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Groovy: A powerful, dynamic language for the JVM
/*
* 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 groovy.inspect;
import groovy.lang.GroovyObject;
import groovy.lang.MetaClass;
import groovy.lang.MetaMethod;
import groovy.lang.PropertyValue;
import org.codehaus.groovy.reflection.CachedClass;
import org.codehaus.groovy.runtime.DefaultGroovyMethods;
import org.codehaus.groovy.runtime.InvokerHelper;
import java.io.PrintStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.*;
/**
* The Inspector provides a unified access to an object's
* information that can be determined by introspection.
*
* @author Dierk Koenig
*/
public class Inspector {
protected Object objectUnderInspection;
// Indexes to retrieve Class Property information
public static final int CLASS_PACKAGE_IDX = 0;
public static final int CLASS_CLASS_IDX = 1;
public static final int CLASS_INTERFACE_IDX = 2;
public static final int CLASS_SUPERCLASS_IDX = 3;
public static final int CLASS_OTHER_IDX = 4;
// Indexes to retrieve field and method information
public static final int MEMBER_ORIGIN_IDX = 0;
public static final int MEMBER_MODIFIER_IDX = 1;
public static final int MEMBER_DECLARER_IDX = 2;
public static final int MEMBER_TYPE_IDX = 3;
public static final int MEMBER_NAME_IDX = 4;
public static final int MEMBER_PARAMS_IDX = 5;
public static final int MEMBER_VALUE_IDX = 5;
public static final int MEMBER_EXCEPTIONS_IDX = 6;
public static final String NOT_APPLICABLE = "n/a";
public static final String GROOVY = "GROOVY";
public static final String JAVA = "JAVA";
/**
* @param objectUnderInspection must not be null
*/
public Inspector(Object objectUnderInspection) {
if (null == objectUnderInspection) {
throw new IllegalArgumentException("argument must not be null");
}
this.objectUnderInspection = objectUnderInspection;
}
/**
* Get the Class Properties of the object under inspection.
*
* @return String array to be indexed by the CLASS_xxx_IDX constants
*/
public String[] getClassProps() {
String[] result = new String[CLASS_OTHER_IDX + 1];
Package pack = getClassUnderInspection().getPackage();
result[CLASS_PACKAGE_IDX] = "package " + ((pack == null) ? NOT_APPLICABLE : pack.getName());
String modifiers = Modifier.toString(getClassUnderInspection().getModifiers());
result[CLASS_CLASS_IDX] = modifiers + " class " + shortName(getClassUnderInspection());
result[CLASS_INTERFACE_IDX] = "implements ";
Class[] interfaces = getClassUnderInspection().getInterfaces();
for (Class anInterface : interfaces) {
result[CLASS_INTERFACE_IDX] += shortName(anInterface) + " ";
}
result[CLASS_SUPERCLASS_IDX] = "extends " + shortName(getClassUnderInspection().getSuperclass());
result[CLASS_OTHER_IDX] = "is Primitive: " + getClassUnderInspection().isPrimitive()
+ ", is Array: " + getClassUnderInspection().isArray()
+ ", is Groovy: " + isGroovy();
return result;
}
public boolean isGroovy() {
return GroovyObject.class.isAssignableFrom(getClassUnderInspection());
}
/**
* Gets the object being inspected.
*
* @return the object
*/
public Object getObject() {
return objectUnderInspection;
}
/**
* Get info about usual Java instance and class Methods as well as Constructors.
*
* @return Array of StringArrays that can be indexed with the MEMBER_xxx_IDX constants
*/
public Object[] getMethods() {
Method[] methods = getClassUnderInspection().getMethods();
Constructor[] ctors = getClassUnderInspection().getConstructors();
Object[] result = new Object[methods.length + ctors.length];
int resultIndex = 0;
for (; resultIndex < methods.length; resultIndex++) {
Method method = methods[resultIndex];
result[resultIndex] = methodInfo(method);
}
for (int i = 0; i < ctors.length; i++, resultIndex++) {
Constructor ctor = ctors[i];
result[resultIndex] = methodInfo(ctor);
}
return result;
}
/**
* Get info about instance and class Methods that are dynamically added through Groovy.
