| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
| ScreenLoader |
|
| 1.0;1 |
| 1 | package org.apache.turbine.modules; | |
| 2 | ||
| 3 | ||
| 4 | /* | |
| 5 | * Licensed to the Apache Software Foundation (ASF) under one | |
| 6 | * or more contributor license agreements. See the NOTICE file | |
| 7 | * distributed with this work for additional information | |
| 8 | * regarding copyright ownership. The ASF licenses this file | |
| 9 | * to you under the Apache License, Version 2.0 (the | |
| 10 | * "License"); you may not use this file except in compliance | |
| 11 | * with the License. You may obtain a copy of the License at | |
| 12 | * | |
| 13 | * http://www.apache.org/licenses/LICENSE-2.0 | |
| 14 | * | |
| 15 | * Unless required by applicable law or agreed to in writing, | |
| 16 | * software distributed under the License is distributed on an | |
| 17 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
| 18 | * KIND, either express or implied. See the License for the | |
| 19 | * specific language governing permissions and limitations | |
| 20 | * under the License. | |
| 21 | */ | |
| 22 | ||
| 23 | ||
| 24 | import org.apache.turbine.Turbine; | |
| 25 | import org.apache.turbine.pipeline.PipelineData; | |
| 26 | ||
| 27 | /** | |
| 28 | * The purpose of this class is to allow one to load and execute | |
| 29 | * Screen modules. | |
| 30 | * | |
| 31 | * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a> | |
| 32 | * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> | |
| 33 | * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a> | |
| 34 | * @version $Id: ScreenLoader.java 1709648 2015-10-20 17:08:10Z tv $ | |
| 35 | */ | |
| 36 | 27 | public class ScreenLoader |
| 37 | extends GenericLoader<Screen> | |
| 38 | implements Loader<Screen> | |
| 39 | { | |
| 40 | /** The single instance of this class. */ | |
| 41 | 31 | private static ScreenLoader instance = new ScreenLoader(); |
| 42 | ||
| 43 | /** | |
| 44 | * These ctor's are private to force clients to use getInstance() | |
| 45 | * to access this class. | |
| 46 | */ | |
| 47 | private ScreenLoader() | |
| 48 | { | |
| 49 | 31 | super(); |
| 50 | 31 | } |
| 51 | ||
| 52 | /** | |
| 53 | * Attempts to load and execute the external Screen. This is used | |
| 54 | * when you want to execute a Screen which returns its output via | |
| 55 | * a String instead of out the data.getResponse() value. | |
| 56 | * This allows you to easily chain the execution of Screen modules | |
| 57 | * together. | |
| 58 | * | |
| 59 | * @param pipelineData Turbine information. | |
| 60 | * @param name Name of object that will execute the screen. | |
| 61 | * @return the output of the screen module | |
| 62 | * @exception Exception a generic exception. | |
| 63 | */ | |
| 64 | public String eval(PipelineData pipelineData, String name) | |
| 65 | throws Exception | |
| 66 | { | |
| 67 | // Execute screen | |
| 68 | 4 | return getAssembler(name).build(pipelineData); |
| 69 | } | |
| 70 | ||
| 71 | /** | |
| 72 | * Attempts to load and execute the Screen. This is used when you | |
| 73 | * want to execute a Screen which returns its output via the | |
| 74 | * data.getResponse() object. | |
| 75 | * | |
| 76 | * @param pipelineData Turbine information. | |
| 77 | * @param name Name of object that will execute the screen. | |
| 78 | * @exception Exception a generic exception. | |
| 79 | */ | |
| 80 | @Override | |
| 81 | public void exec(PipelineData pipelineData, String name) | |
| 82 | throws Exception | |
| 83 | { | |
| 84 | 0 | this.eval(pipelineData, name); |
| 85 | 0 | } |
| 86 | ||
| 87 | /** | |
| 88 | * Pulls out an instance of the object by name. Name is just the | |
| 89 | * single name of the object. | |
| 90 | * | |
| 91 | * @param name Name of object instance. | |
| 92 | * @return A Screen with the specified name, or null. | |
| 93 | * @exception Exception a generic exception. | |
| 94 | */ | |
| 95 | @Override | |
| 96 | public Screen getAssembler(String name) | |
| 97 | throws Exception | |
| 98 | { | |
| 99 | 35 | return getAssembler(Screen.class, name); |
| 100 | } | |
| 101 | ||
| 102 | /** | |
| 103 | * @see org.apache.turbine.modules.Loader#getCacheSize() | |
| 104 | */ | |
| 105 | @Override | |
| 106 | public int getCacheSize() | |
| 107 | { | |
| 108 | 82 | return ScreenLoader.getConfiguredCacheSize(); |
| 109 | } | |
| 110 | ||
| 111 | /** | |
| 112 | * The method through which this class is accessed. | |
| 113 | * | |
| 114 | * @return The single instance of this class. | |
| 115 | */ | |
| 116 | public static ScreenLoader getInstance() | |
| 117 | { | |
| 118 | 90 | return instance; |
| 119 | } | |
| 120 | ||
| 121 | /** | |
| 122 | * Helper method to get the configured cache size for this module | |
| 123 | * | |
| 124 | * @return the configure cache size | |
| 125 | */ | |
| 126 | private static int getConfiguredCacheSize() | |
| 127 | { | |
| 128 | 82 | return Turbine.getConfiguration().getInt(Screen.CACHE_SIZE_KEY, |
| 129 | Screen.CACHE_SIZE_DEFAULT); | |
| 130 | } | |
| 131 | } |