Source code: ognl/ASTChain.java
1 //--------------------------------------------------------------------------
2 // Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
3 // All rights reserved.
4 //
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions are
7 // met:
8 //
9 // Redistributions of source code must retain the above copyright notice,
10 // this list of conditions and the following disclaimer.
11 // Redistributions in binary form must reproduce the above copyright
12 // notice, this list of conditions and the following disclaimer in the
13 // documentation and/or other materials provided with the distribution.
14 // Neither the name of the Drew Davidson nor the names of its contributors
15 // may be used to endorse or promote products derived from this software
16 // without specific prior written permission.
17 //
18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 // COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25 // OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 // AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
28 // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
29 // DAMAGE.
30 //--------------------------------------------------------------------------
31 package ognl;
32
33 import java.lang.reflect.Array;
34
35 /**
36 * @author Luke Blanshard (blanshlu@netscape.net)
37 * @author Drew Davidson (drew@ognl.org)
38 */
39 class ASTChain extends SimpleNode
40 {
41 public ASTChain(int id) {
42 super(id);
43 }
44
45 public ASTChain(OgnlParser p, int id) {
46 super(p, id);
47 }
48
49 public void jjtClose() {
50 flattenTree();
51 }
52
53 protected Object getValueBody( OgnlContext context, Object source ) throws OgnlException
54 {
55 Object result = source;
56
57 for ( int i = 0, ilast = children.length - 1; i <= ilast; ++i ) {
58 boolean handled = false;
59
60 if (i < ilast) {
61 if (children[i] instanceof ASTProperty) {
62 ASTProperty propertyNode = (ASTProperty)children[i];
63 int indexType = propertyNode.getIndexedPropertyType(context, result);
64
65 if ((indexType != OgnlRuntime.INDEXED_PROPERTY_NONE) && (children[i + 1] instanceof ASTProperty)) {
66 ASTProperty indexNode = (ASTProperty)children[i + 1];
67
68 if (indexNode.isIndexedAccess()) {
69 Object index = indexNode.getProperty(context, result);
70
71 if (index instanceof DynamicSubscript) {
72 if (indexType == OgnlRuntime.INDEXED_PROPERTY_INT) {
73 Object array = propertyNode.getValue(context, result);
74 int len = Array.getLength(array);
75
76 switch (((DynamicSubscript)index).getFlag()) {
77 case DynamicSubscript.ALL:
78 result = Array.newInstance( array.getClass().getComponentType(), len );
79 System.arraycopy( array, 0, result, 0, len );
80 handled = true;
81 i++;
82 break;
83 case DynamicSubscript.FIRST:
84 index = new Integer((len > 0) ? 0 : -1);
85 break;
86 case DynamicSubscript.MID:
87 index = new Integer((len > 0) ? (len / 2) : -1);
88 break;
89 case DynamicSubscript.LAST:
90 index = new Integer((len > 0) ? (len - 1) : -1);
91 break;
92 }
93 } else {
94 if (indexType == OgnlRuntime.INDEXED_PROPERTY_OBJECT) {
95 throw new OgnlException("DynamicSubscript '" + indexNode + "' not allowed for object indexed property '" + propertyNode + "'");
96 }
97 }
98 }
99 if (!handled) {
100 result = OgnlRuntime.getIndexedProperty(context, result, propertyNode.getProperty(context, result).toString(), index);
101 handled = true;
102 i++;
103 }
104 }
105 }
106 }
107 }
108 if (!handled) {
109 result = children[i].getValue( context, result );
110 }
111 }
112 return result;
113 }
114
115 protected void setValueBody( OgnlContext context, Object target, Object value ) throws OgnlException
116 {
117 boolean handled = false;
118
119 for ( int i = 0, ilast = children.length - 2; i <= ilast; ++i ) {
120 if (i == ilast) {
121 if (children[i] instanceof ASTProperty) {
122 ASTProperty propertyNode = (ASTProperty)children[i];
123 int indexType = propertyNode.getIndexedPropertyType(context, target);
124
125 if ((indexType != OgnlRuntime.INDEXED_PROPERTY_NONE) && (children[i + 1] instanceof ASTProperty)) {
126 ASTProperty indexNode = (ASTProperty)children[i + 1];
127
128 if (indexNode.isIndexedAccess()) {
129 Object index = indexNode.getProperty(context, target);
130
131 if (index instanceof DynamicSubscript) {
132 if (indexType == OgnlRuntime.INDEXED_PROPERTY_INT) {
133 Object array = propertyNode.getValue(context, target);
134 int len = Array.getLength(array);
135
136 switch (((DynamicSubscript)index).getFlag()) {
137 case DynamicSubscript.ALL:
138 System.arraycopy(target, 0, value, 0, len);
139 handled = true;
140 i++;
141 break;
142 case DynamicSubscript.FIRST:
143 index = new Integer((len > 0) ? 0 : -1);
144 break;
145 case DynamicSubscript.MID:
146 index = new Integer((len > 0) ? (len / 2) : -1);
147 break;
148 case DynamicSubscript.LAST:
149 index = new Integer((len > 0) ? (len - 1) : -1);
150 break;
151 }
152 } else {
153 if (indexType == OgnlRuntime.INDEXED_PROPERTY_OBJECT) {
154 throw new OgnlException("DynamicSubscript '" + indexNode + "' not allowed for object indexed property '" + propertyNode + "'");
155 }
156 }
157 }
158 if (!handled) {
159 OgnlRuntime.setIndexedProperty(context, target, propertyNode.getProperty(context, target).toString(), index, value);
160 handled = true;
161 i++;
162 }
163 }
164 }
165 }
166 }
167 if (!handled) {
168 target = children[i].getValue( context, target );
169 }
170 }
171 if (!handled) {
172 children[children.length - 1].setValue( context, target, value );
173 }
174 }
175
176 public boolean isSimpleNavigationChain( OgnlContext context ) throws OgnlException
177 {
178 boolean result = false;
179
180 if ((children != null) && (children.length > 0)) {
181 result = true;
182 for (int i = 0; result && (i < children.length); i++) {
183 if (children[i] instanceof SimpleNode) {
184 result = ((SimpleNode)children[i]).isSimpleProperty(context);
185 } else {
186 result = false;
187 }
188 }
189 }
190 return result;
191 }
192
193 public String toString()
194 {
195 String result = "";
196
197 if ((children != null) && (children.length > 0)) {
198 for (int i = 0; i < children.length; i++) {
199 if (i > 0) {
200 if (!(children[i] instanceof ASTProperty) || !((ASTProperty)children[i]).isIndexedAccess()) {
201 result = result + ".";
202 }
203 }
204 result += children[i].toString();
205 }
206 }
207 return result;
208 }
209 }