/*
 * Copyright 1999-2004 The Apache Software Foundation.
 * 
 * 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.
 */

/* $Id$ */
 
package org.apache.fop.pdf;

// Java
import java.io.IOException;
import java.io.OutputStream;

// FOP
import org.apache.fop.fonts.type1.PFBData;

/**
 * Special PDFStream for embedding Type 1 fonts.
 */
public class PDFT1Stream extends AbstractPDFStream {
    
    private PFBData pfb;

    /**
     * @see org.apache.fop.pdf.AbstractPDFStream#getSizeHint()
     */
    protected int getSizeHint() throws IOException {
        if (this.pfb != null) {
            return pfb.getLength();
        } else {
            return 0; //no hint available
        }
    }

    /**
     * Overload the base object method so we don't have to copy
     * byte arrays around so much
     * @see org.apache.fop.pdf.PDFObject#output(OutputStream)
     */
    protected int output(java.io.OutputStream stream)
            throws java.io.IOException {
        if (pfb == null) {
            throw new IllegalStateException("pfb must not be null at this point");
        }
        log.debug("Writing " + pfb.getLength() + " bytes of Type 1 font data");

        int length = super.output(stream);
        log.debug("Embedded Type1 font");
        return length;
    }

    /**
     * @see org.apache.fop.pdf.AbstractPDFStream#buildStreamDict(String)
     */
    protected String buildStreamDict(String lengthEntry) {
        final String filterEntry = getFilterList().buildFilterDictEntries();
        return (getObjectID() 
                + "<< /Length " + lengthEntry 
                + " /Length1 " + pfb.getLength1()
                + " /Length2 " + pfb.getLength2()
                + " /Length3 " + pfb.getLength3() 
                + "\n" + filterEntry  
                + "\n>>\n");
    }

    /**
     * @see org.apache.fop.pdf.PDFStream#outputRawStreamData(OutputStream)
     */
    protected void outputRawStreamData(OutputStream out) throws IOException {
        this.pfb.outputAllParts(out);
    }
    
    /**
     * Used to set the PFBData object that represents the embeddable Type 1 
     * font.
     * @param pfb The PFB file
     * @throws IOException in case of an I/O problem
     */
    public void setData(PFBData pfb) throws IOException {
        this.pfb = pfb;
    }

}