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PDF renderer implementation supporting the subset of PDF 1.4 specification.

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package org.openpdf.renderer.function.postscript.operation;

import java.util.Stack;

final class IfElse implements PostScriptOperation {
	@Override
	/**
	 * bool {expr1} {expr2} ifelse - 
	 *
	 * removes all three operands from the stack, then
	 * executes proc1 if bool is true or proc2 if bool is false.
	 * The ifelse operator pushes no results of its own on the
	 * operand stack, but the procedure it executes may do so
	 * (see Section 3.5, "Execution"). 

	 *
	 * Examples 

	 * 4 3 lt {(TruePart)} {(FalsePart)} ifelse 

	 * results in FalsePart, since 4 is not less than 3 

	 *
	 * errors: stackunderflow, typecheck
	 */
    public void eval(Stack