returns:
 the reason string/**
     * Returns a string explaining why the input string was rejected.
     *
     * @return  the reason string
     */
    public String getReason() {
        return super.getMessage();
    }

    
Returns an index into the input string of the position at which the error occurred, or -1 if this position is not known. 
Returns:
 the error index/**
     * Returns an index into the input string of the position at which the
     * error occurred, or {@code -1} if this position is not known.
     *
     * @return  the error index
     */
    public int getIndex() {
        return index;
    }

    
Returns a string describing the error. The resulting string consists of the reason string followed by a colon character (':'), a space, and the input string. If the error index is defined then the string " at index " followed by the index, in decimal, is inserted after the reason string and before the colon character. 
Returns:
 a string describing the error/**
     * Returns a string describing the error.  The resulting string
     * consists of the reason string followed by a colon character
     * ({@code ':'}), a space, and the input string.  If the error index is
     * defined then the string {@code " at index "} followed by the index, in
     * decimal, is inserted after the reason string and before the colon
     * character.
     *
     * @return  a string describing the error
     */
    public String getMessage() {
        StringBuilder sb = new StringBuilder();
        sb.append(getReason());
        if (index > -1) {
            sb.append(" at index ");
            sb.append(index);
        }
        sb.append(": ");
        sb.append(input);
        return sb.toString();
    }
}