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/*
* Copyright 2000-2004 The Apache Software Foundation
*
* 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 org.apache.tools.ant.taskdefs;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Enumeration;
import java.util.Properties;
import java.util.Stack;
import java.util.Vector;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.ProjectHelper;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.types.Reference;
/**
* Sets a property by name, or set of properties (from file or
* resource) in the project.
* Properties are immutable: whoever sets a property first freezes it for the
* rest of the build; they are most definitely not variable.
* There are five ways to set properties:
*
* - By supplying both the name and value attribute.
* - By supplying both the name and refid attribute.
* - By setting the file attribute with the filename of the property
* file to load. This property file has the format as defined by the file used
* in the class java.util.Properties.
* - By setting the resource attribute with the resource name of the
* property file to load. This property file has the format as defined by the
* file used in the class java.util.Properties.
* - By setting the environment attribute with a prefix to use.
* Properties will be defined for every environment variable by
* prefixing the supplied name and a period to the name of the variable.
*
* Although combinations of these ways are possible, only one should be used
* at a time. Problems might occur with the order in which properties are set, for
* instance.
* The value part of the properties being set, might contain references to other
* properties. These references are resolved at the time these properties are set.
* This also holds for properties loaded from a property file.
* Properties are case sensitive.
*
* @since Ant 1.1
*
* @ant.attribute.group name="name" description="One of these, when using the name attribute"
* @ant.attribute.group name="noname" description="One of these, when not using the name attribute"
*/
public class Property extends Task {
protected String name;
protected String value;
protected File file;
protected URL url;
protected String resource;
protected Path classpath;
protected String env;
protected Reference ref;
protected String prefix;
private Project fallback;
protected boolean userProperty; // set read-only properties
public Property() {
this(false);
}
/**
* @since Ant 1.5
*/
protected Property(boolean userProperty) {
this(userProperty, null);
}
/**
* @since Ant 1.5
*/
protected Property(boolean userProperty, Project fallback) {
this.userProperty = userProperty;
this.fallback = fallback;
}
/**
* The name of the property to set.
* @param name property name
*/
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
/**
* Sets the property to the absolute filename of the
* given file. If the value of this attribute is an absolute path, it
* is left unchanged (with / and \ characters converted to the
* current platforms conventions). Otherwise it is taken as a path
* relative to the project's basedir and expanded.
* @param location path to set
*
* @ant.attribute group="name"
*/
public void setLocation(File location) {
setValue(location.getAbsolutePath());
}
/**
* The value of the property.
* @param value value to assign
*
* @ant.attribute group="name"
*/
public void setValue(String value) {
this.value = value;
}
public String getValue() {
return value;
}
/**
* Filename of a property file to load.
* @param file filename
*
* @ant.attribute group="noname"
*/
public void setFile(File file) {
this.file = file;
}
public File getFile() {
return file;
}
/**
* The url from which to load properties.
* @param url url string
*
* @ant.attribute group="noname"
*/
public void setUrl(URL url) {
this.url = url;
}
public URL getUrl() {
return url;
}
/**
* Prefix to apply to properties loaded using file
* or resource.
* A "." is appended to the prefix if not specified.
* @param prefix prefix string
* @since Ant 1.5
*/
public void setPrefix(String prefix) {
this.prefix = prefix;
if (!prefix.endsWith(".")) {
this.prefix += ".";
}
}
/**
* @since Ant 1.5
*/
public String getPrefix() {
return prefix;
}
/**
* Sets a reference to an Ant datatype
* declared elsewhere.
* Only yields reasonable results for references
* PATH like structures or properties.
* @param ref reference
*
* @ant.attribute group="name"
*/
public void setRefid(Reference ref) {
this.ref = ref;
}
public Reference getRefid() {
return ref;
}
/**
* The resource name of a property file to load
* @param resource resource on classpath
*
* @ant.attribute group="noname"
*/
public void setResource(String resource) {
this.resource = resource;
}
public String getResource() {
return resource;
}
/**
* Prefix to use when retrieving environment variables.
* Thus if you specify environment="myenv"
* you will be able to access OS-specific
* environment variables via property names "myenv.PATH" or
* "myenv.TERM".
