corner.orm.tapestry.pdf.components.PageFragment.java Source code

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Here is the source code for corner.orm.tapestry.pdf.components.PageFragment.java

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// Copyright 2007 the original author or authors.
// site: http://www.bjmaxinfo.com
// file: $Id: PageFragment.java 3919 2008-01-16 04:36:52Z xf $
// created at:2007-07-31
//
// 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 corner.orm.tapestry.pdf.components;

import org.apache.hivemind.util.Defense;
import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.annotations.Parameter;

import com.lowagie.text.Document;

import corner.orm.tapestry.pdf.PdfOutputPageEvent;
import corner.orm.tapestry.pdf.PdfWriterDelegate;

/**
 * pdf.
 * 
 * @author <a href="mailto:jun.tsai@bjmaxinfo.com">Jun Tsai</a>
 * @author <a href=mailto:Ghostbb@bjmaxinfo.com>Ghostbb</a>
 * @version $Revision: 3919 $
 * @since 2.3.7
 */
public abstract class PageFragment extends AbstractPdfComponent {

    /**
     * ??.
     */
    public static final String CURRENT_PAGE_FRAGMENT_ATTRIBUTE_NAME = "pdf-current-page-frag";

    @Parameter(required = true)
    public abstract int getPageNum();

    /**
     * @see corner.orm.tapestry.pdf.components.AbstractPdfComponent#renderPdf(corner.orm.tapestry.pdf.PdfWriterDelegate, com.lowagie.text.Document)
     */
    public void renderPdf(PdfWriterDelegate writer, Document doc) {
        doc.newPage();
        PdfOutputPageEvent event = (PdfOutputPageEvent) writer.getPdfWriter().getPageEvent();
        event.addTemplateData(writer.getPdfWriter(), doc, getPageNum());
    }

    /**
     * @see corner.orm.tapestry.pdf.components.AbstractPdfComponent#renderComponent(org.apache.tapestry.IMarkupWriter, org.apache.tapestry.IRequestCycle)
     */
    protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) {
        Defense.isAssignable(writer, PdfWriterDelegate.class, "writer");
        super.renderComponent(writer, cycle);
        // ?
        Object oldObj = cycle.getAttribute(CURRENT_PAGE_FRAGMENT_ATTRIBUTE_NAME);
        cycle.setAttribute(CURRENT_PAGE_FRAGMENT_ATTRIBUTE_NAME, this);
        renderBody(writer, cycle);
        cycle.removeAttribute(CURRENT_PAGE_FRAGMENT_ATTRIBUTE_NAME);
        // ?.
        if (oldObj != null) {
            cycle.setAttribute(CURRENT_PAGE_FRAGMENT_ATTRIBUTE_NAME, oldObj);
        }

    }
}