/*
 * Copyright 2002-2017 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;
import org.springframework.lang.Nullable;

Represents a dot separated sequence of strings that indicate a package qualified type reference.

Example: "java.lang.String" as in the expression "new java.lang.String('hello')"

Author:Andy Clement
Since:3.0
/** * 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 { @Nullable 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 = this.children[i].getValueInternal(state).getValue(); if (i > 0 && (value == null || !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(); } }