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46 package org.codehaus.groovy.ast.expr;
47
48 import java.util.ArrayList;
49 import java.util.Iterator;
50 import java.util.List;
51
52 import org.codehaus.groovy.ast.ClassHelper;
53 import org.codehaus.groovy.ast.GroovyCodeVisitor;
54
55 /***
56 * Represents a String expression which contains embedded values inside
57 * it such as "hello there ${user} how are you" which is expanded lazily
58 *
59 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
60 * @version $Revision: 1.15 $
61 */
62 public class GStringExpression extends Expression {
63
64 private String verbatimText;
65 private List strings = new ArrayList();
66 private List values = new ArrayList();
67
68 public GStringExpression(String verbatimText) {
69 this.verbatimText = verbatimText;
70 super.setType(ClassHelper.GSTRING_TYPE);
71 }
72
73 public GStringExpression(String verbatimText, List strings, List values) {
74 this.verbatimText = verbatimText;
75 this.strings = strings;
76 this.values = values;
77 super.setType(ClassHelper.GSTRING_TYPE);
78 }
79
80 public void visit(GroovyCodeVisitor visitor) {
81 visitor.visitGStringExpression(this);
82 }
83
84 public Expression transformExpression(ExpressionTransformer transformer) {
85 Expression ret = new GStringExpression(
86 verbatimText,
87 transformExpressions(strings, transformer),
88 transformExpressions(values, transformer));
89 ret.setSourcePosition(this);
90 return ret;
91 }
92
93 public String toString() {
94 return super.toString() + "[strings: " + strings + " values: " + values + "]";
95 }
96
97 public String getText() {
98 return verbatimText;
99 }
100
101 public List getStrings() {
102 return strings;
103 }
104
105 public List getValues() {
106 return values;
107 }
108
109 public void addString(ConstantExpression text) {
110 if (text == null) {
111 throw new NullPointerException("Cannot add a null text expression");
112 }
113 strings.add(text);
114 }
115
116 public void addValue(Expression value) {
117
118
119 if (strings.size() == 0)
120 strings.add(ConstantExpression.EMPTY_STRING);
121 values.add(value);
122 }
123
124 public Expression getValue(int idx) {
125 return (Expression) values.get(idx);
126 }
127
128 public boolean isConstantString() {
129 return values.isEmpty();
130 }
131
132 public Expression asConstantString() {
133 StringBuffer buffer = new StringBuffer();
134 for (Iterator iter = strings.iterator(); iter.hasNext();) {
135 ConstantExpression expression = (ConstantExpression) iter.next();
136 Object value = expression.getValue();
137 if (value != null) {
138 buffer.append(value);
139 }
140 }
141 return new ConstantExpression(buffer.toString());
142 }
143 }