Example usage for org.eclipse.jdt.core.dom TagElement getProperty

Introduction

In this page you can find the example usage for org.eclipse.jdt.core.dom TagElement getProperty.

Prototype

public final Object getProperty(String propertyName) 

Source Link

Document

Returns the value of the named property of this node, or null if none.

Usage

From source file:org.eclipse.wb.internal.core.model.JavaInfoEvaluationHelper.java

License:Open Source License

/**
 * Evaluates value of expression specified in JavaDoc comments like this:
 * // w  w  w  .  ja  v  a 2 s .  c  o m
 * @wbp.eval.method.parameter someName someExpression
 * 
 * @param javadoc
 *          the {@link Javadoc} that should be checked.
 * @param tagName
 *          the name of tag, "@wbp.eval.method.parameter" in example above.
 * @param expectedName
 *          the name of expression, "someName" in example above.
 */
public static Object evaluateJavadocTagExpression(AstEditor editor, EvaluationContext context, Javadoc javadoc,
        String tagName, String expectedName) throws Exception {
    if (javadoc != null) {
        for (TagElement tag : DomGenerics.tags(javadoc)) {
            if (tagName.equals(tag.getTagName())) {
                // extract <name> and <expression text>
                String name;
                String expressionText;
                {
                    String errorMessage = "'" + tagName + " <name> = <expression>' expected but '" + tag
                            + "' found.";
                    Assert.isLegal(tag.fragments().size() == 1, errorMessage);
                    // prepare TextElement parts
                    TextElement textElement = (TextElement) tag.fragments().get(0);
                    String text = textElement.getText().trim();
                    String[] parts = StringUtils.split(text);
                    Assert.isLegal(parts.length >= 2, errorMessage);
                    // assign parts
                    name = parts[0];
                    expressionText = text.substring(name.length()).trim();
                }
                // check that we found expected <name>
                if (name.equals(expectedName)) {
                    Object value = tag.getProperty(KEY_EXPRESSION_VALUE);
                    // evaluate value only one time
                    if (value == null) {
                        Expression expression = editor.getParser().parseExpression(javadoc.getStartPosition(),
                                expressionText);
                        value = AstEvaluationEngine.evaluate(context, expression);
                        tag.setProperty(KEY_EXPRESSION_VALUE, value);
                    }
                    // return value
                    return value;
                }
            }
        }
    }
    // no value found 
    return AstEvaluationEngine.UNKNOWN;
}

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