ar.com.hjg.pngj.chunks.ChunkFactory Maven / Gradle / Ivy
package ar.com.hjg.pngj.chunks;
import ar.com.hjg.pngj.IChunkFactory;
import ar.com.hjg.pngj.ImageInfo;
/**
* Default chunk factory.
*
* The user that wants to parse custom chunks can extend
* {@link #createEmptyChunkExtended(String, ImageInfo)}
*/
public class ChunkFactory implements IChunkFactory {
boolean parse;
public ChunkFactory() {
this(true);
}
public ChunkFactory(boolean parse) {
this.parse = parse;
}
public final PngChunk createChunk(ChunkRaw chunkRaw, ImageInfo imgInfo) {
PngChunk c = createEmptyChunkKnown(chunkRaw.id, imgInfo);
if (c == null)
c = createEmptyChunkExtended(chunkRaw.id, imgInfo);
if (c == null)
c = createEmptyChunkUnknown(chunkRaw.id, imgInfo);
c.setRaw(chunkRaw);
if (parse && chunkRaw.data != null)
c.parseFromRaw(chunkRaw);
return c;
}
protected final PngChunk createEmptyChunkKnown(String id, ImageInfo imgInfo) {
if (id.equals(ChunkHelper.IDAT))
return new PngChunkIDAT(imgInfo);
if (id.equals(ChunkHelper.IHDR))
return new PngChunkIHDR(imgInfo);
if (id.equals(ChunkHelper.PLTE))
return new PngChunkPLTE(imgInfo);
if (id.equals(ChunkHelper.IEND))
return new PngChunkIEND(imgInfo);
if (id.equals(ChunkHelper.tEXt))
return new PngChunkTEXT(imgInfo);
if (id.equals(ChunkHelper.iTXt))
return new PngChunkITXT(imgInfo);
if (id.equals(ChunkHelper.zTXt))
return new PngChunkZTXT(imgInfo);
if (id.equals(ChunkHelper.bKGD))
return new PngChunkBKGD(imgInfo);
if (id.equals(ChunkHelper.gAMA))
return new PngChunkGAMA(imgInfo);
if (id.equals(ChunkHelper.pHYs))
return new PngChunkPHYS(imgInfo);
if (id.equals(ChunkHelper.iCCP))
return new PngChunkICCP(imgInfo);
if (id.equals(ChunkHelper.tIME))
return new PngChunkTIME(imgInfo);
if (id.equals(ChunkHelper.tRNS))
return new PngChunkTRNS(imgInfo);
if (id.equals(ChunkHelper.cHRM))
return new PngChunkCHRM(imgInfo);
if (id.equals(ChunkHelper.sBIT))
return new PngChunkSBIT(imgInfo);
if (id.equals(ChunkHelper.sRGB))
return new PngChunkSRGB(imgInfo);
if (id.equals(ChunkHelper.hIST))
return new PngChunkHIST(imgInfo);
if (id.equals(ChunkHelper.sPLT))
return new PngChunkSPLT(imgInfo);
return null;
}
/**
* This is used as last resort factory method.
*
* It creates a {@link PngChunkUNKNOWN} chunk.
*/
protected final PngChunk createEmptyChunkUnknown(String id, ImageInfo imgInfo) {
return new PngChunkUNKNOWN(id, imgInfo);
}
/**
* Factory for chunks that are not in the original PNG standard. This can be overriden (but dont
* forget to call this also)
*
* @param id Chunk id , 4 letters
* @param imgInfo Usually not needed
* @return null if chunk id not recognized
*/
protected PngChunk createEmptyChunkExtended(String id, ImageInfo imgInfo) {
if (id.equals(PngChunkOFFS.ID))
return new PngChunkOFFS(imgInfo);
if (id.equals(PngChunkSTER.ID))
return new PngChunkSTER(imgInfo);
return null; // extend!
}
}