kenh.xscript.elements.If.java Source code

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Here is the source code for kenh.xscript.elements.If.java

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/*
 * xScript (XML Script Language)
 * Copyright 2015 and beyond, Kenneth Huang
 * 
 * This file is part of xScript.
 * 
 * xScript is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * as published by the Free Software Foundation.
 * 
 * xScript 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 xScript.  If not, see <http://www.gnu.org/licenses/>. 
 */

package kenh.xscript.elements;

import kenh.expl.UnsupportedExpressionException;
import kenh.xscript.annotation.*;
import kenh.xscript.impl.*;
import kenh.xscript.*;

import java.util.*;

import org.apache.commons.lang3.StringUtils;

/**
 * If element.
 * 
 * @author Kenneth
 * @since 1.0
 *
 */
@kenh.xscript.annotation.Include(value = { Then.class, Else.class }, number = { 1, 1 })
@Exclude({ Script.class, Method.class, Include.class })
public class If extends BaseElement {

    private static final String ATTRIBUTE_CONDITION = "cond";

    public int process(@Reparse @Attribute(ATTRIBUTE_CONDITION) boolean cond) throws UnsupportedScriptException {
        Element e = this.getChild(Then.class);
        if (e == null) {
            throw new UnsupportedScriptException(this, "Missing <then> element.");
        }
        if (cond) {
            return e.invoke();
        } else {
            e = this.getChild(Else.class);
            if (e == null)
                return NONE;
            else
                return e.invoke();
        }

    }

    private Element getChild(Class c) {
        Vector<Element> elements = this.getChildren();
        for (Element e : elements) {
            if (c.isAssignableFrom(e.getClass()))
                return e;
        }

        return null;
    }

}