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This is a copy of the good Cojen project from http://cojen.sourceforge.net/ with package name changed
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/*
* Copyright 2007-2010 Brian S O'Neill
*
* 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.
*/
/*
* Copyright 2006 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* 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 com.googlecode.jpattern.org.cojen.util;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Comparator;
/**
* Generic annotation visitor. Override methods to capture specific elements.
*
* @author Brian S O'Neill
* @since 2.1
*/
public class AnnotationVisitor {
private final Comparator mMethodComparator;
/**
* @param sort when true, sort annotation members by name (case sensitive)
*/
public AnnotationVisitor(boolean sort) {
if (sort) {
mMethodComparator = BeanComparator
.forClass(Method.class).orderBy("name").caseSensitive();
} else {
mMethodComparator = null;
}
}
/**
* Visits an annotation by breaking it down into its components and calling
* various other visit methods.
*
* @param value Initial Annotation to visit
* @param param custom parameter
* @return custom result, null by default
*/
public final R visit(Annotation value, P param) {
return visit(null, 0, value, param);
}
/**
* Visits an annotation by breaking it down into its components and calling
* various other visit methods.
*
* @param name member name, or null if array member or not part of an annotation
* @param pos position of member in list or array
* @param value Annotation visited
* @param param custom parameter
* @return custom result, null by default
*/
public R visit(String name, int pos, Annotation value, P param) {
Class annotationType = value.annotationType();
Method[] methods = annotationType.getMethods();
if (mMethodComparator != null) {
Arrays.sort(methods, mMethodComparator);
}
int i = 0;
for (Method m : methods) {
if (m.getDeclaringClass() != annotationType || m.getParameterTypes().length > 0) {
continue;
}
Class propType = m.getReturnType();
if (propType == void.class) {
continue;
}
String propName = m.getName();
Object propValue;
try {
propValue = m.invoke(value);
} catch (Exception e) {
ThrowUnchecked.fireRootCause(e);
return null;
}
if (propType.isArray()) {
if (propType.isPrimitive()) {
propType = propType.getComponentType();
if (propType == int.class) {
visit(propName, i, (int[]) propValue, param);
} else if (propType == long.class) {
visit(propName, i, (long[]) propValue, param);
} else if (propType == float.class) {
visit(propName, i, (float[]) propValue, param);
} else if (propType == double.class) {
visit(propName, i, (double[]) propValue, param);
} else if (propType == boolean.class) {
visit(propName, i, (boolean[]) propValue, param);
} else if (propType == byte.class) {
visit(propName, i, (byte[]) propValue, param);
} else if (propType == short.class) {
visit(propName, i, (short[]) propValue, param);
} else if (propType == char.class) {
visit(propName, i, (char[]) propValue, param);
}
} else if (propValue instanceof String[]) {
visit(propName, i, (String[]) propValue, param);
} else if (propValue instanceof Class[]) {
visit(propName, i, (Class[]) propValue, param);
} else if (propValue instanceof Enum[]) {
visit(propName, i, (Enum[]) propValue, param);
} else if (propValue instanceof Annotation[]) {
visit(propName, i, (Annotation[]) propValue, param);
}
} else if (propType.isPrimitive()) {
if (propType == int.class) {
visit(propName, i, (Integer) propValue, param);
} else if (propType == long.class) {
visit(propName, i, (Long) propValue, param);
} else if (propType == float.class) {
visit(propName, i, (Float) propValue, param);
} else if (propType == double.class) {
visit(propName, i, (Double) propValue, param);
} else if (propType == boolean.class) {
visit(propName, i, (Boolean) propValue, param);
} else if (propType == byte.class) {
visit(propName, i, (Byte) propValue, param);
} else if (propType == short.class) {
visit(propName, i, (Short) propValue, param);
} else if (propType == char.class) {
visit(propName, i, (Character) propValue, param);
}
} else if (propValue instanceof String) {
visit(propName, i, (String) propValue, param);
} else if (propValue instanceof Class) {
visit(propName, i, (Class) propValue, param);
} else if (propValue instanceof Enum) {
visit(propName, i, (Enum) propValue, param);
} else if (propValue instanceof Annotation) {
visit(propName, i, (Annotation) propValue, param);
}
i++;
}
return null;
}
/**
* Override to visit ints.
*
* @param name member name, or null if array member
* @param pos position of member in list or array
* @param value int visited
* @param param custom parameter
* @return custom result, null by default
*/
public R visit(String name, int pos, int value, P param) {
return null;
}
/**
* Override to visit longs.
*
* @param name member name, or null if array member
* @param pos position of member in list or array
* @param value long visited
* @param param custom parameter
* @return custom result, null by default
*/
public R visit(String name, int pos, long value, P param) {
return null;
}
/**
* Override to visit floats.
*
* @param name member name, or null if array member
* @param pos position of member in list or array
* @param value float visited
* @param param custom parameter
* @return custom result, null by default
*/
public R visit(String name, int pos, float value, P param) {
return null;
}
/**
* Override to visit doubles.
*
* @param name member name, or null if array member
* @param pos position of member in list or array
* @param value double visited
* @param param custom parameter
* @return custom result, null by default
*/
public R visit(String name, int pos, double value, P param) {
return null;
}
/**
* Override to visit booleans.
*
* @param name member name, or null if array member
* @param pos position of member in list or array
* @param value boolean visited
* @param param custom parameter
* @return custom result, null by default
*/
public R visit(String name, int pos, boolean value, P param) {
return null;
}
/**
* Override to visit bytes.
*
* @param name member name, or null if array member
* @param pos position of member in list or array
* @param value byte visited
* @param param custom parameter
* @return custom result, null by default
*/
public R visit(String name, int pos, byte value, P param) {
return null;
}
/**
* Override to visit shorts.
*
* @param name member name, or null if array member
* @param pos position of member in list or array
* @param value short visited
* @param param custom parameter
* @return custom result, null by default
*/
public R visit(String name, int pos, short value, P param) {
return null;
}
/**
* Override to visit chars.
*
* @param name member name, or null if array member
* @param pos position of member in list or array
* @param value char visited
* @param param custom parameter
* @return custom result, null by default
*/
public R visit(String name, int pos, char value, P param) {
return null;
}
/**
* Override to visit Strings.
*
* @param name member name, or null if array member
* @param pos position of member in list or array
* @param value String visited
* @param param custom parameter
* @return custom result, null by default
*/
public R visit(String name, int pos, String value, P param) {
return null;
}
/**
* Override to visit Classes.
*
* @param name member name, or null if array member
* @param pos position of member in list or array
* @param value Class visited
* @param param custom parameter
* @return custom result, null by default
*/
public R visit(String name, int pos, Class value, P param) {
return null;
}
/**
* Override to visit Enums.
*
* @param name member name, or null if array member
* @param pos position of member in list or array
* @param value Enum visited
* @param param custom parameter
* @return custom result, null by default
*/
public R visit(String name, int pos, Enum value, P param) {
return null;
}
/**
* Visits each array element.
*
* @param name member name, or null if array member
* @param pos position of member in list or array
* @param value Annotation array visited
* @param param custom parameter
* @return custom result, null by default
*/
public R visit(String name, int pos, Annotation[] value, P param) {
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