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Groovy example source code file (PropertyExpression.java)

This example Groovy source code file (PropertyExpression.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

constantexpression, constantexpression, expression, expression, propertyexpression, propertyexpression, string, string

The Groovy PropertyExpression.java source code

/*
 * 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 org.codehaus.groovy.ast.GroovyCodeVisitor;

/**
 * Represents a property access such as the expression "foo.bar".
 * 
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @version $Revision: 21431 $
 */
public class PropertyExpression extends Expression {

    private Expression objectExpression;
    private Expression property;
    private boolean spreadSafe = false;
    private boolean safe = false;
    private boolean isStatic = false;

    private boolean implicitThis = false;

    public boolean isStatic() {
        return isStatic;
    }

    public PropertyExpression(Expression objectExpression, String property) {
        this(objectExpression, new ConstantExpression(property), false);
    }
    
    public PropertyExpression(Expression objectExpression, Expression property) {
        this(objectExpression, property, false);
    }

    public PropertyExpression(Expression objectExpression, Expression property, boolean safe) {
        this.objectExpression = objectExpression;
        this.property = property;
        this.safe = safe;
    }

    public void visit(GroovyCodeVisitor visitor) {
        visitor.visitPropertyExpression(this);
    }

    public boolean isDynamic() {
        return true;
    }

    public Expression transformExpression(ExpressionTransformer transformer) {
        PropertyExpression ret = new PropertyExpression(transformer.transform(objectExpression),
                transformer.transform(property), safe);
        ret.setSpreadSafe(spreadSafe);
        ret.setStatic(isStatic);
        ret.setImplicitThis(implicitThis);
        ret.setSourcePosition(this);
        return ret;
    }

    public Expression getObjectExpression() {
        return objectExpression;
    }

    public void setObjectExpression(Expression exp) {
        objectExpression=exp;
    }    
    
    public Expression getProperty() {
        return property;
    }
    
    public String getPropertyAsString() {
        if (property==null) return null;
        if (! (property instanceof ConstantExpression)) return null;
        ConstantExpression constant = (ConstantExpression) property;
        return constant.getText();
    }

    public String getText() {
        String object = objectExpression.getText();
        String text = property.getText();
        String spread = isSpreadSafe() ? "*" : "";
        String safe = isSafe() ? "?" : "";
        return object + spread + safe + "." + text;
    }

    /**
     * @return is this a safe navigation, i.e. if true then if the source object is null
     * then this navigation will return null
     */
    public boolean isSafe() {
        return safe;
    }

    public boolean isSpreadSafe() {
        return spreadSafe;
    }

    public void setSpreadSafe(boolean value) {
        spreadSafe = value;
    }

    public String toString() {
        return super.toString() + "[object: " + objectExpression + " property: " + property + "]";
    }

    public void setStatic(boolean aStatic) {
        this.isStatic = aStatic;
    }
    
    public boolean isImplicitThis(){
        return implicitThis;
    }
    
    public void setImplicitThis(boolean it) {
        implicitThis  = it;
    }
}

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