/*
* Copyright 2002-2009 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.springframework.expression.spel.ast;
import org.springframework.expression.EvaluationException;
import org.springframework.expression.TypedValue;
import org.springframework.expression.spel.ExpressionState;
/**
* Represents a dot separated sequence of strings that indicate a package qualified type reference.
*
* <p>Example: "java.lang.String" as in the expression "new java.lang.String('hello')"
*
* @author Andy Clement
* @since 3.0
*/
public class QualifiedIdentifier extends SpelNodeImpl {
// TODO safe to cache? dont think so
private TypedValue value;
public QualifiedIdentifier(int pos,SpelNodeImpl... operands) {
super(pos,operands);
}
@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
// Cache the concatenation of child identifiers
if (this.value == null) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < getChildCount(); i++) {
Object value = children[i].getValueInternal(state).getValue();
if (i > 0 && !value.toString().startsWith("$")) {
sb.append(".");
}
sb.append(value);
}
this.value = new TypedValue(sb.toString());
}
return this.value;
}
@Override
public String toStringAST() {
StringBuilder sb = new StringBuilder();
if (this.value != null) {
sb.append(this.value.getValue());
} else {
for (int i = 0; i < getChildCount(); i++) {
if (i > 0) {
sb.append(".");
}
sb.append(getChild(i).toStringAST());
}
}
return sb.toString();
}
}
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