get all the properties from a Bean Class; - Java Reflection

Java examples for Reflection:Java Bean

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Description

get all the properties from a Bean Class;

Demo Code

/**/*from   www .  j  a  va  2s.c  o m*/
 *all rights reserved,@copyright 2003
 */
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.HashMap;

public class Main{
    public static void main(String[] argv) throws Exception{
        Class clz = String.class;
        System.out.println(java.util.Arrays.toString(getProperties(clz)));
    }
    public static final String PROPERTY_SET_METHOD_PREFIX = "set";
    public static final String PROPERTY_GET_METHOD_PREFIX = "get";
    public static final String PROPERTY_IS_METHOD_PREFIX = "is";
    /**
     * get all the properties from a Bean Class;
     *
     * @param clz
     * @return
     */
    public static BeanProperty[] getProperties(Class clz) {
        HashMap p = new HashMap();
        Method[] methods = clz.getMethods();
        int count = methods.length;
        for (int i = 0; i < count; i++) {
            String methodName = methods[i].getName();
            if (methodName.startsWith(PROPERTY_SET_METHOD_PREFIX)) {
                Class[] paramTypes = methods[i].getParameterTypes();
                if (paramTypes != null && paramTypes.length == 1
                        && PrimitiveType.isPrimitive(paramTypes[0])) {
                    String propName = Character.toLowerCase(methodName
                            .charAt(PROPERTY_SET_METHOD_PREFIX.length()))
                            + methodName
                                    .substring(PROPERTY_SET_METHOD_PREFIX
                                            .length() + 1);
                    BeanProperty bp = (BeanProperty) p.get(propName);
                    if (bp == null) {
                        bp = new BeanProperty(propName,
                                PrimitiveType.getTypeName(paramTypes[0]));
                        bp.setMethodName = methodName;
                        p.put(propName, bp);
                    } else {
                        if (bp.getType().equalsIgnoreCase(
                                PrimitiveType.getTypeName(paramTypes[0]))) {
                            bp.setMethodName = methodName;
                        }
                    }
                }
            } else if (methodName.startsWith(PROPERTY_GET_METHOD_PREFIX)) {
                Class[] paramTypes = methods[i].getParameterTypes();
                Class returnType = methods[i].getReturnType();
                if ((paramTypes == null || paramTypes.length == 0)
                        && PrimitiveType.isPrimitive(returnType)) {
                    String propName = Character.toLowerCase(methodName
                            .charAt(PROPERTY_SET_METHOD_PREFIX.length()))
                            + methodName
                                    .substring(PROPERTY_SET_METHOD_PREFIX
                                            .length() + 1);
                    BeanProperty bp = (BeanProperty) p.get(propName);
                    if (bp == null) {
                        bp = new BeanProperty(propName,
                                PrimitiveType.getTypeName(returnType));
                        bp.getMethodName = methodName;
                        p.put(propName, bp);
                    } else {
                        if (bp.getType().equalsIgnoreCase(
                                PrimitiveType.getTypeName(returnType))) {
                            bp.getMethodName = methodName;
                        }
                    }
                }
            } else if (methodName.startsWith(PROPERTY_IS_METHOD_PREFIX)) {
                Class[] paramTypes = methods[i].getParameterTypes();
                Class returnType = methods[i].getReturnType();
                if ((paramTypes == null || paramTypes.length == 0)
                        && PrimitiveType.isPrimitive(returnType)) {
                    String propName = Character.toLowerCase(methodName
                            .charAt(PROPERTY_SET_METHOD_PREFIX.length()))
                            + methodName
                                    .substring(PROPERTY_SET_METHOD_PREFIX
                                            .length() + 1);
                    BeanProperty bp = (BeanProperty) p.get(propName);
                    if (bp == null) {
                        bp = new BeanProperty(propName,
                                PrimitiveType.getTypeName(returnType));
                        bp.getMethodName = methodName;
                        p.put(propName, bp);
                    } else {
                        if (bp.getType().equalsIgnoreCase(
                                PrimitiveType.getTypeName(returnType))) {
                            bp.getMethodName = methodName;
                        }
                    }
                }
            }
        }
        return (BeanProperty[]) p.values().toArray(
                new BeanProperty[p.size()]);
    }
}

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