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org.jboss.weld.probe.Parsers Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source
* Copyright 2016, Red Hat, Inc., and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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.jboss.weld.probe;
import static org.jboss.weld.probe.Strings.AMPERSAND;
import static org.jboss.weld.probe.Strings.ARRAY;
import static org.jboss.weld.probe.Strings.CHEVRONS_LEFT;
import static org.jboss.weld.probe.Strings.CHEVRONS_RIGHT;
import static org.jboss.weld.probe.Strings.COMMA;
import static org.jboss.weld.probe.Strings.EMPTY;
import static org.jboss.weld.probe.Strings.EQUALS;
import static org.jboss.weld.probe.Strings.PARENTHESES_LEFT;
import static org.jboss.weld.probe.Strings.PARENTHESES_RIGHT;
import static org.jboss.weld.probe.Strings.QUTATION_MARK;
import static org.jboss.weld.probe.Strings.WILDCARD;
import static org.jboss.weld.probe.Strings.WILDCARD_EXTENDS;
import static org.jboss.weld.probe.Strings.WILDCARD_SUPER;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.enterprise.inject.Vetoed;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.util.Nonbinding;
import org.jboss.weld.resolution.QualifierInstance;
import org.jboss.weld.resources.WeldClassLoaderResourceLoader;
import org.jboss.weld.resources.spi.ResourceLoader;
import org.jboss.weld.util.reflection.GenericArrayTypeImpl;
import org.jboss.weld.util.reflection.ParameterizedTypeImpl;
import org.jboss.weld.util.reflection.Reflections;
import org.jboss.weld.util.reflection.WildcardTypeImpl;
/**
*
* @author Martin Kouba
*/
@Vetoed
final class Parsers {
private Parsers() {
}
/**
* Type variables are not supported.
*
* @param value
* @return the type
*/
static Type parseType(String value, ResourceLoader resourceLoader) {
value = value.trim();
// Wildcards
if (value.equals(WILDCARD)) {
return WildcardTypeImpl.defaultInstance();
}
if (value.startsWith(WILDCARD_EXTENDS)) {
Type upperBound = parseType(value.substring(WILDCARD_EXTENDS.length(), value.length()), resourceLoader);
if (upperBound == null) {
return null;
}
return WildcardTypeImpl.withUpperBound(upperBound);
}
if (value.startsWith(WILDCARD_SUPER)) {
Type lowerBound = parseType(value.substring(WILDCARD_SUPER.length(), value.length()), resourceLoader);
if (lowerBound == null) {
return null;
}
return WildcardTypeImpl.withLowerBound(lowerBound);
}
// Array
if (value.contains(ARRAY)) {
Type componentType = parseType(value.substring(0, value.indexOf(ARRAY)), resourceLoader);
if (componentType == null) {
return null;
}
return new GenericArrayTypeImpl(componentType);
}
int chevLeft = value.indexOf(CHEVRONS_LEFT);
String rawValue = chevLeft < 0 ? value : value.substring(0, chevLeft);
Class rawRequiredType = tryLoadClass(rawValue, resourceLoader);
if (rawRequiredType == null) {
return null;
}
if (rawRequiredType.getTypeParameters().length == 0) {
return rawRequiredType;
}
// Parameterized type
int chevRight = value.lastIndexOf(CHEVRONS_RIGHT);
if (chevRight < 0) {
return null;
}
List parts = split(value.substring(chevLeft + 1, chevRight), ',', CHEVRONS_LEFT.charAt(0), CHEVRONS_RIGHT.charAt(0));
Type[] typeParameters = new Type[parts.size()];
for (int i = 0; i < typeParameters.length; i++) {
Type typeParam = parseType(parts.get(i), resourceLoader);
if (typeParam == null) {
return null;
}
typeParameters[i] = typeParam;
}
return new ParameterizedTypeImpl(rawRequiredType, typeParameters);
}
/**
*
* @param qualifiers
* @param beanManager
* @return the list of qualifier instances
*/
static List parseQualifiers(String qualifiers, ResourceLoader resourceLoader, BeanManager beanManager) {
List qualifierInstances = new ArrayList<>();
for (String qualifier : splitQualifiers(qualifiers)) {
qualifierInstances.add(createQualifierInstance(qualifier, resourceLoader, beanManager));
}
return qualifierInstances;
}
/**
*
* @param qualifier
* @param resourceLoader
* @param beanManager
* @return the qualifier instance or null
*/
@SuppressWarnings("unchecked")
static QualifierInstance createQualifierInstance(String qualifier, ResourceLoader resourceLoader, BeanManager beanManager) {
