com.pureinfo.dolphin.script.lang.ScriptBlock.java Source code

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Here is the source code for com.pureinfo.dolphin.script.lang.ScriptBlock.java

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/**
 * PureInfo Dolphin
 * @(#)ScriptBlock.java   1.0 2005-8-29
 * 
 * Copyright(c) 2004-2005, PureInfo Information Technology Corp. Ltd. 
 * All rights reserved, see the license file.
 * 
 * www.pureinfo.com.cn
 */

package com.pureinfo.dolphin.script.lang;

import java.util.ArrayList;
import java.util.List;

import org.dom4j.Element;

import com.pureinfo.force.container.ContainerUtil;
import com.pureinfo.force.container.IClearable;
import com.pureinfo.force.exception.PureException;
import com.pureinfo.force.xml.IXMLSupporter;

/**
 * <P>
 * Created on 2005-8-29 22:44:50 <BR>
 * Last modified on 2005-8-29
 * </P>
 * ScriptBlock: Dolphin View script block.
 * 
 * @author Why
 * @version 1.0, 2005-8-29
 * @since Dolphin 1.0
 */
public class ScriptBlock implements IClearable, IXMLSupporter {
    //contents list: String or Expression
    private List m_contents;

    private int m_nStatementCount;

    /**
     * Constructor
     */
    public ScriptBlock() {
        super();

        m_contents = new ArrayList();
        m_nStatementCount = 0;
    }

    /**
     * @see com.pureinfo.force.container.IClearable#clear()
     */
    public void clear() {
        if (m_contents.isEmpty())
            return;

        //else
        ContainerUtil.clear(m_contents);
        m_nStatementCount = 0;
    }

    /**
     * Returns <code>true</code> if the this block has no content.
     * 
     * @return <code>true</code> if the this block has no content;
     *         <code>false</code> otherwise.
     */
    public boolean isEmpty() {
        return m_contents.isEmpty();
    }

    /**
     * Returns the contents size.
     * 
     * @return the contents size
     */
    public int size() {
        return m_contents.size();
    }

    /**
     * Returns the contents list in this block.
     * 
     * @return the contents list in this block.
     */
    public List getContents() {
        return m_contents;
    }

    /**
     * Adds a string content.
     * 
     * @param _sContent
     *            a string content.
     */
    public void addContent(String _sContent) {
        m_contents.add(_sContent);
    }

    /**
     * Adds a script statement.
     * 
     * @param _statement
     *            a script statement.
     */
    public void addContent(Statement _statement) {
        m_contents.add(_statement);
        m_nStatementCount++;
    }

    /**
     * Returns the total number of the script statements in this block.
     * 
     * @return the total number of the script statements in this block.
     */
    public int getStatementCount() {
        return m_nStatementCount;
    }

    /**
     * Returns <code>true</code> if there is one or more statements in this
     * block.
     * 
     * @return <code>true</code> if there is one or more statements in this
     *         block; <code>false</code> otherwise.
     */
    public boolean hasStatement() {
        return m_nStatementCount > 0;
    }

    /**
     * @see java.lang.Object#toString()
     */
    public String toString() {
        StringBuffer buff = new StringBuffer();
        Object content;

        try {
            for (int i = 0; i < m_contents.size(); i++) {
                content = m_contents.get(i);
                if (content instanceof String) {
                    buff.append((String) content);
                } else {
                    buff.append(content.toString());
                }
            }
            return buff.toString();
        } finally {
            buff.setLength(0);
        }
    }

    //=========================================================================
    //implementation for IXMLSupporter

    /**
     * @see com.pureinfo.force.xml.IXMLSupporter#toXMLElement(org.dom4j.Element)
     */
    public void toXMLElement(Element _element) throws PureException {
        Object content;
        Element element;
        for (int i = 0; i < m_contents.size(); i++) {
            content = m_contents.get(i);
            if (content instanceof String) {
                element = _element.addElement("text");
                element.addCDATA((String) content);
            } else {
                element = _element.addElement("stmt");
                ((IXMLSupporter) content).toXMLElement(element);
            }
        }
    }

    /**
     * @see com.pureinfo.force.xml.IXMLSupporter#fromXML(org.dom4j.Element)
     */
    public void fromXML(Element _element) throws PureException {
        List children = _element.elements();
        if (children == null || children.isEmpty())
            return;

        Element element;
        String sName;
        Statement statement;
        for (int i = 0; i < children.size(); i++) {
            element = (Element) children.get(i);
            sName = element.getName();
            if (sName.equals("statement")) {
                this.addContent(element.getText());
            } else {
                statement = new Statement();
                statement.fromXML(element);
                this.addContent(statement);
            }
        }
    }

}