/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.pdfbox.pdmodel.common.function.type4;
import java.util.Stack;
/**
* Provides the conditional operators such as "if" and "ifelse".
*
*/
class ConditionalOperators
{
/** Implements the "if" operator. */
static class If implements Operator
{
public void execute(ExecutionContext context)
{
Stack<Object> stack = context.getStack();
InstructionSequence proc = (InstructionSequence)stack.pop();
Boolean condition = (Boolean)stack.pop();
if (condition)
{
proc.execute(context);
}
}
}
/** Implements the "ifelse" operator. */
static class IfElse implements Operator
{
public void execute(ExecutionContext context)
{
Stack<Object> stack = context.getStack();
InstructionSequence proc2 = (InstructionSequence)stack.pop();
InstructionSequence proc1 = (InstructionSequence)stack.pop();
Boolean condition = (Boolean)stack.pop();
if (condition)
{
proc1.execute(context);
}
else
{
proc2.execute(context);
}
}
}
}