Best Tools for JAVA/Best Tools for JAVA.iso/JAVA_ALL/HOTJAVA_/HOTJAVA/CLASSSRC/BROWSER/FORMTA~1.JAV

Text File | 1995-08-11 | 5.0 KB | 204 lines

/*
 * @(#)FormTagRef.java    1.15 95/04/07 Jonathan Payne
 *
 * Copyright (c) 1994 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL purposes and without
 * fee is hereby granted provided that this copyright notice
 * appears in all copies. Please refer to the file "copyright.html"
 * for further important copyright and licensing information.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 */

package browser;

import java.util.Hashtable;
import awt.RadioGroup;
import java.util.Vector;
import browser.forms.FormItem;
import net.www.html.Tag;
import net.www.html.TagRef;
import net.www.html.URL;
import browser.forms.submit;

/**
 * An instance of class FormTagRef is created for each occurrence of
 * a <form> tag in an html document.  It serves as the definition of
 * an html FORM object as it appears in an html document.
 * @version 1.15, 07 Apr 1995
 * @author Jonathan Payne
 */

public class FormTagRef extends WRTagRef {
    /**
     * The WRWindow this tag ref appears in.  This is needed to
     * perform the PushURL that is done when the form is submitted.
     */
    WRWindow    win;

    /** The vector of <input> items that appear in this form. */
    Vector    inputItems;

    /** The url of the document this form appears in. */
    URL        url;

    /**
     * The different radio groups (by name) that appear in this hash
     * table.
     */
    Hashtable    radioGroups;

    /**
     * The current textarea or select tag we're processing.
     */
    TagRef    currentInput;

    public FormTagRef(Tag t, int pos, boolean isEnd) {
    super(t, pos, isEnd);
    }

    public void apply(WRFormatter f) {
    win = (WRWindow) f.win;
    url = win.document().url();
    if (isEnd) {
        f.popForm();
    } else {
        f.pushForm(this);
    }
    }

    /**
     * Adds an input item to this form.  This is called by input
     * items which are created as a result of <input> tags that
     * appear in html documents.
     */
    public void addInputItem(FormItem item) {
    if (inputItems == null) {
        inputItems = new Vector();
    }
    inputItems.addElement(item);
    }

    /**
     * Returns the radio group associated with the specified name.
     * If there is no RadioGroup by that name, one is created.
     */
    public RadioGroup getRadioGroup(String name) {
    if (radioGroups == null) {
        radioGroups = new Hashtable();
    }

    RadioGroup  group = (RadioGroup) radioGroups.get(name);

    if (group == null) {
        group = new RadioGroup();
        radioGroups.put(name, group);
    }

    return group;
    }

    /**
     * Set the current input item tag.
     * @exception Exception if there's already a select tag
     */
    public void setInputItem(TagRef r) {
    if (currentInput != null && r != null) {
        throw new Exception("nested " + r.tag + " tags not allowed");
    }
    currentInput = r;
    }

    /**
     * Get the current select tag or return null if we're currently
     * not processing one.
     */
    public TagRef getInputItem() {
    return currentInput;
    }

    /**
     * Submits this form.  It walks through each input item asking
     * it for its FormString.  Some form items may choose not to
     * return a value.
     */
    public void submit() {
    int cnt = inputItems.size();
    int i = 0;
    String    query;
    URL    submitUrl;
    String    action = getAttribute("action");
    boolean posting;

    try {
        posting = getAttribute("method").toLowerCase().equals("post");
    } catch (NullPointerException e) {
        posting = false;
    }

    if (action != null) {
        submitUrl = new URL(url, action);
    } else {
        submitUrl = url;
    }

    query = "";

    try {
        boolean doneOne = false;

        while (--cnt >= 0) {
        FormItem    fi = (FormItem) inputItems.elementAt(i++);

        /* items without names don't get reported */
        if (fi.getName() == null) {
            continue;
        }
        String    thisResult = fi.getFormString();

        if (thisResult != null) {
            if (doneOne) {
            query += "&";
            }
            query += thisResult;
            doneOne = true;
        }
        }
        if (posting) {
        submitUrl = new URL(submitUrl, query, url);
        } else {
        /* REMIND: This belongs in class URL. */
        String    currentUrl = submitUrl.toExternalForm();
        int    questionIndex;

        if ((questionIndex = currentUrl.lastIndexOf('?')) != -1) {
            currentUrl = currentUrl.substring(0, questionIndex);
        }
        submitUrl = new URL(null, currentUrl + "?" + query);
        }
        win.pushURL(submitUrl);
    } catch (Exception e) {
        e.printStackTrace();
    }
    }

    /** Resets all the form input items to their default value. */
    public void reset() {
    int cnt = inputItems.size();
    int i = 0;

    while (--cnt >= 0) {
        FormItem    fi = (FormItem) inputItems.elementAt(i++);

        fi.reset();
    }
    }
}