*
* @return Array of StringArrays that can be indexed with the MEMBER_xxx_IDX constants
*/
public Object[] getMetaMethods() {
MetaClass metaClass = InvokerHelper.getMetaClass(objectUnderInspection);
List metaMethods = metaClass.getMetaMethods();
Object[] result = new Object[metaMethods.size()];
int i = 0;
for (Iterator iter = metaMethods.iterator(); iter.hasNext(); i++) {
MetaMethod metaMethod = (MetaMethod) iter.next();
result[i] = methodInfo(metaMethod);
}
return result;
}
/**
* Get info about usual Java public fields incl. constants.
*
* @return Array of StringArrays that can be indexed with the MEMBER_xxx_IDX constants
*/
public Object[] getPublicFields() {
Field[] fields = getClassUnderInspection().getFields();
Object[] result = new Object[fields.length];
for (int i = 0; i < fields.length; i++) {
Field field = fields[i];
result[i] = fieldInfo(field);
}
return result;
}
/**
* Get info about Properties (Java and Groovy alike).
*
* @return Array of StringArrays that can be indexed with the MEMBER_xxx_IDX constants
*/
public Object[] getPropertyInfo() {
List props = DefaultGroovyMethods.getMetaPropertyValues(objectUnderInspection);
Object[] result = new Object[props.size()];
int i = 0;
for (Iterator iter = props.iterator(); iter.hasNext(); i++) {
PropertyValue pv = (PropertyValue) iter.next();
result[i] = fieldInfo(pv);
}
return result;
}
protected String[] fieldInfo(Field field) {
String[] result = new String[MEMBER_VALUE_IDX + 1];
result[MEMBER_ORIGIN_IDX] = JAVA;
result[MEMBER_MODIFIER_IDX] = Modifier.toString(field.getModifiers());
result[MEMBER_DECLARER_IDX] = shortName(field.getDeclaringClass());
result[MEMBER_TYPE_IDX] = shortName(field.getType());
result[MEMBER_NAME_IDX] = field.getName();
try {
result[MEMBER_VALUE_IDX] = InvokerHelper.inspect(field.get(objectUnderInspection));
} catch (IllegalAccessException e) {
result[MEMBER_VALUE_IDX] = NOT_APPLICABLE;
}
return withoutNulls(result);
}
protected String[] fieldInfo(PropertyValue pv) {
String[] result = new String[MEMBER_VALUE_IDX + 1];
result[MEMBER_ORIGIN_IDX] = GROOVY;
result[MEMBER_MODIFIER_IDX] = "public";
result[MEMBER_DECLARER_IDX] = NOT_APPLICABLE;
result[MEMBER_TYPE_IDX] = shortName(pv.getType());
result[MEMBER_NAME_IDX] = pv.getName();
try {
result[MEMBER_VALUE_IDX] = InvokerHelper.inspect(pv.getValue());
} catch (Exception e) {
result[MEMBER_VALUE_IDX] = NOT_APPLICABLE;
}
return withoutNulls(result);
}
protected Class getClassUnderInspection() {
return objectUnderInspection.getClass();
}
public static String shortName(Class clazz) {
if (null == clazz) return NOT_APPLICABLE;
String className = clazz.getName();
if (null == clazz.getPackage()) return className;
String packageName = clazz.getPackage().getName();
int offset = packageName.length();
if (offset > 0) offset++;
className = className.substring(offset);
return className;
}
protected String[] methodInfo(Method method) {
String[] result = new String[MEMBER_EXCEPTIONS_IDX + 1];
int mod = method.getModifiers();
result[MEMBER_ORIGIN_IDX] = JAVA;
