com.viaoa.util.OAHtml Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of oa Show documentation
Object Automation library
The newest version!
/*  Copyright 1999-2015 Vince Via [email protected]
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/
package com.viaoa.util;

import java.io.*;
import java.text.*;

import javax.swing.text.Document;
import javax.swing.text.Position;
import javax.swing.text.html.HTMLDocument;
import javax.swing.text.html.HTMLEditorKit;

import com.viaoa.html.OAHtmlComponent;

public class OAHtml {
    private String htmlText;
    private boolean bInit;
    private HTMLEditorKit kit;
    private HTMLDocument doc;
    private Reader reader;

    public OAHtml() {
        
    }
    
    public OAHtml(String htmlText) {
        setText(htmlText);
    }
    
    /**
     * Set html text
     */
    public void setText(String htmlText) {
        this.htmlText = htmlText;
        bInit = false;
    }

    /**
     * @return length of text, without markup tags.  Returns -1 if error.
     */
    public int getLength() {
        if (!init()) return -1;
        return doc.getLength();
    }
    /**
     * @return length of text, without markup tags.  Returns -1 if error.
     */
    public int length() {
        return getLength();
    }
    
    
    /**
     * 
     * @return html text
     */
    public String getText() {
        return htmlText;
    }
    
    private boolean init() {
        if (bInit || htmlText == null) return bInit;
        
        reader = new StringReader(htmlText);
        if (kit == null) kit = new HTMLEditorKit();

        doc = (HTMLDocument) kit.createDefaultDocument();
        
        try {
            kit.read(reader, doc, 0);
            bInit = true;
        }
        catch (Exception e) {
        }
        
        return bInit;
    }

    /**
     * Insert a string at a given position.  Use substring to get html document with the inserted text.
     * @param text text to insert, should not include tags.
     * @param pos
     */
    public void insert(String text, int pos) {
        if (!init()) return;
        try {
            doc.insertString(pos, text, null);
        }
        catch (Exception e) {
        }
    }
    
    
    /*
     * Get substring of html document text, which will then include html tags/attributes.
     * example: if the substring(1,3) for html doc 'abced' will return 'bc'
     */
    public String substring(int beginPos, int endPos) {
        if (!init()) return null;
        
        StringWriter w = new StringWriter(); 
        try {
            w = new StringWriter(); 
            kit.write(w, doc, beginPos+1, (endPos-beginPos)+1);
        }
        catch (Exception e) {
        }
        return w.toString();
    }

    
    
    public static void main(String[] args) throws Exception {
        String s = "A
123456789
ABCD XYZ
";
        OAHtml h = new OAHtml(s);
        s = h.substring(0, 5);
        System.out.println("==> " + s);
    }
    
    
}