phrase.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

            Element element = (Element) o;
            switch(element.type()) {
                case Element.CHUNK:
                    return addChunk((Chunk) o);
                case Element.PHRASE:
                case Element.PARAGRAPH:
                    Phrase phrase = (Phrase) o;
                    boolean success = true;
                    Element e;
                    for (Iterator i = phrase.iterator(); i.hasNext(); ) {
                        e = (Element) i.next();
                        if (e instanceof Chunk) {
                            success &= addChunk((Chunk)e);
                        }
                        else {
                            success &= this.add(e);
                        }
                    }
                    return success;
                case Element.MARKED:
                case Element.ANCHOR:
                case Element.ANNOTATION:
                case Element.TABLE: // case added by David Freels
                case Element.PTABLE: // case added by mr. Karen Vardanyan
                	// This will only work for PDF!!! Not for RTF/HTML
                case Element.LIST:
                	return super.add(o);
                    default:
                        throw new ClassCastException(String.valueOf(element.type()));
            }
        }
        catch(ClassCastException cce) {
            throw new ClassCastException("Insertion of illegal Element: " + cce.getMessage());
        }
    }
    
    /**
     * Adds a collection of <CODE>Chunk</CODE>s
     * to this <CODE>Phrase</CODE>.
     *
     * @param	collection	a collection of <CODE>Chunk</CODE>s, <CODE>Anchor</CODE>s and <CODE>Phrase</CODE>s.
     * @return	<CODE>true</CODE> if the action succeeded, <CODE>false</CODE> if not.
     * @throws	ClassCastException	when you try to add something that isn't a <CODE>Chunk</CODE>, <CODE>Anchor</CODE> or <CODE>Phrase</CODE>
     */
    public boolean addAll(Collection collection) {
        for (Iterator iterator = collection.iterator(); iterator.hasNext(); ) {
            this.add(iterator.next());
        }
        return true;
    }
    
    /**
     * Adds a Chunk.
     * <p>
     * This method is a hack to solve a problem I had with phrases that were split between chunks
     * in the wrong place.
     * @param chunk a Chunk to add to the Phrase
     * @return true if adding the Chunk succeeded
     */
    protected synchronized boolean addChunk(Chunk chunk) {
        if (!font.isStandardFont()) {
            chunk.setFont(font.difference(chunk.getFont()));
        }
        if (size() > 0 && !chunk.hasAttributes()) {
            try {
                Chunk previous = (Chunk) get(size() - 1);
                if (!previous.hasAttributes() && previous.getFont().compareTo(chunk.getFont()) == 0 && !"".equals(previous.getContent().trim()) && !"".equals(chunk.getContent().trim())) {
                    previous.append(chunk.getContent());
                    return true;
                }
            }
            catch(ClassCastException cce) {
            }
        }
        return super.add(chunk);
    }
    
    /**
     * Adds a <CODE>Object</CODE> to the <CODE>Paragraph</CODE>.
     *
     * @param	object		the object to add.
     */
    protected void addSpecial(Object object) {
        super.add(object);
    }
    
    // other methods that change the member variables
    
    /**
     * Sets the leading of this phrase.
     *
     * @param	leading		the new leading
     */
    
    public void setLeading(float leading) {
        this.leading = leading;
    }
    
    /**
     * Sets the main font of this phrase.
     * @param font	the new font
     */
    public void setFont(Font font) {
    	this.font = font;
    }
    
    // methods to retrieve information

	/**
     * Gets the leading of this phrase.
     *
     * @return	the linespacing
     */
    public float getLeading() {
        if (Float.isNaN(leading)) {
            return font.getCalculatedLeading(1.5f);
        }
        return leading;
    }

    /**
     * Checks you if the leading of this phrase is defined.
     *
     * @return	true if the leading is defined
     */ 
    public boolean hasLeading() {
        if (Float.isNaN(leading)) {
            return false;
        }
        return true;
    }

	/**
     * Gets the font of the first <CODE>Chunk</CODE> that appears in this <CODE>Phrase</CODE>.
     *
     * @return	a <CODE>Font</CODE>
     */  
    public Font getFont() {
        return font;
    }

	/**
     * Returns the content as a String object.
     * This method differs from toString because toString will return an ArrayList with the toString value of the Chunks in this Phrase.
     */
    public String getContent() {
    	StringBuffer buf = new StringBuffer();
    	for (Iterator i = getChunks().iterator(); i.hasNext(); ) {
    		buf.append(i.next().toString());
    	}
    	return buf.toString();
    }
    
