cssstyleruleimpl.java

cssparser -- CSS 的语法解析器。采用java语言编写。可用在服务端生成页面。

/*
 * CSSStyleRuleImpl.java
 *
 * Steady State CSS2 Parser
 *
 * Copyright (C) 1999, 2002 Steady State Software Ltd.  All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * To contact the authors of the library, write to Steady State Software Ltd.,
 * 49 Littleworth, Wing, Buckinghamshire, LU7 0JX, England
 *
 * http://www.steadystate.com/css/
 * mailto:[e-mail]
 *
 * $Id: CSSStyleRuleImpl.java,v 1.1.1.1 2003/12/28 21:22:51 davidsch Exp $
 */

package com.steadystate.css.dom;

import java.io.IOException;
import java.io.Serializable;
import java.io.StringReader;
import org.w3c.dom.*;
import org.w3c.dom.css.*;
import org.w3c.css.sac.*;
import com.steadystate.css.parser.*;

/** 
 *
 * @author  David Schweinsberg
 * @version $Release$
 */
public class CSSStyleRuleImpl implements CSSStyleRule, Serializable {

    private CSSStyleSheetImpl _parentStyleSheet = null;
    private CSSRule _parentRule = null;
    private SelectorList _selectors = null;
    private CSSStyleDeclaration _style = null;

    public CSSStyleRuleImpl(CSSStyleSheetImpl parentStyleSheet, CSSRule parentRule, SelectorList selectors) {
        _parentStyleSheet = parentStyleSheet;
        _parentRule = parentRule;
        _selectors = selectors;
    }

    public short getType() {
        return STYLE_RULE;
    }

    public String getCssText() {
        return getSelectorText() + " " + getStyle().toString();
    }

    public void setCssText(String cssText) throws DOMException {
        if (_parentStyleSheet != null && _parentStyleSheet.isReadOnly()) {
            throw new DOMExceptionImpl(
                DOMException.NO_MODIFICATION_ALLOWED_ERR,
                DOMExceptionImpl.READ_ONLY_STYLE_SHEET);
        }

        try {
            InputSource is = new InputSource(new StringReader(cssText));
            CSSOMParser parser = new CSSOMParser();
            CSSRule r = parser.parseRule(is);

            // The rule must be a style rule
            if (r.getType() == CSSRule.STYLE_RULE) {
                _selectors = ((CSSStyleRuleImpl)r)._selectors;
                _style = ((CSSStyleRuleImpl)r)._style;
            } else {
                throw new DOMExceptionImpl(
                    DOMException.INVALID_MODIFICATION_ERR,
                    DOMExceptionImpl.EXPECTING_STYLE_RULE);
            }
        } catch (CSSException e) {
            throw new DOMExceptionImpl(
                DOMException.SYNTAX_ERR,
                DOMExceptionImpl.SYNTAX_ERROR,
                e.getMessage());
        } catch (IOException e) {
            throw new DOMExceptionImpl(
                DOMException.SYNTAX_ERR,
                DOMExceptionImpl.SYNTAX_ERROR,
                e.getMessage());
        }
    }

    public CSSStyleSheet getParentStyleSheet() {
        return _parentStyleSheet;
    }

    public CSSRule getParentRule() {
        return _parentRule;
    }

    public String getSelectorText() {
        return _selectors.toString();
    }

    public void setSelectorText(String selectorText) throws DOMException {
        if (_parentStyleSheet != null && _parentStyleSheet.isReadOnly()) {
            throw new DOMExceptionImpl(
                DOMException.NO_MODIFICATION_ALLOWED_ERR,
                DOMExceptionImpl.READ_ONLY_STYLE_SHEET );
        }

        try {
            InputSource is = new InputSource(new StringReader(selectorText));
            CSSOMParser parser = new CSSOMParser();
            _selectors = parser.parseSelectors(is);
        } catch (CSSException e) {
            throw new DOMExceptionImpl(
                DOMException.SYNTAX_ERR,
                DOMExceptionImpl.SYNTAX_ERROR,
                e.getMessage());
        } catch (IOException e) {
            throw new DOMExceptionImpl(
                DOMException.SYNTAX_ERR,
                DOMExceptionImpl.SYNTAX_ERROR,
                e.getMessage());
        }
    }

    public CSSStyleDeclaration getStyle() {
        return _style;
    }

    public void setStyle(CSSStyleDeclarationImpl style) {
        _style = style;
    }
    
    public String toString() {
        return getCssText();
    }
}