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| org.apache.commons.jexl.parser.ASTForeachStatement |
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| 1 | /* |
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| 2 | * Copyright 2002-2006 The Apache Software Foundation. |
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| 3 | * |
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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| 5 | * you may not use this file except in compliance with the License. |
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| 6 | * You may obtain a copy of the License at |
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| 7 | * |
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 9 | * |
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| 10 | * Unless required by applicable law or agreed to in writing, software |
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 13 | * See the License for the specific language governing permissions and |
|
| 14 | * limitations under the License. |
|
| 15 | */ |
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| 16 | ||
| 17 | package org.apache.commons.jexl.parser; |
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| 18 | ||
| 19 | import java.util.Iterator; |
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| 20 | ||
| 21 | import org.apache.commons.jexl.JexlContext; |
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| 22 | import org.apache.commons.jexl.util.Introspector; |
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| 23 | import org.apache.commons.jexl.util.introspection.Info; |
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| 24 | ||
| 25 | /** |
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| 26 | * ForEach statement. Syntax: foreach (var in iterable) Statement() |
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| 27 | * |
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| 28 | * @author Dion Gillard |
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| 29 | * @since 1.1 |
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| 30 | */ |
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| 31 | public class ASTForeachStatement extends SimpleNode { |
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| 32 | /** dummy velocity info. */ |
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| 33 | 1 | private static final Info DUMMY = new Info("", 1, 1); |
| 34 | /** index of the loop variable. */ |
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| 35 | private static final int VAR_INDEX = 0; |
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| 36 | /** index of the items. */ |
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| 37 | private static final int ITEMS_INDEX = 1; |
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| 38 | /** index of the code to execute. */ |
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| 39 | private static final int STATEMENT_INDEX = 2; |
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| 40 | ||
| 41 | ||
| 42 | /** |
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| 43 | * Create the node given an id. |
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| 44 | * |
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| 45 | * @param id node id. |
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| 46 | */ |
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| 47 | public ASTForeachStatement(int id) { |
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| 48 | 0 | super(id); |
| 49 | 0 | } |
| 50 | ||
| 51 | /** |
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| 52 | * Create a node with the given parser and id. |
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| 53 | * |
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| 54 | * @param p a parser. |
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| 55 | * @param id node id. |
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| 56 | */ |
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| 57 | public ASTForeachStatement(Parser p, int id) { |
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| 58 | 10 | super(p, id); |
| 59 | 10 | } |
| 60 | ||
| 61 | /** {@inheritDoc} */ |
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| 62 | public Object jjtAccept(ParserVisitor visitor, Object data) { |
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| 63 | 0 | return visitor.visit(this, data); |
| 64 | } |
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| 65 | ||
| 66 | /** {@inheritDoc} */ |
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| 67 | public Object value(JexlContext jc) throws Exception { |
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| 68 | 10 | Object result = null; |
| 69 | /* first child is the loop variable */ |
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| 70 | 10 | ASTReference loopVariable = (ASTReference) jjtGetChild(VAR_INDEX); |
| 71 | /* second child is the variable to iterate */ |
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| 72 | 10 | SimpleNode iterable = (SimpleNode) jjtGetChild(ITEMS_INDEX); |
| 73 | 10 | Object iterableValue = iterable.value(jc); |
| 74 | // make sure there is a value to iterate on and a statement to execute |
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| 75 | 10 | if (iterableValue != null && jjtGetNumChildren() >= (STATEMENT_INDEX + 1)) { |
| 76 | /* third child is the statement to execute */ |
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| 77 | 8 | SimpleNode statement = (SimpleNode) jjtGetChild(2); |
| 78 | // get an iterator for the collection/array etc via the |
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| 79 | // introspector. |
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| 80 | 8 | Iterator itemsIterator = Introspector.getUberspect().getIterator( |
| 81 | iterableValue, DUMMY); |
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| 82 | 123 | while (itemsIterator.hasNext()) { |
| 83 | // set loopVariable to value of iterator |
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| 84 | 107 | Object value = itemsIterator.next(); |
| 85 | 107 | jc.getVars().put(loopVariable.getRootString(), value); |
| 86 | // execute statement |
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| 87 | 107 | result = statement.value(jc); |
| 88 | } |
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| 89 | } |
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| 90 | 10 | return result; |
| 91 | } |
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| 92 | } |
| This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |