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VarDef.java
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package act.view;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* 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.
* #L%
*/
import act.util.ActContext;
import org.osgl.inject.BeanSpec;
import org.osgl.util.E;
import org.osgl.util.S;
/**
* Defines an implicit variable
*/
public abstract class VarDef {
private String name;
private String type;
/**
* Construct an implicit variable by name and type
*
* @param name the name of the variable. Could be referenced in
* view template to get the variable
* @param type the type of the variable. Some view solution e.g.
* Rythm needs to explicitly declare the template
* arguments. And type information is used by those
* static template engines
*/
protected VarDef(String name, Class<?> type) {
E.illegalArgumentIf(S.blank(name), "VarDef name cannot be empty");
this.name = name;
this.type = type.getCanonicalName().replace('$', '.');
}
/**
* Construct an implicit variable by name and {@link BeanSpec bean spec}
*
* @param name the name of the variable. Could be referenced in
* view template to get the variable
* @param type the {@link BeanSpec} of the variable. Some view solution e.g.
* Rythm needs to explicitly declare the template
* arguments. And type information is used by those
* static template engines
*/
protected VarDef(String name, BeanSpec type) {
E.illegalArgumentIf(S.blank(name), "VarDef name cannot be empty");
this.name = name;
this.type = toString(type);
}
public String name() {
return name;
}
public String type() {
return type;
}
/**
* A specific variable implementation shall override this method to
* evaluate the variable value at runtime
*
* @param context The application context
* @return the variable value
*/
public abstract Object evaluate(ActContext context);
@Override
public String toString() {
return S.fmt("%s|%s", name, type);
}
@Override
public int hashCode() {
return name.hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof VarDef) {
VarDef that = (VarDef) obj;
return that.name.equals(name);
}
return false;
}
private static String toString(BeanSpec spec) {
if (spec.typeParams().isEmpty()) {
return spec.rawType().getName();
} else {
return spec.type().toString();
}
}
}