| /* |
| * 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.tools.ant.taskdefs; |
| |
| import java.io.File; |
| import org.apache.tools.ant.AntClassLoader; |
| import org.apache.tools.ant.BuildException; |
| import org.apache.tools.ant.Project; |
| import org.apache.tools.ant.PropertyHelper; |
| import org.apache.tools.ant.Task; |
| import org.apache.tools.ant.taskdefs.condition.Condition; |
| import org.apache.tools.ant.types.EnumeratedAttribute; |
| import org.apache.tools.ant.types.Path; |
| import org.apache.tools.ant.types.Reference; |
| import org.apache.tools.ant.util.FileUtils; |
| import org.apache.tools.ant.util.StringUtils; |
| |
| /** |
| * Will set the given property if the requested resource is available at |
| * runtime. This task may also be used as a condition by the condition task. |
| * |
| * @since Ant 1.1 |
| * |
| * @ant.task category="control" |
| */ |
| public class Available extends Task implements Condition { |
| private static final FileUtils FILE_UTILS = FileUtils.getFileUtils(); |
| |
| private String property; |
| private String classname; |
| private String filename; |
| private File file; |
| private Path filepath; |
| private String resource; |
| private FileDir type; |
| private Path classpath; |
| private AntClassLoader loader; |
| private Object value = "true"; |
| private boolean isTask = false; |
| private boolean ignoreSystemclasses = false; |
| private boolean searchParents = false; |
| |
| /** |
| * Set the searchParents attribute. |
| * This controls the behaviour of the the "file" type. |
| * If true, the path, parent path and grandparent path are |
| * searched for the file. If false, only the path is seached. |
| * The default value is false. |
| * @param searchParents the value to set. |
| */ |
| public void setSearchParents(boolean searchParents) { |
| this.searchParents = searchParents; |
| } |
| |
| /** |
| * Set the classpath to be used when searching for classes and resources. |
| * |
| * @param classpath an Ant Path object containing the search path. |
| */ |
| public void setClasspath(Path classpath) { |
| createClasspath().append(classpath); |
| } |
| |
| /** |
| * Classpath to be used when searching for classes and resources. |
| * |
| * @return an empty Path instance to be configured by Ant. |
| */ |
| public Path createClasspath() { |
| if (this.classpath == null) { |
| this.classpath = new Path(getProject()); |
| } |
| return this.classpath.createPath(); |
| } |
| |
| /** |
| * Set the classpath by reference. |
| * |
| * @param r a Reference to a Path instance to be used as the classpath |
| * value. |
| */ |
| public void setClasspathRef(Reference r) { |
| createClasspath().setRefid(r); |
| } |
| |
| /** |
| * Set the path to use when looking for a file. |
| * |
| * @param filepath a Path instance containing the search path for files. |
| */ |
| public void setFilepath(Path filepath) { |
| createFilepath().append(filepath); |
| } |
| |
| /** |
| * Path to search for file resources. |
| * |
| * @return a new Path instance which Ant will configure with a file search |
| * path. |
| */ |
| public Path createFilepath() { |
| if (this.filepath == null) { |
| this.filepath = new Path(getProject()); |
| } |
| return this.filepath.createPath(); |
| } |
| |
| /** |
| * Set the name of the property which will be set if the particular resource |
| * is available. |
| * |
| * @param property the name of the property to set. |
| */ |
| public void setProperty(String property) { |
| this.property = property; |
| } |
| |
| /** |
| * Set the value to be given to the property if the desired resource is |
| * available. |
| * |
| * @param value the value to be given. |
| */ |
| public void setValue(Object value) { |
| this.value = value; |
| } |
| |
| /** |
| * Set the value to be given to the property if the desired resource is |
| * available. |
| * |
| * @param value the value to be given. |
| */ |
| public void setValue(String value) { |
| setValue((Object) value); |
| } |
| |
| /** |
| * Set a classname of a class which must be available to set the given |
| * property. |
| * |
| * @param classname the name of the class required. |
| */ |
| public void setClassname(String classname) { |
| if (!"".equals(classname)) { |
| this.classname = classname; |
| } |
| } |
| |
| /** |
| * Set the file which must be present in the file system to set the given |
| * property. |
| * |
| * @param file the name of the file which is required. |
| */ |
| public void setFile(File file) { |
| this.file = file; |
| this.filename = FILE_UTILS.removeLeadingPath(getProject().getBaseDir(), file); |
| } |
| |
| /** |
| * Set the name of a Java resource which is required to set the property. |
| * |
| * @param resource the name of a resource which is required to be available. |
