/* * 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; /** * Makes up the execution context, holding the available operators and the execution stack. * * @version $Revision$ */ public class ExecutionContext { private Operators operators; private Stack<Object> stack = new Stack<Object>(); /** * Creates a new execution context. * @param operatorSet the operator set */ public ExecutionContext(Operators operatorSet) { this.operators = operatorSet; } /** * Returns the stack used by this execution context. * @return the stack */ public Stack<Object> getStack() { return this.stack; } /** * Returns the operator set used by this execution context. * @return the operator set */ public Operators getOperators() { return this.operators; } /** * Pops a number (int or real) from the stack. If it's neither data type, a * ClassCastException is thrown. * @return the number */ public Number popNumber() { return (Number)stack.pop(); } /** * Pops a value of type int from the stack. If the value is not of type int, a * ClassCastException is thrown. * @return the int value */ public int popInt() { return ((Integer)stack.pop()).intValue(); } /** * Pops a number from the stack and returns it as a real value. If the value is not of a * numeric type, a ClassCastException is thrown. * @return the real value */ public float popReal() { return ((Number)stack.pop()).floatValue(); } }