phrase.java

一个java操作pdf文件的开发包,很好用的.

    
/**
 * Gets all the chunks in this element.
 *
 * @return	an <CODE>ArrayList</CODE>
 */
    
    public ArrayList getChunks() {
        ArrayList tmp = new ArrayList();
        for (Iterator i = iterator(); i.hasNext(); ) {
            tmp.addAll(((Element) i.next()).getChunks());
        }
        return tmp;
    }
    
    // overriding some of the ArrayList-methods
    
/**
 * Adds a <CODE>Chunk</CODE>, an <CODE>Anchor</CODE> or another <CODE>Phrase</CODE>
 * to this <CODE>Phrase</CODE>.
 *
 * @param	index	index at which the specified element is to be inserted
 * @param	o   	an object of type <CODE>Chunk</CODE>, <CODE>Anchor</CODE> or <CODE>Phrase</CODE>
 * @throws	ClassCastException	when you try to add something that isn't a <CODE>Chunk</CODE>, <CODE>Anchor</CODE> or <CODE>Phrase</CODE>
 */
    
    public void add(int index, Object o) {
        try {
            Element element = (Element) o;
            if (element.type() == Element.CHUNK) {
                Chunk chunk = (Chunk) element;
                if (!font.isStandardFont()) {
                    chunk.setFont(font.difference(chunk.font()));
                }
                super.add(index, chunk);
            }
            else if (element.type() == Element.PHRASE ||
            element.type() == Element.ANCHOR ||
            element.type() == Element.ANNOTATION ||
            element.type() == Element.TABLE || // line added by David Freels
            element.type() == Element.GRAPHIC) {
                super.add(index, element);
            }
            else {
                throw new ClassCastException(String.valueOf(element.type()));
            }
        }
        catch(ClassCastException cce) {
            throw new ClassCastException("Insertion of illegal Element: " + cce.getMessage());
        }
    }
    
/**
 * Adds a <CODE>Chunk</CODE>, <CODE>Anchor</CODE> or another <CODE>Phrase</CODE>
 * to this <CODE>Phrase</CODE>.
 *
 * @param	o	an object of type <CODE>Chunk</CODE>, <CODE>Anchor</CODE> or <CODE>Phrase</CODE>
 * @return	a boolean
 * @throws	ClassCastException	when you try to add something that isn't a <CODE>Chunk</CODE>, <CODE>Anchor</CODE> or <CODE>Phrase</CODE>
 */
    
    public boolean add(Object o) {
        if (o instanceof String) {
            return super.add(new Chunk((String) o, font));
        }
        try {
            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.ANCHOR:
                    return super.add((Anchor) o);
                case Element.ANNOTATION:
                    return super.add((Annotation) o);
                case Element.TABLE: // case added by David Freels
                    return super.add((Table) o);
                case Element.LIST:
                    return super.add((List) o);
                    default:
                        throw new ClassCastException(String.valueOf(element.type()));
            }
        }
        catch(ClassCastException cce) {
            throw new ClassCastException("Insertion of illegal Element: " + cce.getMessage());
        }
    }
    
/**
 * 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.
 */
    
    private synchronized boolean addChunk(Chunk chunk) {
        if (!font.isStandardFont()) {
            chunk.setFont(font.difference(chunk.font()));
        }
        if (size() > 0 && !chunk.hasAttributes()) {
            try {
                Chunk previous = (Chunk) get(size() - 1);
                if (!previous.hasAttributes() && previous.font().compareTo(chunk.font()) == 0 && !"".equals(previous.content().trim()) && !"".equals(chunk.content().trim())) {
                    previous.append(chunk.content());
                    return true;
                }
            }
            catch(ClassCastException cce) {
            }
        }
        return super.add(chunk);
    }
    
/**
 * 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 <CODE>Object</CODE> to the <CODE>Paragraph</CODE>.
 *
 * @param	object		the object to add.
 */
    
    protected void addSpecial(Object object) {
        super.add(object);
    }
    
    // methods
    
/**
 * Sets the leading of this phrase.
 *
 * @param	leading		the new leading
 */
    
    public void setLeading(float leading) {
        this.leading = leading;
    }
    
    // methods to retrieve information
    
/**
 * 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;
        }
    }
    
/**
 * Checks you if the leading of this phrase is defined.
 *
 * @return	true if the leading is defined
 */
    
    public boolean leadingDefined() {
        if (Float.isNaN(leading)) {
            return false;
        }
        return true;
    }
    
/**
 * Gets the leading of this phrase.
 *
 * @return	the linespacing
 */
    
    public float leading() {
        if (Float.isNaN(leading)) {
            return font.leading(1.5f);
        }
        return leading;
    }
    
/**
 * Gets the font of the first <CODE>Chunk</CODE> that appears in this <CODE>Phrase</CODE>.
 *
 * @return	a <CODE>Font</CODE>
 */
    
    public Font font() {
        return font;
    }
    
/**
 * Checks if a given tag corresponds with this object.
 *
 * @param   tag     the given tag
 * @return  true if the tag corresponds
 */
    
    public static boolean isTag(String tag) {
        return ElementTags.PHRASE.equals(tag);
    }
    
    
/**
 * @see com.lowagie.text.MarkupAttributes#setMarkupAttribute(java.lang.String, java.lang.String)
 */
    public void setMarkupAttribute(String name, String value) {
        markupAttributes = (markupAttributes == null) ? new Properties() : markupAttributes;
        markupAttributes.put(name, value);
    }
    
/**
 * @see com.lowagie.text.MarkupAttributes#setMarkupAttributes(java.util.Properties)
 */
    public void setMarkupAttributes(Properties markupAttributes) {
        this.markupAttributes = markupAttributes;
    }
    
/**
 * @see com.lowagie.text.MarkupAttributes#getMarkupAttribute(java.lang.String)
 */
    public String getMarkupAttribute(String name) {
        return (markupAttributes == null) ? null : String.valueOf(markupAttributes.get(name));
    }
    
/**
 * @see com.lowagie.text.MarkupAttributes#getMarkupAttributeNames()
 */
    public Set getMarkupAttributeNames() {
        return Chunk.getKeySet(markupAttributes);
    }
    
/**
 * @see com.lowagie.text.MarkupAttributes#getMarkupAttributes()
 */
    public Properties getMarkupAttributes() {
        return markupAttributes;
    }
}