kenh.xscript.elements.Accum.java Source code

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

Source

/*
 * 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 org.apache.commons.lang3.StringUtils;

import kenh.xscript.Element;
import kenh.xscript.UnsupportedScriptException;
import kenh.xscript.annotation.Attribute;
import kenh.xscript.annotation.Exclude;
import kenh.xscript.annotation.IgnoreSuperClass;
import kenh.xscript.impl.NoChildElement;

/**
 * Accumulator. It will plus a number for certain variable.
 * 
 * @author Kenneth
 * @since 1.0
 *
 */
@IgnoreSuperClass
@Exclude(Element.class)
public class Accum extends Set {

    private static final String ATTRIBUTE_VARIABLE = "var";
    private static final String ATTRIBUTE_STEP = "step";

    public void process(@Attribute(ATTRIBUTE_VARIABLE) String var) throws UnsupportedScriptException {
        process(var, 1);
    }

    public void process(@Attribute(ATTRIBUTE_VARIABLE) String var, @Attribute(ATTRIBUTE_STEP) int step)
            throws UnsupportedScriptException {
        var = StringUtils.trimToEmpty(var);

        if (StringUtils.isBlank(var)) {
            UnsupportedScriptException ex = new UnsupportedScriptException(this, "Variable name is empty.");
            throw ex;
        }

        String thisVar = var;
        if (StringUtils.contains(var, " ")) {
            thisVar = StringUtils.substringAfterLast(var, " ");
        }

        int defaultValue = 0;
        if (this.getEnvironment().containsVariable(thisVar)) {
            Object obj = this.getEnvironment().getVariable(thisVar);
            if (obj instanceof Integer) {
                defaultValue = ((Integer) obj).intValue();
            } else if (obj instanceof String) {
                if (StringUtils.isNumeric((String) obj)) {
                    defaultValue = Integer.parseInt((String) obj);
                }

            } else {
                UnsupportedScriptException ex = new UnsupportedScriptException(this,
                        "Only support integer variable.");
                throw ex;
            }
        }
        defaultValue += step;

        saveVariable(var, defaultValue, defaultValue);
    }
}