| */ |
| public void setResource(String resource) { |
| this.resource = resource; |
| } |
| |
| /** |
| * @deprecated since 1.5.x. |
| * setType(String) is deprecated and is replaced with |
| * setType(Available.FileDir) to make Ant's Introspection |
| * mechanism do the work and also to encapsulate operations on |
| * the type in its own class. |
| * @param type the type of resource |
| */ |
| public void setType(String type) { |
| log("DEPRECATED - The setType(String) method has been deprecated." |
| + " Use setType(Available.FileDir) instead.", |
| Project.MSG_WARN); |
| this.type = new FileDir(); |
| this.type.setValue(type); |
| } |
| |
| /** |
| * Set what type of file is required - either directory or file. |
| * |
| * @param type an instance of the FileDir enumeratedAttribute indicating |
| * whether the file required is to be a directory or a plain |
| * file. |
| */ |
| public void setType(FileDir type) { |
| this.type = type; |
| } |
| |
| /** |
| * Set whether the search for classes should ignore the runtime classes and |
| * just use the given classpath. |
| * |
| * @param ignore true if system classes are to be ignored. |
| */ |
| public void setIgnoresystemclasses(boolean ignore) { |
| this.ignoreSystemclasses = ignore; |
| } |
| |
| /** |
| * Entry point when operating as a task. |
| * |
| * @exception BuildException if the task is not configured correctly. |
| */ |
| public void execute() throws BuildException { |
| if (property == null) { |
| throw new BuildException("property attribute is required", |
| getLocation()); |
| } |
| |
| isTask = true; |
| try { |
| if (eval()) { |
| PropertyHelper ph = PropertyHelper.getPropertyHelper(getProject()); |
| Object oldvalue = ph.getProperty(property); |
| if (null != oldvalue && !oldvalue.equals(value)) { |
| log("DEPRECATED - <available> used to override an existing" |
| + " property." |
| + StringUtils.LINE_SEP |
| + " Build file should not reuse the same property" |
| + " name for different values.", |
| Project.MSG_WARN); |
| } |
| // NB: this makes use of Project#setProperty rather than Project#setNewProperty |
| // due to backwards compatiblity reasons |
| ph.setProperty(property, value, true); |
| } |
| } finally { |
| isTask = false; |
| } |
| } |
| |
| /** |
| * Evaluate the availability of a resource. |
| * |
| * @return boolean is the resource is available. |
| * @exception BuildException if the condition is not configured correctly |
| */ |
| public boolean eval() throws BuildException { |
| try { |
| if (classname == null && file == null && resource == null) { |
| throw new BuildException("At least one of (classname|file|" |
| + "resource) is required", getLocation()); |
| } |
| if (type != null) { |
| if (file == null) { |
| throw new BuildException("The type attribute is only valid " |
| + "when specifying the file " |
| + "attribute.", getLocation()); |
| } |
| } |
| if (classpath != null) { |
| classpath.setProject(getProject()); |
| this.loader = getProject().createClassLoader(classpath); |
| } |
| String appendix = ""; |
| if (isTask) { |
| appendix = " to set property " + property; |
| } else { |
| setTaskName("available"); |
| } |
| if ((classname != null) && !checkClass(classname)) { |
| log("Unable to load class " + classname + appendix, |
| Project.MSG_VERBOSE); |
| return false; |
| } |
| if ((file != null) && !checkFile()) { |
| StringBuffer buf = new StringBuffer("Unable to find "); |
| if (type != null) { |
| buf.append(type).append(' '); |
| } |
| buf.append(filename).append(appendix); |
| log(buf.toString(), Project.MSG_VERBOSE); |
| return false; |
| } |
| if ((resource != null) && !checkResource(resource)) { |
| log("Unable to load resource " + resource + appendix, |
| Project.MSG_VERBOSE); |
| return false; |
| } |
| } finally { |
| if (loader != null) { |
| loader.cleanup(); |
| loader = null; |
| } |
| if (!isTask) { |
| setTaskName(null); |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Search for file/directory either relative to project's |
| * basedir or in the path given as filepath. |
| * |
| * <p>filepath can be a list of directory and/or file names (gen'd |
| * via <fileset>)</p> |
| * |
| * <p>look for:</p><ul> |
| * <li>full-pathname specified == path in list</li> |
| * <li>full-pathname specified == parent dir of path in list</li> |
| * <li>simple name specified == path in list</li> |
| * <li>simple name specified == path in list + name</li> |
| * <li>simple name specified == parent dir + name</li> |
| * <li>simple name specified == parent of parent dir + name</li> |
| * </ul> |
| */ |
| private boolean checkFile() { |
| if (filepath == null) { |
| return checkFile(file, filename); |
| } else { |
| String[] paths = filepath.list(); |
| for (int i = 0; i < paths.length; ++i) { |
