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/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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 vogar;
import java.util.regex.Pattern;
/**
* The expected result of an action execution. This is typically encoded in the
* expectations text file, which has the following format:
* <pre>
* test java.io.StreamTokenizer.Reset
* result UNSUPPORTED
* pattern .*should get token \[, but get -1.*
*
* # should we fix this?
* test java.util.Arrays.CopyMethods
* result COMPILE_FAILED
* pattern .*cannot find symbol.*
* </pre>
*/
final class Expectation {
/** The pattern to use when no expected output is specified */
private static final Pattern MATCH_ALL_PATTERN
= Pattern.compile(".*", Pattern.MULTILINE | Pattern.DOTALL);
/** The expectation of a general successful run. */
static final Expectation SUCCESS = new Expectation(Result.SUCCESS, null);
/** The action's expected result, such as {@code EXEC_FAILED}. */
private final Result result;
/** The pattern the expected output will match. */
private final Pattern pattern;
public Expectation(Result result, String pattern) {
if (result == null) {
throw new IllegalArgumentException();
}
this.result = result;
this.pattern = pattern != null
? Pattern.compile(pattern, Pattern.MULTILINE | Pattern.DOTALL)
: MATCH_ALL_PATTERN;
}
public Result getResult() {
return result;
}
/**
* Returns true if {@code outcome} matches this expectation.
*/
public boolean matches(Outcome outcome) {
return result == outcome.getResult() && patternMatches(outcome);
}
/**
* Returns the failure message for this failed run. This message is intended
* to help to diagnose why the run result didn't match what was expected.
*/
public String getFailureMessage(Outcome outcome) {
StringBuilder builder = new StringBuilder();
if (result != Result.SUCCESS && result != outcome.getResult()) {
builder.append("Expected result: ")
.append(result)
.append("\n");
}
if (!patternMatches(outcome)) {
builder.append("Expected output to match \"")
.append(pattern.pattern())
.append("\"\n");
}
for (String output : outcome.getOutputLines()) {
builder.append(output).append("\n");
}
return builder.toString();
}
private boolean patternMatches(Outcome outcome) {
return pattern.matcher(Strings.join(outcome.getOutputLines(), "\n")).matches();
}
}
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