Java tutorial
/* * 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.cos; import java.io.IOException; /** * This class represents an abstract number in a PDF document. * * @author Ben Litchfield */ public abstract class COSNumber extends COSBase { /** * This will get the float value of this number. * * @return The float value of this object. */ public abstract float floatValue(); /** * This will get the double value of this number. * * @return The double value of this number. */ public abstract double doubleValue(); /** * This will get the integer value of this number. * * @return The integer value of this number. */ public abstract int intValue(); /** * This will get the long value of this number. * * @return The long value of this number. */ public abstract long longValue(); /** * This factory method will get the appropriate number object. * * @param number The string representation of the number. * * @return A number object, either float or int. * * @throws IOException If the string is not a number. */ public static COSNumber get(String number) throws IOException { if (number.length() == 1) { char digit = number.charAt(0); if ('0' <= digit && digit <= '9') { return COSInteger.get(digit - '0'); } else if (digit == '-' || digit == '.') { // See https://issues.apache.org/jira/browse/PDFBOX-592 return COSInteger.ZERO; } else { throw new IOException("Not a number: " + number); } } else if (number.indexOf('.') == -1 && (number.toLowerCase().indexOf('e') == -1)) { try { if (number.charAt(0) == '+') { return COSInteger.get(Long.parseLong(number.substring(1))); } return COSInteger.get(Long.parseLong(number)); } catch (NumberFormatException e) { // might be a huge number, see PDFBOX-3116 return new COSFloat(number); } } else { return new COSFloat(number); } } }