/**
* Copyright 2011-2017 Asakusa Framework Team.
*
* 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.asakusafw.testdriver.excel;
import java.lang.ref.Reference;
import java.lang.ref.SoftReference;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.ServiceLoader;
import java.util.WeakHashMap;
import com.asakusafw.testdriver.core.PropertyName;
import com.asakusafw.testdriver.core.PropertyType;
import com.asakusafw.testdriver.core.VerifyContext;
import com.asakusafw.testdriver.rule.ValuePredicate;
/**
* A repository for {@link ExcelSheetRuleExtension}.
* @since 0.7.0
*/
class ExcelSheetRuleExtensionRepository implements ExcelSheetRuleExtension {
private static final Map<ClassLoader, Reference<ExcelSheetRuleExtensionRepository>> CACHE = new WeakHashMap<>();
/**
* Returns a {@link ExcelSheetRuleExtensionRepository} for the target context.
* @param context the target context
* @return a repository object
* @throws IllegalArgumentException if some parameters were {@code null}
*/
public static ExcelSheetRuleExtensionRepository get(VerifyContext context) {
if (context == null) {
throw new IllegalArgumentException("context must not be null"); //$NON-NLS-1$
}
Reference<ExcelSheetRuleExtensionRepository> ref = CACHE.get(context.getTestContext().getClassLoader());
ExcelSheetRuleExtensionRepository cached = ref == null ? null : ref.get();
if (cached != null) {
return cached;
}
ExcelSheetRuleExtensionRepository created = newInstance(context);
setCached(context, created);
return created;
}
static void setCached(VerifyContext context, ExcelSheetRuleExtensionRepository repository) {
Reference<ExcelSheetRuleExtensionRepository> ref;
if (repository.getClass().getClassLoader() == ClassLoader.getSystemClassLoader()) {
ref = new SoftReference<>(repository);
} else {
ref = new WeakReference<>(repository);
}
CACHE.put(context.getTestContext().getClassLoader(), ref);
}
private static ExcelSheetRuleExtensionRepository newInstance(VerifyContext context) {
ClassLoader classLoader = context.getTestContext().getClassLoader();
List<ExcelSheetRuleExtension> extensions = new ArrayList<>();
for (ExcelSheetRuleExtension extension : ServiceLoader.load(ExcelSheetRuleExtension.class, classLoader)) {
extensions.add(extension);
}
return new ExcelSheetRuleExtensionRepository(extensions);
}
private final List<? extends ExcelSheetRuleExtension> extensions;
/**
* Creates a new instance.
* @param extensions the extensions
* @throws IllegalArgumentException if some parameters were {@code null}
*/
ExcelSheetRuleExtensionRepository(List<? extends ExcelSheetRuleExtension> extensions) {
if (extensions == null) {
throw new IllegalArgumentException("extensions must not be null"); //$NON-NLS-1$
}
this.extensions = extensions;
}
@Override
public ValuePredicate<?> resolve(
VerifyContext context,
PropertyName name,
PropertyType type,
String expression) throws ExcelRuleExtractor.FormatException {
for (ExcelSheetRuleExtension extension : extensions) {
ValuePredicate<?> resolved = extension.resolve(context, name, type, expression);
if (resolved != null) {
return resolved;
}
}
return null;
}
}