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Groovy: A powerful, dynamic language for the JVM
/*
* Copyright 2003-2007 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.codehaus.groovy.ast.expr;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.GroovyCodeVisitor;
/**
* Represents a String expression which contains embedded values inside
* it such as "hello there ${user} how are you" which is expanded lazily
*
* @author James Strachan
* @version $Revision: 6778 $
*/
public class GStringExpression extends Expression {
private String verbatimText;
private List strings = new ArrayList();
private List values = new ArrayList();
public GStringExpression(String verbatimText) {
this.verbatimText = verbatimText;
super.setType(ClassHelper.GSTRING_TYPE);
}
public GStringExpression(String verbatimText, List strings, List values) {
this.verbatimText = verbatimText;
this.strings = strings;
this.values = values;
super.setType(ClassHelper.GSTRING_TYPE);
}
public void visit(GroovyCodeVisitor visitor) {
visitor.visitGStringExpression(this);
}
public Expression transformExpression(ExpressionTransformer transformer) {
Expression ret = new GStringExpression(
verbatimText,
transformExpressions(strings, transformer),
transformExpressions(values, transformer));
ret.setSourcePosition(this);
return ret;
}
public String toString() {
return super.toString() + "[strings: " + strings + " values: " + values + "]";
}
public String getText() {
return verbatimText;
}
public List getStrings() {
return strings;
}
public List getValues() {
return values;
}
public void addString(ConstantExpression text) {
if (text == null) {
throw new NullPointerException("Cannot add a null text expression");
}
strings.add(text);
}
public void addValue(Expression value) {
// If the first thing is an value, then we need a dummy empty string in front of it so that when we
// toString it they come out in the correct order.
if (strings.size() == 0)
strings.add(ConstantExpression.EMPTY_STRING);
values.add(value);
}
public Expression getValue(int idx) {
return (Expression) values.get(idx);
}
public boolean isConstantString() {
return values.isEmpty();
}
public Expression asConstantString() {
StringBuffer buffer = new StringBuffer();
for (Iterator iter = strings.iterator(); iter.hasNext();) {
ConstantExpression expression = (ConstantExpression) iter.next();
Object value = expression.getValue();
if (value != null) {
buffer.append(value);
}
}
return new ConstantExpression(buffer.toString());
}
}