diff options
Diffstat (limited to '')
-rw-r--r-- | maven-plugins/tags/maven-zip-plugin-alpha1/src/main/java/org/apache/tuscany/maven/zip/PropertyUtils.java | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/maven-plugins/tags/maven-zip-plugin-alpha1/src/main/java/org/apache/tuscany/maven/zip/PropertyUtils.java b/maven-plugins/tags/maven-zip-plugin-alpha1/src/main/java/org/apache/tuscany/maven/zip/PropertyUtils.java new file mode 100644 index 0000000000..8c204987f1 --- /dev/null +++ b/maven-plugins/tags/maven-zip-plugin-alpha1/src/main/java/org/apache/tuscany/maven/zip/PropertyUtils.java @@ -0,0 +1,150 @@ +package org.apache.tuscany.maven.zip; + +/* + * 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. + */ + +import org.codehaus.plexus.util.IOUtil; + +import java.io.File; +import java.io.FileInputStream; +import java.io.FileNotFoundException; +import java.io.IOException; +import java.util.Enumeration; +import java.util.Properties; + +/** + * @author <a href="mailto:kenney@neonics.com">Kenney Westerhof</a> + * @version $Id: PropertyUtils.java 480784 2006-11-30 00:07:45Z jvanzyl $ + * @todo this is duplicated from the resources plugin - migrate to plexus-utils + */ +public final class PropertyUtils +{ + private PropertyUtils() + { + // prevent instantiation + } + + /** + * Reads a property file, resolving all internal variables. + * + * @param propfile The property file to load + * @param fail wheter to throw an exception when the file cannot be loaded or to return null + * @param useSystemProps wheter to incorporate System.getProperties settings into the returned Properties object. + * @return the loaded and fully resolved Properties object + */ + public static Properties loadPropertyFile( File propfile, boolean fail, boolean useSystemProps ) + throws IOException + { + Properties props = new Properties(); + + if ( useSystemProps ) + { + props = new Properties( System.getProperties() ); + } + + if ( propfile.exists() ) + { + FileInputStream inStream = new FileInputStream( propfile ); + try + { + props.load( inStream ); + } + finally + { + IOUtil.close( inStream ); + } + } + else if ( fail ) + { + throw new FileNotFoundException( propfile.toString() ); + } + + for ( Enumeration n = props.propertyNames(); n.hasMoreElements(); ) + { + String k = (String) n.nextElement(); + props.setProperty( k, PropertyUtils.getPropertyValue( k, props ) ); + } + + return props; + } + + + /** + * Retrieves a property value, replacing values like ${token} + * using the Properties to look them up. + * <p/> + * It will leave unresolved properties alone, trying for System + * properties, and implements reparsing (in the case that + * the value of a property contains a key), and will + * not loop endlessly on a pair like + * test = ${test}. + */ + private static String getPropertyValue( String k, Properties p ) + { + // This can also be done using InterpolationFilterReader, + // but it requires reparsing the file over and over until + // it doesn't change. + + String v = p.getProperty( k ); + String ret = ""; + int idx, idx2; + + while ( ( idx = v.indexOf( "${" ) ) >= 0 ) + { + // append prefix to result + ret += v.substring( 0, idx ); + + // strip prefix from original + v = v.substring( idx + 2 ); + + // if no matching } then bail + if ( ( idx2 = v.indexOf( '}' ) ) < 0 ) + { + break; + } + + // strip out the key and resolve it + // resolve the key/value for the ${statement} + String nk = v.substring( 0, idx2 ); + v = v.substring( idx2 + 1 ); + String nv = p.getProperty( nk ); + + // try global environment.. + if ( nv == null ) + { + nv = System.getProperty( nk ); + } + + // if the key cannot be resolved, + // leave it alone ( and don't parse again ) + // else prefix the original string with the + // resolved property ( so it can be parsed further ) + // taking recursion into account. + if ( nv == null || nv.equals( k ) ) + { + ret += "${" + nk + "}"; + } + else + { + v = nv + v; + } + } + return ret + v; + } +} |