org.echocat.redprecursor.annotations.utils.MapPropertyAccessor.java Source code

Introduction

Here is the source code for org.echocat.redprecursor.annotations.utils.MapPropertyAccessor.java

Source

/*****************************************************************************************
 * *** BEGIN LICENSE BLOCK *****
 *
 * Version: MPL 2.0
 *
 * echocat RedPrecursor, Copyright (c) 2011-2012 echocat
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * *** END LICENSE BLOCK *****
 ****************************************************************************************/

package org.echocat.redprecursor.annotations.utils;

import org.springframework.expression.AccessException;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.PropertyAccessor;
import org.springframework.expression.TypedValue;

import java.util.Map;

public class MapPropertyAccessor implements PropertyAccessor {

    @Override
    public Class<?>[] getSpecificTargetClasses() {
        return new Class<?>[] { Map.class };
    }

    @Override
    public boolean canRead(EvaluationContext context, Object target, String name) throws AccessException {
        return target instanceof Map;
    }

    @Override
    public TypedValue read(EvaluationContext context, Object target, String name) throws AccessException {
        final Object plainValue = target instanceof Map ? ((Map) target).get(name) : null;
        return plainValue != null ? new TypedValue(plainValue) : TypedValue.NULL;
    }

    @Override
    public boolean canWrite(EvaluationContext context, Object target, String name) throws AccessException {
        return target instanceof Map;
    }

    @Override
    public void write(EvaluationContext context, Object target, String name, Object newValue)
            throws AccessException {
        if (target instanceof Map) {
            // noinspection unchecked
            ((Map) target).put(name, newValue);
        }
    }
}