Groovy example source code file (ClosureExpression.java)

This example Groovy source code file (ClosureExpression.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

closureexpression, closureexpression, expression, override, parameter, parameter, statement, statement, string, string, variablescope

The Groovy ClosureExpression.java source code

/*
 * Copyright 2003-2010 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 org.codehaus.groovy.ast.*;
import org.codehaus.groovy.ast.stmt.Statement;
import org.codehaus.groovy.runtime.InvokerHelper;

/**
 * Represents a closure expression such as { statement }
 * or { i -> statement } or { i, x, String y ->  statement }
 * 
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @author Hamlet D'Arcy
 * @version $Revision: 21895 $
 */
public class ClosureExpression extends Expression {
    
    private Parameter[] parameters;
    private Statement code;
    private VariableScope variableScope;
    
    public ClosureExpression(Parameter[] parameters, Statement code) {
        this.parameters = parameters;
        this.code = code;
        super.setType(ClassHelper.CLOSURE_TYPE);
    }
    
    public void visit(GroovyCodeVisitor visitor) {
        visitor.visitClosureExpression(this);
    }

    public Expression transformExpression(ExpressionTransformer transformer) {
        return this;
    }
    
    public String toString() {
        return super.toString() + InvokerHelper.toString(parameters) + "{ " + code + " }";
    }

    /**
     * This gets the code statement of the closure. You can read this method to find out what actions
     * the closure is going to perform.
     *
     * @return the code statement of the closure
     */
    public Statement getCode() {
        return code;
    }

    /**
     * This sets the code statement of the closure. You can use this method in order to add more actions
     * during the closure execution.
     *
     * @param code the new Statement
     */
    public void setCode(Statement code) {
        this.code = code;
    }

    public Parameter[] getParameters() {
        return parameters;
    }

    public boolean isParameterSpecified() {
        return parameters != null && parameters.length > 0;
    }
    
    public VariableScope getVariableScope() {
        return variableScope;
    }

    public void setVariableScope(VariableScope variableScope) {
        this.variableScope = variableScope;
    }

    @Override
    public String getText() {
        String paramText = AstToTextHelper.getParametersText(parameters);
        if (paramText.length() > 0) {
            return "{ " + paramText + " -> ... }";
        } else {
            return "{ -> ... }";
        }
    }
}