com.craigburke.document.builder.PdfDocumentBuilder.groovy Maven / Gradle / Ivy

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package com.craigburke.document.builder

import com.craigburke.document.builder.render.ParagraphRenderer
import com.craigburke.document.builder.render.TableRenderer
import com.craigburke.document.core.EmbeddedFont
import groovy.transform.InheritConstructors
import groovy.xml.MarkupBuilder

import com.craigburke.document.core.builder.DocumentBuilder
import com.craigburke.document.core.Document
import com.craigburke.document.core.Paragraph
import com.craigburke.document.core.Table
import com.craigburke.document.core.Image

import org.apache.pdfbox.pdmodel.PDDocument
import org.apache.pdfbox.pdmodel.common.PDMetadata

/**
 * Builder for PDF documents
 * @author Craig Burke
 */
@InheritConstructors
class PdfDocumentBuilder extends DocumentBuilder {

	void initializeDocument(Document document, OutputStream out) {
        PdfDocument pdfDocument = new PdfDocument(document)
        document.item = pdfDocument

        pdfDocument.x = document.margin.left
        pdfDocument.y = document.margin.top

        document.item = pdfDocument
        document
    }

    @Override
    void addFont(EmbeddedFont embeddedFont) {
        super.addFont(embeddedFont)
        PdfFont.addFont(document.item.pdDocument, embeddedFont)
    }

	def addParagraphToDocument = { Paragraph paragraph, Document document ->
		document.item.x = paragraph.margin.left + document.margin.left
        document.item.moveDownPage(paragraph.margin.top)
	}

	def onParagraphComplete = { Paragraph paragraph ->
        int pageWidth = document.item.currentPage.mediaBox.width - document.margin.left - document.margin.right
        int maxLineWidth = pageWidth - paragraph.margin.left - paragraph.margin.right
        int renderStartX = document.margin.left + paragraph.margin.left

        ParagraphRenderer paragraphRenderer = new ParagraphRenderer(paragraph, document, renderStartX, maxLineWidth)
        paragraphRenderer.render()

        document.item.moveDownPage(paragraph.margin.bottom)
    }

	def addTableToDocument = { Table table, Document document ->
        document.item.x = table.margin.left + document.margin.left
        document.item.moveDownPage(table.margin.top)
	}

    def onTableComplete = { Table table ->
        TableRenderer tableRenderer = new TableRenderer(table, document)
        tableRenderer.render()
        document.item.moveDownPage(table.margin.bottom)
    }

	void writeDocument(Document document, OutputStream out) {
		addMetadata()
		document.item.contentStream?.close()
		document.item.pdDocument.save(out)
		document.item.pdDocument.close()
	}

	private void addMetadata() {
		ByteArrayOutputStream xmpOut = new ByteArrayOutputStream()
		def xml = new MarkupBuilder(xmpOut.newWriter())

		xml.document(marginTop:"${document.margin.top}", marginBottom:"${document.margin.bottom}",
                marginLeft:"${document.margin.left}", marginRight:"${document.margin.right}") {

			delegate = xml
			resolveStrategy = Closure.DELEGATE_FIRST

			document.children.each { child ->
				if (child.getClass() == Paragraph) {
                    addParagraphToMetadata(delegate, child)
				}
				else {
                    addTableToMetadata(delegate, child)
                }
			}
		}

		def catalog = document.item.pdDocument.documentCatalog
        InputStream inputStream = new ByteArrayInputStream(xmpOut.toByteArray())

		PDMetadata metadata = new PDMetadata(document.item.pdDocument as PDDocument, inputStream, false)
		catalog.metadata = metadata
	}

    private void addParagraphToMetadata(builder, Paragraph paragraphNode) {
        builder.paragraph(marginTop:"${paragraphNode.margin.top}",
                marginBottom:"${paragraphNode.margin.bottom}",
                marginLeft:"${paragraphNode.margin.left}",
                marginRight:"${paragraphNode.margin.right}") {
                    paragraphNode.children.findAll { it.getClass() == Image }.each {
                        image()
                    }
                }
    }

    private void addTableToMetadata(builder, Table tableNode) {

        builder.table(columns:tableNode.columns, width:tableNode.width, borderSize:tableNode.border.size) {

            delegate = builder
            resolveStrategy = Closure.DELEGATE_FIRST

            tableNode.children.each {
                def cells = it.children
                row {
                    cells.each {
                        cell(width:"${it.width ?: 0}")
                    }
                }
            }
        }
    }

}