com.glaf.jbpm.util.CustomFieldInstantiator.java Source code

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Here is the source code for com.glaf.jbpm.util.CustomFieldInstantiator.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.glaf.jbpm.util;

import java.lang.reflect.Constructor;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.dom4j.Element;
import org.jbpm.instantiation.FieldInstantiator;
import org.jbpm.instantiation.Instantiator;
import org.jbpm.util.ClassLoaderUtil;

import com.glaf.core.util.DateUtils;

public class CustomFieldInstantiator extends FieldInstantiator implements Instantiator {
    private static final Log logger = LogFactory.getLog(CustomFieldInstantiator.class);

    public static Object getValue(Class<?> type, Element propertyElement) {
        Object value = null;
        if (type == String.class) {
            value = propertyElement.getText();
        } else if ((type == Integer.class) || (type == int.class)) {
            value = Integer.parseInt(propertyElement.getTextTrim());
        } else if ((type == Long.class) || (type == long.class)) {
            value = Long.parseLong(propertyElement.getTextTrim());
        } else if ((type == Float.class) || (type == float.class)) {
            value = new Float(propertyElement.getTextTrim());
        } else if ((type == Double.class) || (type == double.class)) {
            value = Double.parseDouble(propertyElement.getTextTrim());
        } else if ((type == Boolean.class) || (type == boolean.class)) {
            value = Boolean.valueOf(propertyElement.getTextTrim());
        } else if ((type == Character.class) || (type == char.class)) {
            value = Character.valueOf(propertyElement.getTextTrim().charAt(0));
        } else if ((type == Short.class) || (type == short.class)) {
            value = Short.valueOf(propertyElement.getTextTrim());
        } else if ((type == Byte.class) || (type == byte.class)) {
            value = Byte.valueOf(propertyElement.getTextTrim());
        } else if (type.isAssignableFrom(java.util.Date.class)) {
            value = DateUtils.toDate(propertyElement.getTextTrim());
        } else if (type.isAssignableFrom(List.class)) {
            value = getCollectionValue(propertyElement, new java.util.ArrayList<Object>());
        } else if (type.isAssignableFrom(Set.class)) {
            value = getCollectionValue(propertyElement, new LinkedHashSet<Object>());
        } else if (type.isAssignableFrom(Collection.class)) {
            value = getCollectionValue(propertyElement, new java.util.ArrayList<Object>());
        } else if (type.isAssignableFrom(Map.class)) {
            value = getMapValue(propertyElement, new LinkedHashMap<Object, Object>());
        } else if (type == Element.class) {
            value = propertyElement;
        } else {
            try {
                Constructor<?> constructor = type.getConstructor(new Class[] { String.class });
                if ((propertyElement.isTextOnly()) && (constructor != null)) {
                    value = constructor.newInstance(new Object[] { propertyElement.getTextTrim() });
                }
            } catch (Exception ex) {
                logger.error("couldn't parse the bean property value '" + propertyElement.asXML() + "' to a '"
                        + type.getName() + "'");
                throw new RuntimeException(ex);
            }
        }

        return value;
    }

    private static Object getMapValue(Element mapElement, Map<Object, Object> map) {
        Class<?> keyClass = String.class;
        String keyType = mapElement.attributeValue("key-type");
        if (keyType != null) {
            keyClass = ClassLoaderUtil.classForName(keyType);
        }
        Class<?> valueClass = String.class;
        String valueType = mapElement.attributeValue("value-type");
        if (valueType != null) {
            valueClass = ClassLoaderUtil.classForName(valueType);
        }
        Iterator<?> iter = mapElement.elementIterator();
        while (iter.hasNext()) {
            Element element = (Element) iter.next();
            Element keyElement = element.element("key");
            Element valueElement = element.element("value");
            Class<?> clazz = null;
            String className = element.attributeValue("value-type");
            if (className != null) {
                clazz = ClassLoaderUtil.classForName(className);
            }
            if (clazz == null) {
                clazz = valueClass;
            }
            map.put(getValue(keyClass, keyElement), getValue(clazz, valueElement));
        }
        return map;
    }

    private static Object getCollectionValue(Element collectionElement, Collection<Object> collection) {
        Class<?> elementClass = String.class;
        String elementType = collectionElement.attributeValue("element-type");
        if (elementType != null) {
            elementClass = ClassLoaderUtil.classForName(elementType);
        }
        Iterator<?> iter = collectionElement.elementIterator();
        while (iter.hasNext()) {
            Element element = (Element) iter.next();
            collection.add(getValue(elementClass, element));
        }
        return collection;
    }

}