*
* Note that if you supply a property name with a final
* "." it will not be doubled. ie environment="myenv." will still
* allow access of environment variables through "myenv.PATH" and
* "myenv.TERM". This functionality is currently only implemented
* on select platforms. Feel free to send patches to increase the number of platforms
* this functionality is supported on ;).
* Note also that properties are case sensitive, even if the
* environment variables on your operating system are not, e.g. it
* will be ${env.Path} not ${env.PATH} on Windows 2000.
* @param env prefix
*
* @ant.attribute group="noname"
*/
public void setEnvironment(String env) {
this.env = env;
}
/**
* @since Ant 1.5
*/
public String getEnvironment() {
return env;
}
/**
* The classpath to use when looking up a resource.
* @param classpath to add to any existing classpath
*/
public void setClasspath(Path classpath) {
if (this.classpath == null) {
this.classpath = classpath;
} else {
this.classpath.append(classpath);
}
}
/**
* The classpath to use when looking up a resource.
*/
public Path createClasspath() {
if (this.classpath == null) {
this.classpath = new Path(getProject());
}
return this.classpath.createPath();
}
/**
* the classpath to use when looking up a resource,
* given as reference to a <path> defined elsewhere
*/
public void setClasspathRef(Reference r) {
createClasspath().setRefid(r);
}
/**
* @since Ant 1.5
*/
public Path getClasspath() {
return classpath;
}
/**
* @deprecated This was never a supported feature and has been
* deprecated without replacement
* @ant.attribute ignore="true"
*/
public void setUserProperty(boolean userProperty) {
log("DEPRECATED: Ignoring request to set user property in Property"
+ " task.", Project.MSG_WARN);
}
/**
* get the value of this property
* @return the current value or the empty string
*/
public String toString() {
return value == null ? "" : value;
}
/**
* set the property in the project to the value.
* if the task was give a file, resource or env attribute
* here is where it is loaded
*/
public void execute() throws BuildException {
if (getProject() == null) {
throw new IllegalStateException("project has not been set");
}
if (name != null) {
if (value == null && ref == null) {
throw new BuildException("You must specify value, location or "
+ "refid with the name attribute",
getLocation());
}
} else {
if (url == null && file == null && resource == null && env == null) {
throw new BuildException("You must specify url, file, resource or "
+ "environment when not using the "
+ "name attribute", getLocation());
}
}
if (url == null && file == null && resource == null && prefix != null) {
throw new BuildException("Prefix is only valid when loading from "
+ "a url, file or resource", getLocation());
}
if ((name != null) && (value != null)) {
addProperty(name, value);
}
if (file != null) {
loadFile(file);
}
if (url != null) {
loadUrl(url);
}
if (resource != null) {
loadResource(resource);
}
if (env != null) {
loadEnvironment(env);
}
if ((name != null) && (ref != null)) {
try {
addProperty(name,
ref.getReferencedObject(getProject()).toString());
} catch (BuildException be) {
if (fallback != null) {
addProperty(name,
ref.getReferencedObject(fallback).toString());
} else {
throw be;
}
}
}
}
/**
* load properties from a url
* @param url url to load from
*/
protected void loadUrl(URL url) throws BuildException {
Properties props = new Properties();
log("Loading " + url, Project.MSG_VERBOSE);
try {
InputStream is = url.openStream();
try {
props.load(is);
} finally {
if (is != null) {
is.close();
}
}
addProperties(props);
} catch (IOException ex) {
throw new BuildException(ex, getLocation());
}
}
/**
* load properties from a file
* @param file file to load
*/
protected void loadFile(File file) throws BuildException {
Properties props = new Properties();
log("Loading " + file.getAbsolutePath(), Project.MSG_VERBOSE);
try {
if (file.exists()) {
FileInputStream fis = new FileInputStream(file);
try {
props.load(fis);
} finally {
if (fis != null) {
fis.close();
}
}
addProperties(props);
} else {
log("Unable to find property file: " + file.getAbsolutePath(),
