1 package org.apache.maven.search.request; 2 3 /* 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 22 /** 23 * Paging. 24 */ 25 public final class Paging 26 { 27 private final int pageSize; 28 29 private final int pageOffset; 30 31 /** 32 * Creates paging instance with given page size (must be greater than 0) and page offset (must be non-negative). 33 */ 34 public Paging( int pageSize, int pageOffset ) 35 { 36 if ( pageSize < 1 ) 37 { 38 throw new IllegalArgumentException( "pageSize" ); 39 } 40 if ( pageOffset < 0 ) 41 { 42 throw new IllegalArgumentException( "pageOffset" ); 43 } 44 this.pageSize = pageSize; 45 this.pageOffset = pageOffset; 46 } 47 48 /** 49 * Creates paging instance with given page size (must be grater than 0) and 0 page offset. 50 */ 51 public Paging( int pageSize ) 52 { 53 this( pageSize, 0 ); 54 } 55 56 /** 57 * Returns the page size: positive integer, never zero or less. 58 */ 59 public int getPageSize() 60 { 61 return pageSize; 62 } 63 64 /** 65 * Returns the page offset: a zero or a positive integer. 66 */ 67 public int getPageOffset() 68 { 69 return pageOffset; 70 } 71 72 /** 73 * Creates "next page" instance relative to this instance. 74 */ 75 public Paging nextPage() 76 { 77 return new Paging( pageSize, pageOffset + 1 ); 78 } 79 80 @Override 81 public String toString() 82 { 83 return getClass().getSimpleName() + "{pageSize=" + pageSize + ", pageOffset=" + pageOffset + "}"; 84 } 85 }