result[MEMBER_DECLARER_IDX] = shortName(method.getDeclaringClass());
result[MEMBER_MODIFIER_IDX] = Modifier.toString(mod);
result[MEMBER_NAME_IDX] = method.getName();
result[MEMBER_TYPE_IDX] = shortName(method.getReturnType());
Class[] params = method.getParameterTypes();
StringBuilder sb = new StringBuilder();
for (int j = 0; j < params.length; j++) {
sb.append(shortName(params[j]));
if (j < (params.length - 1)) sb.append(", ");
}
result[MEMBER_PARAMS_IDX] = sb.toString();
sb.setLength(0);
Class[] exceptions = method.getExceptionTypes();
for (int k = 0; k < exceptions.length; k++) {
sb.append(shortName(exceptions[k]));
if (k < (exceptions.length - 1)) sb.append(", ");
}
result[MEMBER_EXCEPTIONS_IDX] = sb.toString();
return withoutNulls(result);
}
protected String[] methodInfo(Constructor ctor) {
String[] result = new String[MEMBER_EXCEPTIONS_IDX + 1];
int mod = ctor.getModifiers();
result[MEMBER_ORIGIN_IDX] = JAVA;
result[MEMBER_MODIFIER_IDX] = Modifier.toString(mod);
result[MEMBER_DECLARER_IDX] = shortName(ctor.getDeclaringClass());
result[MEMBER_TYPE_IDX] = shortName(ctor.getDeclaringClass());
result[MEMBER_NAME_IDX] = ctor.getName();
Class[] params = ctor.getParameterTypes();
StringBuilder sb = new StringBuilder();
for (int j = 0; j < params.length; j++) {
sb.append(shortName(params[j]));
if (j < (params.length - 1)) sb.append(", ");
}
result[MEMBER_PARAMS_IDX] = sb.toString();
sb.setLength(0);
Class[] exceptions = ctor.getExceptionTypes();
for (int k = 0; k < exceptions.length; k++) {
sb.append(shortName(exceptions[k]));
if (k < (exceptions.length - 1)) sb.append(", ");
}
result[MEMBER_EXCEPTIONS_IDX] = sb.toString();
return withoutNulls(result);
}
protected String[] methodInfo(MetaMethod method) {
String[] result = new String[MEMBER_EXCEPTIONS_IDX + 1];
int mod = method.getModifiers();
result[MEMBER_ORIGIN_IDX] = GROOVY;
result[MEMBER_MODIFIER_IDX] = Modifier.toString(mod);
result[MEMBER_DECLARER_IDX] = shortName(method.getDeclaringClass().getTheClass());
result[MEMBER_TYPE_IDX] = shortName(method.getReturnType());
result[MEMBER_NAME_IDX] = method.getName();
CachedClass[] params = method.getParameterTypes();
StringBuilder sb = new StringBuilder();
for (int j = 0; j < params.length; j++) {
sb.append(shortName(params[j].getTheClass()));
if (j < (params.length - 1)) sb.append(", ");
}
result[MEMBER_PARAMS_IDX] = sb.toString();
result[MEMBER_EXCEPTIONS_IDX] = NOT_APPLICABLE; // no exception info for Groovy MetaMethods
return withoutNulls(result);
}
protected String[] withoutNulls(String[] toNormalize) {
for (int i = 0; i < toNormalize.length; i++) {
String s = toNormalize[i];
if (null == s) toNormalize[i] = NOT_APPLICABLE;
}
return toNormalize;
}
public static void print(Object[] memberInfo) {
print(System.out, memberInfo);
}
static void print(final PrintStream out, Object[] memberInfo) {
for (int i = 0; i < memberInfo.length; i++) {
String[] metaMethod = (String[]) memberInfo[i];
out.print(i + ":\t");
for (String s : metaMethod) {
out.print(s + " ");
}
out.println("");
}
}
public static Collection sort(List