lucee.runtime.reflection.storage.WeakFieldStorage.java Source code

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Here is the source code for lucee.runtime.reflection.storage.WeakFieldStorage.java

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/**
 *
 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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 library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 **/
package lucee.runtime.reflection.storage;

import java.lang.reflect.Field;
import java.util.WeakHashMap;

import lucee.runtime.type.Struct;
import lucee.runtime.type.StructImpl;

import org.apache.commons.collections.map.ReferenceMap;

/**
 * Method Storage Class
 */
public final class WeakFieldStorage {
    private WeakHashMap map = new WeakHashMap(ReferenceMap.SOFT, ReferenceMap.SOFT);

    /**
     * returns all fields matching given criteria or null if field does exist
     * @param clazz clazz to get field from
     * @param fieldname Name of the Field to get
     * @return matching Fields as Array
     */
    public synchronized Field[] getFields(Class clazz, String fieldname) {
        Object o = map.get(clazz);
        Struct fieldMap;
        if (o == null) {
            fieldMap = store(clazz);
        } else
            fieldMap = (Struct) o;

        o = fieldMap.get(fieldname, null);
        if (o == null)
            return null;
        return (Field[]) o;

    }

    /**
     * store a class with his methods
     * @param clazz
     * @return returns stored Struct
     */
    private StructImpl store(Class clazz) {
        Field[] fieldsArr = clazz.getFields();
        StructImpl fieldsMap = new StructImpl();
        for (int i = 0; i < fieldsArr.length; i++) {
            storeField(fieldsArr[i], fieldsMap);
        }
        map.put(clazz, fieldsMap);
        return fieldsMap;
    }

    /**
     * stores a single method
     * @param field
     * @param fieldsMap
     */
    private void storeField(Field field, StructImpl fieldsMap) {
        String fieldName = field.getName();
        Object o = fieldsMap.get(fieldName, null);
        Field[] args;
        if (o == null) {
            args = new Field[1];
            fieldsMap.setEL(fieldName, args);
        } else {
            Field[] fs = (Field[]) o;
            args = new Field[fs.length + 1];
            for (int i = 0; i < fs.length; i++) {
                fs[i].setAccessible(true);
                args[i] = fs[i];
            }
            fieldsMap.setEL(fieldName, args);
        }
        args[args.length - 1] = field;
    }

}