    /**
     * Checks is this <CODE>Phrase</CODE> contains no or 1 empty <CODE>Chunk</CODE>.
     *
     * @return	<CODE>false</CODE> if the <CODE>Phrase</CODE>
     * contains more than one or more non-empty<CODE>Chunk</CODE>s.
     */
    public boolean isEmpty() {
        switch(size()) {
            case 0:
                return true;
            case 1:
                Element element = (Element) get(0);
                if (element.type() == Element.CHUNK && ((Chunk) element).isEmpty()) {
                    return true;
                }
                return false;
                default:
                    return false;
        }
    }
    
    // kept for historical reasons; people should use FontSelector
    // eligible for deprecation, but the methods are mentioned in the book p277.
    
    /**
     * Constructs a Phrase that can be used in the static getInstance() method.
     * @param	dummy	a dummy parameter
     */
    private Phrase(boolean dummy) {
    }
    
    /**
     * Gets a special kind of Phrase that changes some characters into corresponding symbols.
     * @param string
     * @return a newly constructed Phrase
     */
    public static final Phrase getInstance(String string) {
    	return getInstance(16, string, new Font());
    }
    
    /**
     * Gets a special kind of Phrase that changes some characters into corresponding symbols.
     * @param leading
     * @param string
     * @return a newly constructed Phrase
     */
    public static final Phrase getInstance(int leading, String string) {
    	return getInstance(leading, string, new Font());
    }
    
    /**
     * Gets a special kind of Phrase that changes some characters into corresponding symbols.
     * @param leading
     * @param string
     * @param font
     * @return a newly constructed Phrase
     */
    public static final Phrase getInstance(int leading, String string, Font font) {
    	Phrase p = new Phrase(true);
    	p.setLeading(leading);
    	p.font = font;
    	if (font.getFamily() != Font.SYMBOL && font.getFamily() != Font.ZAPFDINGBATS && font.getBaseFont() == null) {
            int index;
            while((index = SpecialSymbol.index(string)) > -1) {
                if (index > 0) {
                    String firstPart = string.substring(0, index);
                    ((ArrayList)p).add(new Chunk(firstPart, font));
                    string = string.substring(index);
                }
                Font symbol = new Font(Font.SYMBOL, font.getSize(), font.getStyle(), font.getColor());
                StringBuffer buf = new StringBuffer();
                buf.append(SpecialSymbol.getCorrespondingSymbol(string.charAt(0)));
                string = string.substring(1);
                while (SpecialSymbol.index(string) == 0) {
                    buf.append(SpecialSymbol.getCorrespondingSymbol(string.charAt(0)));
                    string = string.substring(1);
                }
                ((ArrayList)p).add(new Chunk(buf.toString(), symbol));
            }
        }
        if (string != null && string.length() != 0) {
        	((ArrayList)p).add(new Chunk(string, font));
        }
    	return p;
    }
    
    // deprecated constructor and methods
    
    /**
     * Returns a <CODE>Phrase</CODE> that has been constructed taking in account
     * the value of some <VAR>attributes</VAR>.
     *
     * @param	attributes		Some attributes
     */
    public Phrase(Properties attributes) {
        this(com.lowagie.text.factories.ElementFactory.getPhrase(attributes));
    }
    /**
     * Gets the font of the first <CODE>Chunk</CODE> that appears in this <CODE>Phrase</CODE>.
     *
     * @return	a <CODE>Font</CODE>
     * @deprecated Use {@link #getFont()} instead
     */  
    public Font font() {
    	return getFont();
    }    
    /**
     * Gets the leading of this phrase.
     *
     * @return	the linespacing
     * @deprecated Use {@link #getLeading()} instead
     */
    public float leading() {
    	return getLeading();
    }
    /**
     * Checks you if the leading of this phrase is defined.
     *
     * @return	true if the leading is defined
     * @deprecated Use {@link #hasLeading()} instead
     */
    public boolean leadingDefined() {
    	return hasLeading();
    }
    
    /**
	 * Returns the content as a String object.
	 * This method differs from toString because toString will return an ArrayList with the toString value of the Chunks in this Phrase.
	 * @deprecated Use {@link #getContent()} instead
	 */
	public String content() {
		return getContent();
	}
}