87 lines
2.5 KiB
Java
87 lines
2.5 KiB
Java
/**
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* Copyright (c) 2011-2017, James Zhan 詹波 (jfinal@126.com).
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.jfinal.template.expr.ast;
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import java.util.List;
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import com.jfinal.template.TemplateException;
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import com.jfinal.template.stat.Location;
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import com.jfinal.template.stat.ParseException;
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import com.jfinal.template.stat.Scope;
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/**
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* index : expr '[' expr ']'
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*
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* 支持 a[i]、 a[b[i]]、a[i][j]、a[i][j]...[n]
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*/
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public class Index extends Expr {
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private Expr expr;
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private Expr index;
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public Index(Expr expr, Expr index, Location location) {
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if (expr == null || index == null) {
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throw new ParseException("array/list/map and their index can not be null", location);
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}
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this.expr = expr;
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this.index = index;
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this.location = location;
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}
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@SuppressWarnings("rawtypes")
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public Object eval(Scope scope) {
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Object array = expr.eval(scope);
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if (array == null) {
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if (scope.getCtrl().isNullSafe()) {
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return null;
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}
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throw new TemplateException("The index access operation target can not be null", location);
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}
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Object idx = index.eval(scope);
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if (idx == null) {
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if (scope.getCtrl().isNullSafe()) {
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return null;
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}
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throw new TemplateException("The index of list/array and the key of map can not be null", location);
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}
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if (array instanceof List) {
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if (idx instanceof Integer) {
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return ((List<?>)array).get((Integer)idx);
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}
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throw new TemplateException("The index of list can only be integer", location);
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}
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if (array instanceof java.util.Map) {
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return ((java.util.Map)array).get(idx);
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}
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if (array.getClass().isArray()) {
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if (idx instanceof Integer) {
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return java.lang.reflect.Array.get(array, (Integer)idx);
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}
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throw new TemplateException("The index of array can only be integer", location);
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}
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throw new TemplateException("Only the list array and map is supported by index access", location);
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}
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}
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