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1
22
23 package org.xquark.extractor.xfunctions;
24
25 import java.util.ArrayList  ;
26 import java.util.List ;
27
28 import org.xquark.extractor.algebra.Expression;
29 import org.xquark.extractor.common.Debug;
30
31 public abstract class XFunction extends Expression {
32 private String _functionName;
33 protected List _arguments;
34
35
38 public XFunction() {
39 }
40 public XFunction(String functionName) {
41 setFunctionName(functionName);
42 }
43
48 public XFunction(String functionName, List arguments) {
49 setFunctionName(functionName);
50 setArguments(arguments);
51 }
52
53
58 public String getFunctionName() {
59 return _functionName;
60 }
61
62
67 public void setFunctionName(String functionName) {
68 _functionName = functionName;
69 }
70
71
76 public List getArguments() {
77 return _arguments;
78 }
79
80 public List getOperands()
81 {
82 return _arguments;
83 }
84
89 public void setArguments(List aArguments) {
90 _arguments = aArguments;
91 if (null != _arguments) {
92 for (int i = 0; i < _arguments.size(); i++) {
93 ((Expression)_arguments.get(i)).setFather(this);
94 }
95 }
96 }
97
98 public int getArgumentNumber() {
99 if (null != _arguments) {
100 return _arguments.size();
101 }
102 else {
103 return 0;
104 }
105 }
106
107 public Expression getArgument(int index ) {
108 if (null != _arguments) {
109 if (_arguments.size()> index) {
110 return (Expression)_arguments.get(index);
111 }
112 else {
113 return null;
114 }
115 }
116 else {
117 return null;
118 }
119 }
120
121 public void setArgument(int index, Expression argument) {
122 Debug.assertTrue( null!=argument, "null!=argument");
123 if (null == _arguments ) {
124 _arguments = new ArrayList ();
125 }
126 while( index >_arguments.size()-1) {
127 _arguments.add(null);
128 }
129 _arguments.set(index,argument);
130 argument.setFather(this);
131 }
132
133 public boolean replaceChild(Expression oldChild, Expression newChild)
134 {
135 boolean retVal = false;
136
137 if (null != _arguments) {
138 Object child = null;
139 for (int i = 0; i < _arguments.size(); i++) {
140 child = _arguments.get(i);
141 if ( oldChild.equals(child)) {
142 _arguments.set(i,newChild);
143 retVal = true;
144 break;
145 }
146 }
147 }
148 else {
149
150 }
151
152 return retVal;
153 }
154
155 public String pprint()
156 {
157 StringBuffer retVal = new StringBuffer ();
158 retVal.append(getFunctionName());
159 retVal.append("(");
160 if ( null != _arguments) {
161 Expression argument = null;
162 for (int i = 0; i < _arguments.size(); i++) {
163 argument = (Expression)_arguments.get(i);
164 retVal.append(argument.pprint());
165 retVal.append(",");
166 }
167 retVal.delete(retVal.length(),retVal.length());
168 }
169 retVal.append(")");
170 return retVal.toString();
171 }
172
173
176 public boolean deepEquals(Object o)
177 {
178 if (o instanceof XFunction)
179 {
180 XFunction cast = (XFunction)o;
181 int len = _arguments.size(), i;
182 boolean ret = _functionName.equalsIgnoreCase(cast.getFunctionName())
183 && (len == cast.getArguments().size());
184
185 for (i = 0; ret && i < len; i++)
186 ret &= ((Expression)_arguments.get(i)).deepEquals(cast.getArguments().get(i));
187 return ret;
188 }
189 return false;
190 }
191 }
192
193 |
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