| log("Searching " + paths[i], Project.MSG_VERBOSE); |
| File path = new File(paths[i]); |
| |
| // ** full-pathname specified == path in list |
| // ** simple name specified == path in list |
| if (path.exists() |
| && (filename.equals(paths[i]) |
| || filename.equals(path.getName()))) { |
| if (type == null) { |
| log("Found: " + path, Project.MSG_VERBOSE); |
| return true; |
| } else if (type.isDir() |
| && path.isDirectory()) { |
| log("Found directory: " + path, Project.MSG_VERBOSE); |
| return true; |
| } else if (type.isFile() |
| && path.isFile()) { |
| log("Found file: " + path, Project.MSG_VERBOSE); |
| return true; |
| } |
| // not the requested type |
| return false; |
| } |
| File parent = path.getParentFile(); |
| // ** full-pathname specified == parent dir of path in list |
| if (parent != null && parent.exists() |
| && filename.equals(parent.getAbsolutePath())) { |
| if (type == null) { |
| log("Found: " + parent, Project.MSG_VERBOSE); |
| return true; |
| } else if (type.isDir()) { |
| log("Found directory: " + parent, Project.MSG_VERBOSE); |
| return true; |
| } |
| // not the requested type |
| return false; |
| } |
| // ** simple name specified == path in list + name |
| if (path.exists() && path.isDirectory()) { |
| if (checkFile(new File(path, filename), |
| filename + " in " + path)) { |
| return true; |
| } |
| } |
| |
| // ** simple name specified == parent dir + name |
| while (searchParents && parent != null && parent.exists()) { |
| if (checkFile(new File(parent, filename), |
| filename + " in " + parent)) { |
| return true; |
| } |
| parent = parent.getParentFile(); |
| } |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Check if a given file exists and matches the required type. |
| */ |
| private boolean checkFile(File f, String text) { |
| if (type != null) { |
| if (type.isDir()) { |
| if (f.isDirectory()) { |
| log("Found directory: " + text, Project.MSG_VERBOSE); |
| } |
| return f.isDirectory(); |
| } else if (type.isFile()) { |
| if (f.isFile()) { |
| log("Found file: " + text, Project.MSG_VERBOSE); |
| } |
| return f.isFile(); |
| } |
| } |
| if (f.exists()) { |
| log("Found: " + text, Project.MSG_VERBOSE); |
| } |
| return f.exists(); |
| } |
| |
| /** |
| * Check if a given resource can be loaded. |
| */ |
| private boolean checkResource(String resource) { |
| if (loader != null) { |
| return (loader.getResourceAsStream(resource) != null); |
| } else { |
| ClassLoader cL = this.getClass().getClassLoader(); |
| if (cL != null) { |
| return (cL.getResourceAsStream(resource) != null); |
| } else { |
| return |
| (ClassLoader.getSystemResourceAsStream(resource) != null); |
| } |
| } |
| } |
| |
| /** |
| * Check if a given class can be loaded. |
| */ |
| private boolean checkClass(String classname) { |
| try { |
| if (ignoreSystemclasses) { |
| loader = getProject().createClassLoader(classpath); |
| loader.setParentFirst(false); |
| loader.addJavaLibraries(); |
| if (loader != null) { |
| try { |
| loader.findClass(classname); |
| } catch (SecurityException se) { |
| // class found but restricted name; this is |
| // actually the case we're looking for in JDK 1.3+, |
| // so catch the exception and return |
| return true; |
| } |
| } else { |
| return false; |
| } |
| } else if (loader != null) { |
| loader.loadClass(classname); |
| } else { |
| ClassLoader l = this.getClass().getClassLoader(); |
| // Can return null to represent the bootstrap class loader. |
| // see API docs of Class.getClassLoader. |
| if (l != null) { |
| Class.forName(classname, true, l); |
| } else { |
| Class.forName(classname); |
| } |
| } |
| return true; |
| } catch (ClassNotFoundException e) { |
| log("class \"" + classname + "\" was not found", |
| Project.MSG_DEBUG); |
| return false; |
| } catch (NoClassDefFoundError e) { |
| log("Could not load dependent class \"" + e.getMessage() |
| + "\" for class \"" + classname + "\"", |
| Project.MSG_DEBUG); |
| return false; |
| } |
| } |
| |
| /** |
| * EnumeratedAttribute covering the file types to be checked for, either |
| * file or dir. |
| */ |
| public static class FileDir extends EnumeratedAttribute { |
| |
| private static final String[] VALUES = {"file", "dir"}; |
| |
| /** |
| * @see EnumeratedAttribute#getValues |
| */ |
| /** {@inheritDoc}. */ |
| public String[] getValues() { |
| return VALUES; |
| } |
| |
| /** |
| * Indicate if the value specifies a directory. |
| * |
| * @return true if the value specifies a directory. |
| */ |
| public boolean isDir() { |
| return "dir".equalsIgnoreCase(getValue()); |
| } |
| |
| /** |
| * Indicate if the value specifies a file. |
| * |
| * @return true if the value specifies a file. |
| */ |
| public boolean isFile() { |
| return "file".equalsIgnoreCase(getValue()); |
| } |
| |
| } |
| } |