org.jspresso.framework.util.accessor.bean.BeanCollectionAccessor.java Source code

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Here is the source code for org.jspresso.framework.util.accessor.bean.BeanCollectionAccessor.java

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/*
 * Copyright (c) 2005-2016 Vincent Vandenschrick. All rights reserved.
 *
 *  This file is part of the Jspresso framework.
 *
 *  Jspresso 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.
 *
 *  Jspresso 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 Jspresso.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.jspresso.framework.util.accessor.bean;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.apache.commons.beanutils.MethodUtils;
import org.jspresso.framework.util.accessor.ICollectionAccessor;
import org.jspresso.framework.util.bean.AccessorInfo;

/**
 * This class is the default implementation of collection property accessors.
 *
 * @author Vincent Vandenschrick
 */
public class BeanCollectionAccessor extends BeanPropertyAccessor implements ICollectionAccessor {

    private Method adderMethod;
    private final Class<?> elementClass;
    private Method removerMethod;

    /**
     * Constructs a new default java bean collection property accessor.
     *
     * @param property
     *          the property to be accessed.
     * @param beanClass
     *          the java bean class.
     * @param elementClass
     *          the collection element class.
     */
    public BeanCollectionAccessor(String property, Class<?> beanClass, Class<?> elementClass) {
        super(property, beanClass);
        this.elementClass = elementClass;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void addToValue(Object target, Object value) throws IllegalAccessException, InvocationTargetException {
        if (adderMethod == null) {
            adderMethod = MethodUtils.getMatchingAccessibleMethod(getBeanClass(),
                    AccessorInfo.ADDER_PREFIX + capitalizeFirst(getProperty()),
                    new Class<?>[] { getElementClass() });
        }
        try {
            adderMethod.invoke(getLastNestedTarget(target, getProperty()), value);
        } catch (InvocationTargetException ex) {
            if (ex.getCause() instanceof RuntimeException) {
                throw (RuntimeException) ex.getCause();
            }
            throw ex;
        } catch (IllegalArgumentException | NoSuchMethodException ex) {
            throw new RuntimeException(ex);
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void removeFromValue(Object target, Object value)
            throws IllegalAccessException, InvocationTargetException {
        if (removerMethod == null) {
            removerMethod = MethodUtils.getMatchingAccessibleMethod(getBeanClass(),
                    AccessorInfo.REMOVER_PREFIX + capitalizeFirst(getProperty()),
                    new Class<?>[] { getElementClass() });
        }
        try {
            removerMethod.invoke(getLastNestedTarget(target, getProperty()), value);
        } catch (InvocationTargetException ex) {
            if (ex.getCause() instanceof RuntimeException) {
                throw (RuntimeException) ex.getCause();
            }
            throw ex;
        } catch (IllegalArgumentException | NoSuchMethodException ex) {
            throw new RuntimeException(ex);
        }
    }

    /**
     * Capitalizes the first character of a string.
     *
     * @param input
     *          the string to capitalize the first character.
     * @return the transformed string.
     */
    protected String capitalizeFirst(String input) {
        return Character.toUpperCase(input.charAt(0)) + input.substring(1);
    }

    /**
     * Gets the elementClass.
     *
     * @return the elementClass.
     */
    protected Class<?> getElementClass() {
        return elementClass;
    }

}