String qualifierType = qualifier.contains("(") ? qualifier.substring(0, qualifier.indexOf("(")) : qualifier;
Class qualifierClass = tryLoadClass(qualifierType, resourceLoader);
if (qualifierClass != null) {
Class qualifierAnnotationClass;
try {
qualifierAnnotationClass = (Class) qualifierClass;
} catch (Exception e) {
return null;
}
if (beanManager.isQualifier(qualifierAnnotationClass)) {
Map values;
Method[] qualifierMembers = SecurityActions.getDeclaredMethods(qualifierAnnotationClass);
if (qualifierMembers.length == 0) {
values = Collections.emptyMap();
} else {
Map memberValues = parseMemberValues(qualifier);
values = new HashMap<>();
for (Method method : qualifierMembers) {
if (!method.isAnnotationPresent(Nonbinding.class)) {
String value = memberValues.get(method.getName());
if (value == null) {
Object defaultValue = method.getDefaultValue();
if (defaultValue == null) {
return null;
}
values.put(method.getName(), defaultValue);
} else {
Object extracted = extractValue(method, value);
if (extracted == null) {
return null;
}
values.put(method.getName(), extracted);
}
}
}
}
return new QualifierInstance(qualifierAnnotationClass, Collections.unmodifiableMap(values));
}
}
return null;
}
private static List splitQualifiers(String value) {
if (value == null || value.isEmpty()) {
return Collections.emptyList();
}
return split(value.replace(AMPERSAND, EMPTY), COMMA.charAt(0), PARENTHESES_LEFT.charAt(0), PARENTHESES_RIGHT.charAt(0));
}
private static Map parseMemberValues(String qualifier) {
if (qualifier.contains(PARENTHESES_LEFT) && qualifier.contains(PARENTHESES_RIGHT)) {
Map values = new HashMap<>();
List parts = split(qualifier.substring(qualifier.indexOf(PARENTHESES_LEFT) + 1, qualifier.lastIndexOf(PARENTHESES_RIGHT)), COMMA.charAt(0),
QUTATION_MARK.charAt(0), QUTATION_MARK.charAt(0));
for (String part : parts) {
values.put(part.substring(0, part.indexOf(EQUALS)), part.substring(part.indexOf(EQUALS) + 1, part.length()));
}
return values;
}
return Collections.emptyMap();
}
private static List split(String value, char on, char ignoreStart, char ignoreEnd) {
List values = new ArrayList<>();
boolean ignore = false;
StringBuilder buffer = new StringBuilder();
for (int i = 0; i < value.length(); i++) {
if (value.charAt(i) == on) {
if (!ignore) {
if (buffer.length() > 0) {
values.add(buffer.toString());
buffer = new StringBuilder();
}
} else {
buffer.append(value.charAt(i));
}
} else {
if (value.charAt(i) == ignoreStart) {
ignore = true;
} else if (value.charAt(i) == ignoreEnd) {
ignore = false;
}
buffer.append(value.charAt(i));
}
}
if (buffer.length() > 0) {
values.add(buffer.toString());
}
return values;
}
private static Object extractValue(Method member, String value) {
Class type = member.getReturnType();
if (type.equals(String.class) && value.startsWith(QUTATION_MARK) && value.endsWith(QUTATION_MARK)) {
return value.substring(1, value.length() - 1);
} else if (type.isPrimitive()) {
if (Boolean.TYPE.equals(type)) {
return Boolean.valueOf(value);
} else if (Character.TYPE.equals(type)) {
return Character.valueOf(value.charAt(0));
} else if (Byte.TYPE.equals(type)) {
return Byte.valueOf(value);
} else if (Short.TYPE.equals(type)) {
return Short.valueOf(value);
} else if (Integer.TYPE.equals(type)) {
return Integer.valueOf(value);
} else if (Long.TYPE.equals(type)) {
return Long.valueOf(value);
} else if (Float.TYPE.equals(type)) {
return Float.valueOf(value);
} else if (Double.TYPE.equals(type)) {
return Double.valueOf(value);
}
} else if (type.equals(Class.class)) {
return Reflections.loadClass(value, WeldClassLoaderResourceLoader.INSTANCE);
}
// We do not support annotation-valued and array-valued members
// These should be annotated @Nonbinding in a portable application (see also "5.2.6. Qualifier annotations with members")
return null;
}
private static Class tryLoadClass(String value, ResourceLoader resourceLoader) {
Class result = null;
if (resourceLoader != null) {
// First use the provided ResourceLoader - most probably an implementation that is aware of the module classloader
result = Reflections.loadClass(value, resourceLoader);
}
return result == null ? Reflections.loadClass(value, WeldClassLoaderResourceLoader.INSTANCE) : result;
}
}
