dk.apaq.framework.criteria.rules.BeanFiltrationItem Maven / Gradle / Ivy

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/*
 * CrudContainer
 * Copyright (C) 2011 by Apaq
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 */
package dk.apaq.framework.criteria.rules;


import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import dk.apaq.framework.criteria.Rule.FiltrationItem;

/**
 *
 */
public class BeanFiltrationItem implements FiltrationItem {

    private static final String[] GETTERTYPES = {"get", "is", "has"};
    private final T bean;

    public BeanFiltrationItem(T bean) {
        this.bean = bean;
    }

    @Override
    public Object getFiltrationProperty(String propertyId) {
        String preparedId = capitalize(propertyId);
        Method method = null;

        for (String type : GETTERTYPES) {
            method = lookupGetterMethod(type + preparedId);
            if (method != null) {
                break;
            }
        }

        if (method != null) {
            return invoke(method);
        }

        return null;

    }

    public T getBean() {
        return bean;
    }

    private String capitalize(String value) {
        if (value.length() == 0) {
            return value;
        }

        if (value.length() == 1) {
            return value.toUpperCase();
        }

        return value.substring(0, 1).toUpperCase() + value.substring(1);
    }

    private Object invoke(Method method) {
        try {
            return method.invoke(this.bean);
        } catch (IllegalAccessException ex) {
            return null;
        } catch (IllegalArgumentException ex) {
            return null;
        } catch (InvocationTargetException ex) {
            return null;
        }
    }

    private Method lookupGetterMethod(String name) {
        try {
            return bean.getClass().getMethod(name);
        } catch (NoSuchMethodException ex) {
            return null;
        } catch (SecurityException ex) {
            return null;
        }
    }
}