/*
 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package java.net;


/**
 * Checked exception thrown to indicate that a string could not be parsed as a
 * URI reference.
 *
 * @author Mark Reinhold
 * @see URI
 * @since 1.4
 */

public class URISyntaxException
 extends Exception
{
 private static final long serialVersionUID = 2137979680897488891L;

 private String input;
 private int index;

 /**
 * 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 could not be parsed
 * @param index The index at which the parse 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 URISyntaxException(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 {@code -1}.
 *
 * @param input The input string
 * @param reason A string explaining why the input could not be parsed
 *
 * @throws NullPointerException
 * If either the input or reason strings are {@code null}
 */
 public URISyntaxException(String input, String reason) {
 this(input, reason, -1);
 }

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

 /**
 * Returns a string explaining why the input string could not be parsed.
 *
 * @return The reason string
 */
 public String getReason() {
 return super.getMessage();
 }

 /**
 * Returns an index into the input string of the position at which the
 * parse 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 parse 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 parse 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();
 }

}