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Diffstat (limited to 'src/main/java/com/beust/jcommander/defaultprovider/PropertyFileDefaultProvider.java')
-rw-r--r-- | src/main/java/com/beust/jcommander/defaultprovider/PropertyFileDefaultProvider.java | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/main/java/com/beust/jcommander/defaultprovider/PropertyFileDefaultProvider.java b/src/main/java/com/beust/jcommander/defaultprovider/PropertyFileDefaultProvider.java new file mode 100644 index 0000000..d5401a1 --- /dev/null +++ b/src/main/java/com/beust/jcommander/defaultprovider/PropertyFileDefaultProvider.java @@ -0,0 +1,70 @@ +/** + * Copyright (C) 2010 the original author or authors. + * See the notice.md file distributed with this work for additional + * information regarding copyright ownership. + * + * Licensed 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 com.beust.jcommander.defaultprovider; + +import com.beust.jcommander.IDefaultProvider; +import com.beust.jcommander.ParameterException; + +import java.io.IOException; +import java.net.URL; +import java.util.Properties; + +/** + * A default provider that reads its default values from a property file. + * + * @author cbeust + */ +public class PropertyFileDefaultProvider implements IDefaultProvider { + public static final String DEFAULT_FILE_NAME = "jcommander.properties"; + private Properties m_properties; + + public PropertyFileDefaultProvider() { + init(DEFAULT_FILE_NAME); + } + + public PropertyFileDefaultProvider(String fileName) { + init(fileName); + } + + private void init(String fileName) { + try { + m_properties = new Properties(); + URL url = ClassLoader.getSystemResource(fileName); + if (url != null) { + m_properties.load(url.openStream()); + } else { + throw new ParameterException("Could not find property file: " + fileName + + " on the class path"); + } + } + catch (IOException e) { + throw new ParameterException("Could not open property file: " + fileName); + } + } + + public String getDefaultValueFor(String optionName) { + int index = 0; + while (index < optionName.length() && ! Character.isLetterOrDigit(optionName.charAt(index))) { + index++; + } + String key = optionName.substring(index); + return m_properties.getProperty(key); + } + +} |