Package freemarker.core

Source Code of freemarker.core.StringArraySequence

/*
* Copyright (c) 2003 The Visigoth Software Society. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
*
* 3. The end-user documentation included with the redistribution, if
*    any, must include the following acknowledgement:
*       "This product includes software developed by the
*        Visigoth Software Society (http://www.visigoths.org/)."
*    Alternately, this acknowledgement may appear in the software itself,
*    if and wherever such third-party acknowledgements normally appear.
*
* 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
*    project contributors may be used to endorse or promote products derived
*    from this software without prior written permission. For written
*    permission, please contact visigoths@visigoths.org.
*
* 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
*    nor may "FreeMarker" or "Visigoth" appear in their names
*    without prior written permission of the Visigoth Software Society.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED.  IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Visigoth Software Society. For more
* information on the Visigoth Software Society, please see
* http://www.visigoths.org/
*/

package freemarker.core;

import freemarker.template.SimpleScalar;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateScalarModel;
import freemarker.template.TemplateSequenceModel;

/**
* Sequence variable implementation that wraps a String[] with relatively low
* resource utilization. Warning: it does not copy the wrapped array, so do
* not modify that after the model was made!
*
* @author Daniel Dekany
* @version $Id: StringArraySequence.java,v 1.2 2004/01/06 17:06:42 szegedia Exp $
*/
public class StringArraySequence implements TemplateSequenceModel {
    private String[] stringArray;
    private TemplateScalarModel[] array;

    /**
     * Warning: Does not copy the argument array!
     */
    public StringArraySequence(String[] stringArray) {
        this.stringArray = stringArray;
    }

    public TemplateModel get(int index) {
        if (array == null) {
            array = new TemplateScalarModel[stringArray.length];
        }
        TemplateScalarModel result = array[index];
        if (result == null) {
            result = new SimpleScalar(stringArray[index]);
            array[index] = result;
        }
        return result;
    }

    public int size() {
        return stringArray.length;
    }
}
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