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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.woden.xpointer;

/**
 * This class represents Exceptions that can happen during parsing an XPointer Expression.
 * 
 * @author Dan Harvey 
 *
 */
public class InvalidXPointerException extends Exception {
    private static final long serialVersionUID = 0;
    private final String fragment;
    private final Integer startChar;
    private final Integer endChar;
    
    /**
     * Constructs a InvalidXPointerException with a message and fragment properties.
     * 
     * @param message a String message of error.
     * @param fragment a String fragment of the cause.
     */
    public InvalidXPointerException(String message, String fragment) {
        this(message, fragment, null, null, null);
    }
    
    /**
     * Constructs a InvalidXPointerException with a message and fragment properties.
     * 
     * It also has a Throwable argument to support exception chaining.
     * 
     * @param message a String message of error.
     * @param fragment a String fragment of the cause of the error.
     * @param cause a Throwable which caused this exception to be thrown.
     */
    public InvalidXPointerException(String message, String fragment, Throwable cause) {
        this(message, fragment, null, null, cause);
    }
    
    /**
     * Constructs a InvalidXPointerException with a message and fragment properties,
     * and index to the cause inside the fragment.
     * 
     * @param message a String message of error.
     * @param fragment a String fragment of the cause of the error.
     * @param startChar a int char index to the start of the cause in the fragment.
     * @param endChar a int char index to the end of the cause in the fragment.
     */
    public InvalidXPointerException(String message, String fragment, int startChar, int endChar) {
        this(message, fragment, new Integer(startChar), new Integer(endChar), null);
    }
    
    /**
     * Constructs a InvalidXPointerException with a message and fragment properties,
     * and index to the cause inside the fragment.
     * 
     * It also has a Throwable argument to support exception chaining.
     * 
     * @param message a String message of error.
     * @param fragment a String fragment of the cause of the error.
     * @param startChar an int char index to the start of the cause in the fragment.
     * @param endChar an int char index to the end of the cause in the fragment.
     * @param cause a Throwable which caused the exception to be thrown.
     */
    public InvalidXPointerException(String message, String fragment, int startChar, int endChar, Throwable cause) {
        this(message, fragment, new Integer(startChar), new Integer(endChar), cause);
    }

    /**
     * Constructs a new InvalidXPointerException.
     * This constructor is called by all of the above constructors and stores the in indexes and Integers internally.
     * 
     * @param message a String message of error.
     * @param fragment a String fragment of the cause of the error.
     * @param startChar an Integer char index to the start of the cause in the fragment.
     * @param endChar an Integer char index to the end of the cause in the fragment.
     * @param cause a Throwable which caused the exception to be thrown.
     */
    private InvalidXPointerException(String message, String fragment, Integer startChar, Integer endChar, Throwable cause) {
        super(message, cause);
        this.fragment = fragment;
        this.startChar = startChar;
        this.endChar = endChar;
    }
       
    /**
     * Returns the fragment String stored inside this exception.
     * 
     * @return a String fragment.
     */
    public String getFragment() {
        return fragment;
    }
    
    /**
     * Returns the startChar index of the cause of this error in the fragment.
     * 
     * @return an Integer of the startChar index if one exists, otherwise null.
     */
    public Integer getStartChar() {
        return startChar;
    }
    
    /**
     * Returns the endChar index of the cause of this error in the fragment.
     * 
     * @return an Integer of the startChar index if one exists, otherwise null.
     */
    public Integer getEndChar() {
        return endChar;
    }

    /*
     * (non-Javadoc)
     * @see java.lang.Throwable#toString()
     */
    public String toString() {
        String postString;
        if (startChar != null && endChar!= null) {
            postString = "{XPointer: " + fragment + ", start: " + startChar.toString()+ ", end: " + endChar.toString() + ", substr: " + fragment.substring(startChar.intValue(), endChar.intValue()) + "}";
        } else {
            postString = "{XPointer: " + fragment + "}";
        }
        return "InvalidXPointerException: " + getMessage() + ". " + postString;
    }

}