/*
* Copyright 2007 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.api.internal;
import groovy.lang.Closure;
import groovy.lang.MissingPropertyException;
import org.gradle.api.InvalidUserDataException;
import org.gradle.api.internal.plugins.DefaultConvention;
import org.gradle.api.plugins.Convention;
import org.gradle.internal.reflect.JavaReflectionUtil;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Callable;
import static org.gradle.util.GUtil.uncheckedCall;
public class ConventionAwareHelper implements ConventionMapping, HasConvention {
//prefix internal fields with _ so that they don't get into the way of propertyMissing()
private final Convention _convention;
private final IConventionAware _source;
private final Set<String> _propertyNames;
private final Map<String, MappedPropertyImpl> _mappings = new HashMap<String, MappedPropertyImpl>();
/**
* @see org.gradle.api.internal.AsmBackedClassGenerator.ClassBuilderImpl#mixInConventionAware()
*/
public ConventionAwareHelper(IConventionAware source) {
this(source, new DefaultConvention());
}
public ConventionAwareHelper(IConventionAware source, Convention convention) {
this._source = source;
this._convention = convention;
this._propertyNames = JavaReflectionUtil.propertyNames(source);
}
private interface Value<T> {
T getValue(Convention convention, IConventionAware conventionAwareObject);
}
private MappedProperty map(String propertyName, Value<?> value) {
if (!_propertyNames.contains(propertyName)) {
throw new InvalidUserDataException(
"You can't map a property that does not exist: propertyName=" + propertyName);
}
MappedPropertyImpl mappedProperty = new MappedPropertyImpl(value);
_mappings.put(propertyName, mappedProperty);
return mappedProperty;
}
public MappedProperty map(String propertyName, final Closure<?> value) {
return map(propertyName, new Value<Object>() {
public Object getValue(Convention convention, IConventionAware conventionAwareObject) {
switch (value.getMaximumNumberOfParameters()) {
case 0:
return value.call();
case 1:
return value.call(convention);
default:
return value.call(convention, conventionAwareObject);
}
}
});
}
public MappedProperty map(String propertyName, final Callable<?> value) {
return map(propertyName, new Value<Object>() {
public Object getValue(Convention convention, IConventionAware conventionAwareObject) {
return uncheckedCall(value);
}
});
}
public void propertyMissing(String name, Object value) {
if (value instanceof Closure) {
map(name, (Closure) value);
} else {
throw new MissingPropertyException(name, getClass());
}
}
public <T> T getConventionValue(T actualValue, String propertyName, boolean isExplicitValue) {
if (isExplicitValue) {
return actualValue;
}
Object returnValue = actualValue;
if (_mappings.containsKey(propertyName)) {
boolean useMapping = true;
if (actualValue instanceof Collection && !((Collection<?>) actualValue).isEmpty()) {
useMapping = false;
} else if (actualValue instanceof Map && !((Map<?, ?>) actualValue).isEmpty()) {
useMapping = false;
}
if (useMapping) {
returnValue = _mappings.get(propertyName).getValue(_convention, _source);
}
}
return (T) returnValue;
}
public Convention getConvention() {
return _convention;
}
private static class MappedPropertyImpl implements MappedProperty {
private final Value<?> value;
private boolean haveValue;
private boolean cache;
private Object cachedValue;
private MappedPropertyImpl(Value<?> value) {
this.value = value;
}
public Object getValue(Convention convention, IConventionAware conventionAwareObject) {
if (!cache) {
return value.getValue(convention, conventionAwareObject);
}
if (!haveValue) {
cachedValue = value.getValue(convention, conventionAwareObject);
haveValue = true;
}
return cachedValue;
}
public void cache() {
cache = true;
cachedValue = null;
}
}
}