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This project was born out of a need to validate all POJOs (Plain Old Java Object) are behaving correctly. This project has two main aspects to it: * Make Testing as easy as possible. * Simplifying identity management (hashCode / equals) using annotation.
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/**
 * Copyright (C) 2010 Osman Shoukry
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this program.  If not, see .
 */
package com.openpojo.reflection.impl;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;

import com.openpojo.reflection.PojoField;
import com.openpojo.reflection.PojoMethod;
import com.openpojo.reflection.exception.ReflectionException;
import com.openpojo.reflection.utils.ToStringHelper;

/**
 * This is the default implementation for PojoField Interface.
 * This is an immutable object and is not supposed to be created directly.
 * see {@link PojoClassFactory}
 *
 * @author oshoukry
 */
class PojoFieldImpl implements PojoField {

    private final Field field;
    private final PojoMethod fieldGetter;
    private final PojoMethod fieldSetter;

    PojoFieldImpl(final Field field) {
        this.field = field;
        this.field.setAccessible(true);
        fieldGetter = PojoMethodFactory.getFieldGetter(field);
        fieldSetter = PojoMethodFactory.getFieldSetter(field);
    }

    public Object get(final Object instance) {
        try {
            return field.get(instance);
        } catch (IllegalArgumentException e) {
            throw ReflectionException.getInstance(e.getMessage(), e);
        } catch (IllegalAccessException e) {
            throw ReflectionException.getInstance(e.getMessage(), e);
        } catch (NullPointerException e) {
            throw ReflectionException.getInstance(e.getMessage(), e);
        }
    }

    public String getName() {
        return field.getName();
    }

    public void set(final Object instance, final Object value) {
        try {
            field.set(instance, value);
        } catch (IllegalArgumentException e) {
            throw ReflectionException.getInstance(e.getMessage(), e);
        } catch (IllegalAccessException e) {
            throw ReflectionException.getInstance(e.getMessage(), e);
        } catch (NullPointerException e) {
            throw ReflectionException.getInstance(e.getMessage(), e);
        }
    }

    public boolean hasGetter() {
        return fieldGetter != null;
    }

    public Object invokeGetter(final Object instance) {
        try {
            return fieldGetter.invoke(instance, (Object[]) null);
        } catch (NullPointerException e) {
            throw ReflectionException.getInstance(e.getMessage(), e);
        }

    }

    public boolean hasSetter() {
        return fieldSetter != null;
    }

    public void invokeSetter(final Object instance, final Object value) {
        try {
            fieldSetter.invoke(instance, value);
        } catch (NullPointerException e) {
            throw ReflectionException.getInstance(e.getMessage(), e);
        }

    }

    public Class getType() {
        return field.getType();
    }

    public boolean isParameterized() {
        Type type = field.getGenericType();
        if (type instanceof ParameterizedType) {
            return true;
        }
        return false;
    }

    public List getParameterTypes() {
        List genericTypes = new LinkedList();
        if (isParameterized()) {
            ParameterizedType parameterizedType = (ParameterizedType) field.getGenericType();
            for (Type actualType : parameterizedType.getActualTypeArguments()) {
                genericTypes.add(actualType);
            }
        }
        return genericTypes;
    }

    public  T getAnnotation(final Class annotationClass) {
        return field.getAnnotation(annotationClass);
    }

    public List getAnnotations() {
        return Arrays.asList(field.getAnnotations());
    }

    public boolean isPrimitive() {
        return getType().isPrimitive();
    }

    public boolean isFinal() {
        return Modifier.isFinal(field.getModifiers());
    }

    public boolean isStatic() {
        return Modifier.isStatic(field.getModifiers());
    }

    public boolean isPrivate() {
        return Modifier.isPrivate(field.getModifiers());
    }

    public boolean isProtected() {
        return Modifier.isProtected(field.getModifiers());
    }

    public boolean isPublic() {
        return Modifier.isPublic(field.getModifiers());
    }

    public boolean isTransient() {
        return Modifier.isTransient(field.getModifiers());
    }

    public boolean isVolatile() {
        return Modifier.isVolatile(field.getModifiers());
    }

    @Override
    public String toString() {
        return String.format("PojoFieldImpl [field=%s, fieldGetter=%s, fieldSetter=%s]", field, fieldGetter,
                fieldSetter);
    }

    public String toString(final Object instance) {
        return ToStringHelper.nameValuePair(getName(), get(instance));
    }
}