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Commons Attributes example source code file (ParameterIndexOutOfBoundsException.java)

This example Commons Attributes source code file (ParameterIndexOutOfBoundsException.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Attributes tags/keywords

indexoutofboundsexception, indexoutofboundsexception, parameterindexoutofboundsexception, parameterindexoutofboundsexception, string, string

The Commons Attributes ParameterIndexOutOfBoundsException.java source code

/*
 * Copyright 2003-2004 The Apache Software Foundation
 * 
 * Licensed 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.commons.attributes;

/**
 * Thrown when attempting to get attributes for a parameter of a constructor or method
 * and the parameter index is out of bounds.
 *
 * <p>Note: for performance reasons, this exception is only thrown when the 
 * Commons Attribute runtime can quickly determine that the index is out of bounds.
 * Therefore, you may sometimes be able to pass an invalid index and not receive this
 * exception. For example, if the runtime knows that the method or constructor has
 * no attributes at all, an empty collection / null or false (as appropriate) will be 
 * returned instead. Put simply, <i>don't use this exception to test how many parameters
 * a method or constructor has.
 *
 * @since 2.2
 */
public class ParameterIndexOutOfBoundsException extends IndexOutOfBoundsException {
    
    /**
     * Create a new ParameterIndexOutOfBoundsException.
     *
     * @param methodOrConstructorName the name of the method or constructor whose parameter
     *                                the client tried to get attributes for.
     * @param index the index supplied by the client.
     * @param maxIndex the maximum + 1 parameter index allowed. For example, if a method takes
     *                 two parameters, the maximum allowed index is 1, and this parameter should
     *                 be set to 2. There is no minIndex parameter - it is assumed to be 0.
     */ 
    public ParameterIndexOutOfBoundsException (String methodOrConstructorName, int index, int maxIndex) {
        super (formatMessage (methodOrConstructorName, index, maxIndex));
    }
    
    private static String formatMessage (String methodOrConstructorName, int index, int maxIndex) {
        if (index < 0) {
            return String.valueOf (index);
        } else {
            return index + ". " + methodOrConstructorName + " has " + maxIndex + " parameters.";
        }
    }
}

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