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/*
* 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.property;
import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
/**
* Class to resolve properties in a map. This class is explicitly not threadsafe.
* @since Ant 1.8.0
*/
public class ResolvePropertyMap implements GetProperty {
private final Set<String> seen = new HashSet<String>();
private final ParseProperties parseProperties;
private final GetProperty master;
private Map<String, Object> map;
private String prefix;
// whether properties of the value side of the map should be
// expanded
private boolean prefixValues = false;
// whether the current getProperty call is expanding the key side
// of the map
private boolean expandingLHS = true;
/**
* Constructor with a master getproperty and a collection of expanders.
* @param project the current ant project.
* @param master the master property holder (usually PropertyHelper)
* @param expanders a collection of expanders (usually from PropertyHelper).
*/
public ResolvePropertyMap(Project project, GetProperty master, Collection<PropertyExpander> expanders) {
this.master = master;
this.parseProperties = new ParseProperties(project, expanders, this);
}
/**
* Returns the value of a property if it is set.
* @param name name of the property.
* @return the property value, or null for no match or for name being null.
*/
public Object getProperty(String name) {
if (seen.contains(name)) {
throw new BuildException(
"Property " + name + " was circularly " + "defined.");
}
try {
// If the property we are looking up is a key in the map
// (first call into this method from resolveAllProperties)
// or we've been asked to prefix the value side (later
// recursive calls via the GetProperty interface) the
// prefix must be prepended when looking up the property
// outside of the map.
String fullKey = name;
if (prefix != null && (expandingLHS || prefixValues)) {
fullKey = prefix + name;
}
Object masterValue = master.getProperty(fullKey);
if (masterValue != null) {
// If the property already has a value outside of the
// map, use that value to enforce property
// immutability.
return masterValue;
}
seen.add(name);
String recursiveCallKey = name;
if (prefix != null && !expandingLHS && !prefixValues) {
// only look up unprefixed properties inside the map
// if prefixValues is true or we are expanding the key
// itself
recursiveCallKey = prefix + name;
}
expandingLHS = false;
// will recurse into this method for each property
// reference found in the map's value
return parseProperties.parseProperties((String) map.get(recursiveCallKey));
} finally {
seen.remove(name);
}
}
/**
* The action method - resolves all the properties in a map.
* @param map the map to resolve properties in.
* @deprecated since Ant 1.8.2, use the three-arg method instead.
*/
public void resolveAllProperties(Map<String, Object> map) {
resolveAllProperties(map, null, false);
}
/**
* The action method - resolves all the properties in a map.
* @param map the map to resolve properties in.
* @param prefix the prefix the properties defined inside the map
* will finally receive - may be null.
* @deprecated since Ant 1.8.2, use the three-arg method instead.
*/
public void resolveAllProperties(Map<String, Object> map, String prefix) {
resolveAllProperties(map, null, false);
}
/**
* The action method - resolves all the properties in a map.
* @param map the map to resolve properties in.
* @param prefix the prefix the properties defined inside the map
* will finally receive - may be null.
* @param prefixValues - whether the prefix will be applied
* to properties on the value side of the map as well.
*/
public void resolveAllProperties(Map<String, Object> map, String prefix,
boolean prefixValues) {
// The map, prefix and prefixValues flag get used in the
// getProperty callback
this.map = map;
this.prefix = prefix;
this.prefixValues = prefixValues;
for (String key : map.keySet()) {
expandingLHS = true;
Object result = getProperty(key);
String value = result == null ? "" : result.toString();
map.put(key, value);
}
}
}
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