Project.MSG_VERBOSE);
}
} catch (IOException ex) {
throw new BuildException(ex, getLocation());
}
}
/**
* load properties from a resource in the current classpath
* @param name name of resource to load
*/
protected void loadResource(String name) {
Properties props = new Properties();
log("Resource Loading " + name, Project.MSG_VERBOSE);
InputStream is = null;
try {
ClassLoader cL = null;
if (classpath != null) {
cL = getProject().createClassLoader(classpath);
} else {
cL = this.getClass().getClassLoader();
}
if (cL == null) {
is = ClassLoader.getSystemResourceAsStream(name);
} else {
is = cL.getResourceAsStream(name);
}
if (is != null) {
props.load(is);
addProperties(props);
} else {
log("Unable to find resource " + name, Project.MSG_WARN);
}
} catch (IOException ex) {
throw new BuildException(ex, getLocation());
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
// ignore
}
}
}
}
/**
* load the environment values
* @param prefix prefix to place before them
*/
protected void loadEnvironment(String prefix) {
Properties props = new Properties();
if (!prefix.endsWith(".")) {
prefix += ".";
}
log("Loading Environment " + prefix, Project.MSG_VERBOSE);
Vector osEnv = Execute.getProcEnvironment();
for (Enumeration e = osEnv.elements(); e.hasMoreElements();) {
String entry = (String) e.nextElement();
int pos = entry.indexOf('=');
if (pos == -1) {
log("Ignoring: " + entry, Project.MSG_WARN);
} else {
props.put(prefix + entry.substring(0, pos),
entry.substring(pos + 1));
}
}
addProperties(props);
}
/**
* iterate through a set of properties,
* resolve them then assign them
*/
protected void addProperties(Properties props) {
resolveAllProperties(props);
Enumeration e = props.keys();
while (e.hasMoreElements()) {
String name = (String) e.nextElement();
String value = props.getProperty(name);
String v = getProject().replaceProperties(value);
if (prefix != null) {
name = prefix + name;
}
addProperty(name, v);
}
}
/**
* add a name value pair to the project property set
* @param n name of property
* @param v value to set
*/
protected void addProperty(String n, String v) {
if (userProperty) {
if (getProject().getUserProperty(n) == null) {
getProject().setInheritedProperty(n, v);
} else {
log("Override ignored for " + n, Project.MSG_VERBOSE);
}
} else {
getProject().setNewProperty(n, v);
}
}
/**
* resolve properties inside a properties hashtable
* @param props properties object to resolve
*/
private void resolveAllProperties(Properties props) throws BuildException {
for (Enumeration e = props.keys(); e.hasMoreElements();) {
String name = (String) e.nextElement();
Stack referencesSeen = new Stack();
resolve(props, name, referencesSeen);
}
}
/**
* Recursively expand the named property using the project's
* reference table and the given set of properties - fail if a
* circular definition is detected.
*
* @param props properties object to resolve
* @param name of the property to resolve
* @param referencesSeen stack of all property names that have
* been tried to expand before coming here.
*/
private void resolve(Properties props, String name, Stack referencesSeen)
throws BuildException {
if (referencesSeen.contains(name)) {
throw new BuildException("Property " + name + " was circularly "
+ "defined.");
}
String value = props.getProperty(name);
Vector fragments = new Vector();
Vector propertyRefs = new Vector();
ProjectHelper.parsePropertyString(value, fragments, propertyRefs);
if (propertyRefs.size() != 0) {
referencesSeen.push(name);
StringBuffer sb = new StringBuffer();
Enumeration i = fragments.elements();
Enumeration j = propertyRefs.elements();
while (i.hasMoreElements()) {
String fragment = (String) i.nextElement();
if (fragment == null) {
String propertyName = (String) j.nextElement();
fragment = getProject().getProperty(propertyName);
if (fragment == null) {
if (props.containsKey(propertyName)) {
resolve(props, propertyName, referencesSeen);
fragment = props.getProperty(propertyName);
} else {
fragment = "${" + propertyName + "}";
}
}
}
sb.append(fragment);
}
value = sb.toString();
props.put(name, value);
referencesSeen.pop();
}
}
}