org.apache.activemq.protobuf.compiler.IntrospectionSupport Maven / Gradle / Ivy
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Puts together an ActiveMQ OSGi bundle
/**
* 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.activemq.protobuf.compiler;
import java.beans.PropertyEditor;
import java.beans.PropertyEditorManager;
import java.io.File;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.Map.Entry;
/**
* Support class used to do introspection/reflection based setting and getting of properties on a Java Bean.
*
* @author Hiram Chirino
*/
public final class IntrospectionSupport {
private IntrospectionSupport() {
}
public static boolean getProperties(Object target, Map props, String optionPrefix) {
boolean rc = false;
if (target == null) {
throw new IllegalArgumentException("target was null.");
}
if (props == null) {
throw new IllegalArgumentException("props was null.");
}
if (optionPrefix == null) {
optionPrefix = "";
}
Class clazz = target.getClass();
Method[] methods = clazz.getMethods();
for (int i = 0; i < methods.length; i++) {
Method method = methods[i];
String name = method.getName();
Class type = method.getReturnType();
Class params[] = method.getParameterTypes();
if (name.startsWith("get") && params.length == 0 && type != null && isSettableType(type)) {
try {
Object value = method.invoke(target, new Object[] {});
if (value == null) {
continue;
}
String strValue = convertToString(value, type);
if (strValue == null) {
continue;
}
name = name.substring(3, 4).toLowerCase() + name.substring(4);
props.put(optionPrefix + name, strValue);
rc = true;
} catch (Throwable ignore) {
}
}
}
return rc;
}
public static boolean setProperties(Object target, Map props, String optionPrefix) {
boolean rc = false;
if (target == null) {
throw new IllegalArgumentException("target was null.");
}
if (props == null) {
throw new IllegalArgumentException("props was null.");
}
for (Iterator iter = props.keySet().iterator(); iter.hasNext();) {
String name = iter.next();
if (name.startsWith(optionPrefix)) {
Object value = props.get(name);
name = name.substring(optionPrefix.length());
if (setProperty(target, name, value)) {
iter.remove();
rc = true;
}
}
}
return rc;
}
public static Map extractProperties(Map props, String optionPrefix) {
if (props == null) {
throw new IllegalArgumentException("props was null.");
}
HashMap rc = new HashMap(props.size());
for (Iterator iter = props.keySet().iterator(); iter.hasNext();) {
String name = (String)iter.next();
if (name.startsWith(optionPrefix)) {
Object value = props.get(name);
name = name.substring(optionPrefix.length());
rc.put(name, value);
iter.remove();
}
}
return rc;
}
public static boolean setProperties(Object target, Map props) {
boolean rc = false;
if (target == null) {
throw new IllegalArgumentException("target was null.");
}
if (props == null) {
throw new IllegalArgumentException("props was null.");
}
for (Iterator iter = props.entrySet().iterator(); iter.hasNext();) {
Map.Entry entry = (Entry)iter.next();
if (setProperty(target, (String)entry.getKey(), entry.getValue())) {
iter.remove();
rc = true;
}
}
return rc;
}
public static boolean setProperty(Object target, String name, Object value) {
try {
Class clazz = target.getClass();
Method setter = findSetterMethod(clazz, name);
if (setter == null) {
return false;
}
// If the type is null or it matches the needed type, just use the
// value directly
if (value == null || value.getClass() == setter.getParameterTypes()[0]) {
setter.invoke(target, new Object[] {value});
} else {
// We need to convert it
setter.invoke(target, new Object[] {convert(value, setter.getParameterTypes()[0])});
}
return true;
} catch (Throwable ignore) {
return false;
}
}
private static Object convert(Object value, Class type) throws URISyntaxException {
PropertyEditor editor = PropertyEditorManager.findEditor(type);
if (editor != null) {
editor.setAsText(value.toString());
return editor.getValue();
}
if (type == URI.class) {
return new URI(value.toString());
}
if (type == File.class) {
return new File(value.toString());
}
if (type == File[].class) {
ArrayList files = new ArrayList();
StringTokenizer st = new StringTokenizer(value.toString(), ":");
while(st.hasMoreTokens()) {
String t = st.nextToken();
if( t!=null && t.trim().length()>0 ) {
files.add(new File(t.trim()));
}
}
File rc[] = new File[files.size()];
files.toArray(rc);
return rc;
}
return null;
}
private static String convertToString(Object value, Class type) throws URISyntaxException {
PropertyEditor editor = PropertyEditorManager.findEditor(type);
if (editor != null) {
editor.setValue(value);
return editor.getAsText();
}
if (type == URI.class) {
return ((URI)value).toString();
}
return null;
}
private static Method findSetterMethod(Class clazz, String name) {
// Build the method name.
name = "set" + name.substring(0, 1).toUpperCase() + name.substring(1);
Method[] methods = clazz.getMethods();
for (int i = 0; i < methods.length; i++) {
Method method = methods[i];
Class params[] = method.getParameterTypes();
if (method.getName().equals(name) && params.length == 1 && isSettableType(params[0])) {
return method;
}
}
return null;
}
private static boolean isSettableType(Class clazz) {
if (PropertyEditorManager.findEditor(clazz) != null) {
return true;
}
if (clazz == URI.class) {
return true;
}
if (clazz == File.class) {
return true;
}
if (clazz == File[].class) {
return true;
}
if (clazz == Boolean.class) {
return true;
}
return false;
}
public static String toString(Object target) {
return toString(target, Object.class);
}
public static String toString(Object target, Class stopClass) {
LinkedHashMap map = new LinkedHashMap();
addFields(target, target.getClass(), stopClass, map);
StringBuffer buffer = new StringBuffer(simpleName(target.getClass()));
buffer.append(" {");
Set entrySet = map.entrySet();
boolean first = true;
for (Iterator iter = entrySet.iterator(); iter.hasNext();) {
Map.Entry entry = (Map.Entry)iter.next();
if (first) {
first = false;
} else {
buffer.append(", ");
}
buffer.append(entry.getKey());
buffer.append(" = ");
appendToString(buffer, entry.getValue());
}
buffer.append("}");
return buffer.toString();
}
protected static void appendToString(StringBuffer buffer, Object value) {
buffer.append(value);
}
public static String simpleName(Class clazz) {
String name = clazz.getName();
int p = name.lastIndexOf(".");
if (p >= 0) {
name = name.substring(p + 1);
}
return name;
}
private static void addFields(Object target, Class startClass, Class