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/**
* Copyright (C) 2006 Google Inc.
*
* 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 com.google.inject.internal.util;
import static com.google.common.collect.Iterables.concat;
import java.util.List;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;
/**
* Provides access to the calling line of code.
*
* @author crazybob@google.com (Bob Lee)
*/
public final class SourceProvider {
/** Indicates that the source is unknown. */
public static final Object UNKNOWN_SOURCE = "[unknown source]";
private final ImmutableSet<String> classNamesToSkip;
public static final SourceProvider DEFAULT_INSTANCE
= new SourceProvider(ImmutableSet.of(SourceProvider.class.getName()));
private SourceProvider(Iterable<String> classesToSkip) {
this.classNamesToSkip = ImmutableSet.copyOf(classesToSkip);
}
/** Returns a new instance that also skips {@code moreClassesToSkip}. */
public SourceProvider plusSkippedClasses(Class... moreClassesToSkip) {
return new SourceProvider(concat(classNamesToSkip, asStrings(moreClassesToSkip)));
}
/** Returns the class names as Strings */
private static List<String> asStrings(Class... classes) {
List<String> strings = Lists.newArrayList();
for (Class c : classes) {
strings.add(c.getName());
}
return strings;
}
/**
* Returns the calling line of code. The selected line is the nearest to the top of the stack that
* is not skipped.
*/
public StackTraceElement get() {
for (final StackTraceElement element : new Throwable().getStackTrace()) {
String className = element.getClassName();
if (!classNamesToSkip.contains(className)) {
return element;
}
}
throw new AssertionError();
}
}
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