/**
* Copyright 2011-2014 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.utils.java.internal.model.syntax;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Map;
import java.util.WeakHashMap;
import com.asakusafw.utils.java.internal.model.util.ModelDigester;
import com.asakusafw.utils.java.internal.model.util.ModelEmitter;
import com.asakusafw.utils.java.internal.model.util.ModelMatcher;
import com.asakusafw.utils.java.internal.model.util.PrintEmitContext;
import com.asakusafw.utils.java.model.syntax.Model;
/**
* {@link Model}の基底となるクラス。
*/
abstract class ModelRoot implements Model {
private Map<Class<?>, Object> traits;
@Override
public <T> T findModelTrait(Class<T> traitClass) {
if (traitClass == null) {
throw new IllegalArgumentException("traitClass must not be null"); //$NON-NLS-1$
}
if (traits == null) {
return null;
}
Object adapter = traits.get(traitClass);
if (adapter == null) {
return null;
}
return traitClass.cast(adapter);
}
@Override
public <T> void putModelTrait(Class<T> traitClass, T traitObject) {
if (traitClass == null) {
throw new IllegalArgumentException("traitClass must not be null"); //$NON-NLS-1$
}
if (traitObject == null) {
if (traits != null) {
traits.remove(traitClass);
}
} else {
assert traitClass.isInstance(traitObject);
if (traits == null) {
traits = new WeakHashMap<Class<?>, Object>(4, 0.75f);
}
traits.put(traitClass, traitObject);
}
}
@Override
public int hashCode() {
return ModelDigester.compute(this);
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if ((obj instanceof Model) == false) {
return false;
}
return accept(ModelMatcher.INSTANCE, (Model) obj) ;
}
@Override
public String toString() {
StringWriter buffer = new StringWriter();
PrintWriter output = new PrintWriter(buffer);
try {
ModelEmitter.emit(this, new PrintEmitContext(output));
} catch (RuntimeException e) {
e.printStackTrace(output);
}
output.flush();
return buffer.toString();
}
}