/*
* Copyright 2011 the original author or authors.
*
* 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.gradle.internal.nativeintegration;
import org.gradle.internal.os.OperatingSystem;
import java.lang.reflect.Field;
import java.util.Map;
/**
* Uses reflection to update private environment state
*/
public class ReflectiveEnvironment {
public void unsetenv(String name) {
Map<String, String> map = getEnv();
map.remove(name);
if (OperatingSystem.current().isWindows()) {
Map<String, String> env2 = getWindowsEnv();
env2.remove(name);
}
}
public void setenv(String name, String value) {
Map<String, String> map = getEnv();
map.put(name, value);
if (OperatingSystem.current().isWindows()) {
Map<String, String> env2 = getWindowsEnv();
env2.put(name, value);
}
}
/**
* Windows keeps an extra map with case insensitive keys. The map is used when the user calls {@link System#getenv(String)}
*/
private Map<String, String> getWindowsEnv() {
try {
Class<?> sc = Class.forName("java.lang.ProcessEnvironment");
Field caseinsensitive = sc.getDeclaredField("theCaseInsensitiveEnvironment");
caseinsensitive.setAccessible(true);
@SuppressWarnings("unchecked")
Map<String, String> result = (Map<String, String>)caseinsensitive.get(null);
return result;
} catch (Exception e) {
throw new NativeIntegrationException("Unable to get mutable windows case insensitive environment map", e);
}
}
private Map<String, String> getEnv() {
try {
Map<String, String> theUnmodifiableEnvironment = System.getenv();
Class<?> cu = theUnmodifiableEnvironment.getClass();
Field m = cu.getDeclaredField("m");
m.setAccessible(true);
@SuppressWarnings("unchecked")
Map<String, String> result = (Map<String, String>)m.get(theUnmodifiableEnvironment);
return result;
} catch (Exception e) {
throw new NativeIntegrationException("Unable to get mutable environment map", e);
}
}
}