197 lines
8.9 KiB
Plaintext
197 lines
8.9 KiB
Plaintext
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package th.co.muangthai.endrprint.util;
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/**
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* Created by IntelliJ IDEA.
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* User: Zizu
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* Date: 6/25/14
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* Time: 4:16 PM
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* To change this template use File | Settings | File Templates.
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*/
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.Arrays;
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import java.util.Iterator;
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import java.util.LinkedHashSet;
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import java.util.Set;
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/**
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* This class can be used for reflection purpose. Both class should match the getter and setter.
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* @author Vijay Shegokar
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* @version 1.0
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*/
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public class ReflectionUtil {
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/**
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* This method is used to copy one bean values to another bean.
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* @param toClazz Class object of Destination bean, which will be used to create class instance to copy values from passed object
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* @param from Origin bean from where to copy values
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* @param strictCopy boolean value denoting that copy should be in strict manner or not. If this is true then null values will also copied to destination bean from origin bean
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* @throws IllegalArgumentException If passed bean is null.
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* @throws InvocationTargetException If method access is denied
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* @throws InstantiationException If not able to create an instance of an passed toClass
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* @throws IllegalAccessException If access denied to access given class
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*/
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@SuppressWarnings("unchecked")
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public static <T> T copy(Class<T> toClazz, Object from, boolean strictCopy) throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
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if (toClazz == null)
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throw new IllegalArgumentException("No destination bean specified");
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Object to = toClazz.newInstance();
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copy(to, from, strictCopy);
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return (T)to;
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}
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/**
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* This method is used to copy one bean values to another bean.
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* @param toClazz Class object of Destination bean, which will be used to create class instance to copy values from passed object
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* @param from Origin bean from where to copy values
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* @throws IllegalArgumentException If passed bean is null.
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* @throws InvocationTargetException If method access is denied
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* @throws InstantiationException If not able to create an instance of an passed toClass
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* @throws IllegalAccessException If access denied to access given class
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*/
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public static <T> T copy(Class<T> toClazz, Object from) throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
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return copy(toClazz, from, false);
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}
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/**
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* This method is used to copy one bean values to another bean.
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* @param to : Destination bean where values need to be copy from origin
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* @param from : Origin bean from where to copy values
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* @throws IllegalArgumentException If passed bean is null.
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* @throws InvocationTargetException If method access is denied
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*/
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public static void copy(final Object to, final Object from) throws IllegalArgumentException, InvocationTargetException {
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copy(to, from, false);
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}
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/**
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* This method is used to copy one bean values to another bean.
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* @param to : Origin bean from where to copy values
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* @param from : Destination bean where values need to be copy from origin
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* @param strictCopy boolean value denoting that copy should be in strict manner or not. If this is true then null values will also copied to destination bean from origin bean
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* @throws IllegalArgumentException If passed bean is null.
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* @throws InvocationTargetException If method access is denied
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*/
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synchronized public static void copy(final Object to, final Object from, boolean strictCopy) throws IllegalArgumentException, InvocationTargetException{
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// long t1 = System.currentTimeMillis();
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// System.out.println("Time Sarted : " + t1);
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// Validate existence of the specified beans
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if (to == null) {
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throw new IllegalArgumentException("No destination bean specified");
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}
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if (from == null) {
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throw new IllegalArgumentException("No origin bean specified");
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}
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try {
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Class<? extends Object> toClass = to.getClass();
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Method[] toMethods = toClass.getMethods();
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Set<Method> toMethodsList = new LinkedHashSet<Method>(Arrays.asList(toMethods));
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Class<? extends Object> fromClass = from.getClass();
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Method[] fromMethods = fromClass.getMethods();
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Set<Method> fromMethodsList = new LinkedHashSet<Method>(Arrays.asList(fromMethods));
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Iterator<Method> fromMethodsIterator = fromMethodsList.iterator();
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while(fromMethodsIterator.hasNext()) {
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Method fromMethod = fromMethodsIterator.next();
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boolean isBoolean = false;
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Class<?> returnType = fromMethod.getReturnType();
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if(fromMethod.getName().startsWith("is") && boolean.class.equals(returnType)) {
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isBoolean = true;
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}
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if (isGetter(fromMethod, isBoolean)) {
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Object value = null;
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try {
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value = fromMethod.invoke(from);
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} catch (Exception e) {
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throw new InvocationTargetException(e, "Getter method cannot have any parameter. Error on method : " + fromMethod.getName());
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}
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if(strictCopy){
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setValues(returnType, value, fromMethod, to, toMethodsList, isBoolean);
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} else {
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if(value != null) {
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setValues(returnType, value, fromMethod, to, toMethodsList, isBoolean);
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}
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}
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}
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}
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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}
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// long t2 = System.currentTimeMillis();
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// System.out.println("Time completed : " + t2);
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// System.out.println("Total Time completed : " + (t2 - t1));
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}
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/**
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* This method is used to check method is getter or not.
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* @param method Method which needs to be check
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* @param isBoolean If the given method is primitive boolean type because getter for it starts with "is".
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* @return true is method is getter
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*/
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public static boolean isGetter(Method method, boolean isBoolean) {
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if(isBoolean && !method.getName().startsWith("is"))
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return false;
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if (!isBoolean && !method.getName().startsWith("get"))
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return false;
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if (method.getParameterTypes().length != 0)
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return false;
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if (void.class.equals(method.getReturnType()))
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return false;
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return true;
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}
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/**
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* This method is used to check method is setter or not.
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* @param method Method which needs to be check
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* @return true is method is setter
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*/
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public static boolean isSetter(Method method) {
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if (!method.getName().startsWith("set"))
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return false;
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if (method.getParameterTypes().length != 1)
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return false;
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return true;
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}
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/**
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* This method set the values to destination bean
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* @param returnType Return type of from class method
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* @param value value of from class getter method to be copied to destination
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* @param fromMethod method of from class
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* @param to destination class object
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* @param toMethodsList set of to class all methods
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* @param isBoolean method return type is boolean or not
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* @throws IllegalArgumentException If passed bean is null.
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* @throws InvocationTargetException If method access is denied
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* @throws IllegalAccessException If access denied to access given class
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*/
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public static void setValues(Class<?> returnType, Object value, final Method fromMethod, final Object to, Set<Method> toMethodsList, boolean isBoolean) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException{
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if(!returnType.isPrimitive()) {
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fromMethod.getReturnType().cast(value);
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}
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Iterator<Method> toMethodsIterator = toMethodsList.iterator();
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while (toMethodsIterator.hasNext()) {
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Method toMethod = (Method) toMethodsIterator.next();
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if (isSetter(toMethod)) {
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int fromSubstringIndex = 3;
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if(isBoolean)
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fromSubstringIndex = 2;
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if(toMethod.getName().substring(3).equals(fromMethod.getName().substring(fromSubstringIndex))) {
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try {
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toMethod.invoke(to, value);
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} catch (Exception e) {
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throw new InvocationTargetException(e, "Data type mismatched or access specifier is wrong. Error on method: TO method = " + toMethod.getName() + " FROM method = " + fromMethod.getName());
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}
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toMethodsList.remove(toMethod);
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break;
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}
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}
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}
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}
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}
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