org.codehaus.groovy.ast.expr.Expression Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
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* to you 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.codehaus.groovy.ast.expr;
import org.codehaus.groovy.GroovyBugError;
import org.codehaus.groovy.ast.AnnotatedNode;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import java.util.ArrayList;
import java.util.List;
/**
* Represents a base class for expressions which evaluate as an object
*
* @author James Strachan
*/
public abstract class Expression extends AnnotatedNode {
private ClassNode type=ClassHelper.DYNAMIC_TYPE;
/**
* Return a copy of the expression calling the transformer on any nested expressions
* @param transformer
*/
public abstract Expression transformExpression(ExpressionTransformer transformer);
/**
* Transforms the list of expressions
* @return a new list of transformed expressions
*/
protected List transformExpressions(List expressions, ExpressionTransformer transformer) {
List list = new ArrayList(expressions.size());
for (Expression expr : expressions ) {
list.add(transformer.transform(expr));
}
return list;
}
/**
* Transforms the list of expressions, and checks that all transformed expressions have the given type.
*
* @return a new list of transformed expressions
*/
protected List transformExpressions(List expressions,
ExpressionTransformer transformer, Class transformedType) {
List list = new ArrayList(expressions.size());
for (Expression expr : expressions) {
Expression transformed = transformer.transform(expr);
if (!transformedType.isInstance(transformed))
throw new GroovyBugError(String.format("Transformed expression should have type %s but has type %s",
transformedType, transformed.getClass()));
list.add(transformedType.cast(transformed));
}
return list;
}
public ClassNode getType() {
return type;
}
public void setType(ClassNode t) {
type=t;
}
}