Example usage for java.awt.image.renderable ParameterBlock getSources

Introduction

In this page you can find the example usage for java.awt.image.renderable ParameterBlock getSources.

Prototype

public Vector<Object> getSources() 

Source Link

Document

Returns the entire Vector of sources.

Usage

From source file:org.mrgeo.mapalgebra.RenderedImageMapOp.java

private RenderedOp _createRenderedOp() throws IOException {
    if (_factory == null) {
        throw new IllegalArgumentException("The RenderedImageFactory must be specified.");
    }/*  w ww . java  2  s.co  m*/

    // Reuse the parameters that the caller has already set up. But at
    // the end of the parameter list, we need to include the NoData value
    // for each source followed by the NoData value for this map op's
    // output (which for now will be the same as the NoData value for
    // the first input).
    // TODO: We assume the use of band 0 at this point, but that will change...
    ParameterBlock jaiParams = (ParameterBlock) _param.clone();
    if (jaiParams.getSources().size() == 0) {
        for (MapOp op : _inputs) {
            jaiParams.addSource(((RasterMapOp) op).getRasterOutput());
        }
    }
    if (includeFunctionNameInParameters()) {
        jaiParams.add(getFunctionName());
    }
    // The ConstantOpImage requires a tilesize in its constructor, but
    // the MapAlgebraParser does not have enough information at the time
    // this map was constructed (to set the tilesize), so we pass the tilesize
    // on the fly here when creating the ConstantOpImage.
    if (_factory instanceof ConstantDescriptor) {
        int tilesize = MapAlgebraExecutioner.calculateTileSize(findRoot());
        if (tilesize <= 0) {
            tilesize = Integer.parseInt(MrGeoProperties.getInstance().getProperty("tilesize", "512"));
        }
        jaiParams.add(tilesize);
    }

    // Need to add dependencies for OpImage descriptors so that required JARs
    // are pushed to the data node side during a map/reduce. Otherwise,
    // a NullPointerException will be thrown when the OpChainDriver attempts
    // to instantiate the operation chain on the mapper side.
    DependencyLoader.addDependencies(getConf(), _factory.getClass());
    return JAI.create(_factory.getClass().getName(), jaiParams, _hints);
}

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