- /*
- * 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;
-
- import java.util.ArrayList;
- import java.util.List;
-
- /**
- * Thrown when an attribute has a {@link Target} declaration that forbids
- * it being applied to the program element it has been applied to.
- *
- * <p>For example:
- *
- * <pre><code>
- * / **
- * * This attribute can only be applied to Classes.
- * * Target(Target.CLASS)
- * * /
- * public class MyAttribute {}
- *
- * public class MyClass {
- * / **
- * * Error: Can't apply MyAttribute to a field!
- * * MyAttribute()
- * * /
- * private String myField;
- * }
- * </code></pre>
- */
- public class InvalidAttributeTargetError extends Error {
-
- public InvalidAttributeTargetError (String attributeClass, String element, int targetFlags) {
- super ("Attributes of type " + attributeClass + " can't be applied to " + element + ". " +
- "They can only be applied to: " + flagsToString (targetFlags));
- }
-
- private final static String flagsToString (int flags) {
- List targetNames = new ArrayList ();
- if ((flags & Target.CLASS) > 0) {
- targetNames.add ("CLASS");
- }
- if ((flags & Target.FIELD) > 0) {
- targetNames.add ("FIELD");
- }
- if ((flags & Target.METHOD) > 0) {
- targetNames.add ("METHOD");
- }
- if ((flags & Target.CONSTRUCTOR) > 0) {
- targetNames.add ("CONSTRUCTOR");
- }
- if ((flags & Target.METHOD_PARAMETER) > 0) {
- targetNames.add ("METHOD_PARAMETER");
- }
- if ((flags & Target.CONSTRUCTOR_PARAMETER) > 0) {
- targetNames.add ("CONSTRUCTOR_PARAMETER");
- }
- if ((flags & Target.RETURN) > 0) {
- targetNames.add ("RETURN");
- }
-
- StringBuffer sb = new StringBuffer ();
- for (int i = 0; i < targetNames.size (); i++) {
- sb.append (targetNames.get (i));
- if (i < targetNames.size () - 1) {
- sb.append (" | ");
- }
- }
- return sb.toString ();
- }
-
- }