com.jsen.javascript.java.HostedJavaCollection.java Source code

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Here is the source code for com.jsen.javascript.java.HostedJavaCollection.java

Source

/**
 * HostedJavaCollection.java
 * (c) Radim Loskot and Radek Burget, 2013-2014
 *
 * ScriptBox 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.
 *  
 * ScriptBox 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 ScriptBox. If not, see <http://www.gnu.org/licenses/>.
 * 
 */

package com.jsen.javascript.java;

import java.lang.reflect.Method;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.ClassUtils;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.Undefined;

import com.jsen.core.exceptions.InternalException;
import com.jsen.core.reflect.ObjectMembers;

/**
 * Extends hosted Java object class about accessing the collection 
 * items via indexed or mapped properties.
 * 
 * @author Radim Loskot
 * @version 0.9
 * @since 0.9 - 21.4.2014
 */
public class HostedJavaCollection extends HostedJavaObject {
    private static final long serialVersionUID = -369637419233477403L;

    protected Class<?> javaObjectType;

    /**
     * Constructs new hosted Java collection.
     * 
     * @param scope Parent scope where to place this hosted object.
     * @param objectMembers Object members.
     */
    public HostedJavaCollection(Scriptable scope, ObjectMembers objectMembers) {
        super(scope, objectMembers);
    }

    public HostedJavaCollection(Scriptable scope, Object object) {
        super(scope, object);
    }

    @Override
    public Object get(int index, Scriptable start) {
        Object object;

        object = super.get(index, start);
        object = (object == Scriptable.NOT_FOUND) ? collectionGet(index) : object;

        return customFinalizeGet(object);
    }

    @Override
    public Object get(String name, Scriptable start) {
        Object object;

        object = super.get(name, start);
        object = (object == Scriptable.NOT_FOUND) ? collectionGet(name) : object;

        return customFinalizeGet(object);
    }

    /**
     * Locates the value for a given key.
     * 
     * @param key Key that should be located.
     * @return If this object wraps the collection then returns the value of the collection using given key, otherwise null.
     */
    protected Object collectionGet(Object key) {
        Method method = null;
        Object result = Scriptable.NOT_FOUND;

        Object collectionObject = (object instanceof ArrayWrapper) ? ((ArrayWrapper) object).unwrap() : object;
        Class<?> javaObjectType = collectionObject.getClass();
        if (collectionObject instanceof List<?> && key instanceof Integer) {
            try {
                method = ClassUtils.getPublicMethod(javaObjectType, "get", int.class);
            } catch (Exception e) {
                throw new InternalException(e);
            }
            List<?> list = (List<?>) collectionObject;
            int index = (Integer) key;
            result = (list.size() > index) ? list.get((Integer) key) : Scriptable.NOT_FOUND;
        } else if (collectionObject instanceof Map<?, ?>) {
            try {
                method = ClassUtils.getPublicMethod(javaObjectType, "get", Object.class);
            } catch (Exception e) {
                throw new InternalException(e);
            }
            result = ((Map<?, ?>) collectionObject).get(key);
        }

        return result;
    }

    @Override
    protected Object finalizeGet(Object result) {
        return result;
    }

    protected Object customFinalizeGet(Object result) {
        if (result != Scriptable.NOT_FOUND) {
            return wrapObject(result);
        } else {
            return Undefined.instance;
        }
    }

}