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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: 1.14 $
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 return new GStringExpression(
86 verbatimText,
87 transformExpressions(strings, transformer),
88 transformExpressions(values, transformer));
89 }
90
91 public String toString() {
92 return super.toString() + "[strings: " + strings + " values: " + values + "]";
93 }
94
95 public String getText() {
96 return verbatimText;
97 }
98
99 public List getStrings() {
100 return strings;
101 }
102
103 public List getValues() {
104 return values;
105 }
106
107 public void addString(ConstantExpression text) {
108 if (text == null) {
109 throw new NullPointerException("Cannot add a null text expression");
110 }
111 strings.add(text);
112 }
113
114 public void addValue(Expression value) {
115
116
117 if (strings.size() == 0)
118 strings.add(ConstantExpression.EMPTY_STRING);
119 values.add(value);
120 }
121
122 public Expression getValue(int idx) {
123 return (Expression) values.get(idx);
124 }
125
126 public boolean isConstantString() {
127 return values.isEmpty();
128 }
129
130 public Expression asConstantString() {
131 StringBuffer buffer = new StringBuffer();
132 for (Iterator iter = strings.iterator(); iter.hasNext();) {
133 ConstantExpression expression = (ConstantExpression) iter.next();
134 Object value = expression.getValue();
135 if (value != null) {
136 buffer.append(value);
137 }
138 }
139 return new ConstantExpression(buffer.toString());
140 }
141 }