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Groovy example source code file (ArrayExpression.java)

This example Groovy source code file (ArrayExpression.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

arrayexpression, arrayexpression, classcastexception, classnode, classnode, expression, expression, item, list, list, object, string, stringbuffer, util

The Groovy ArrayExpression.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 java.util.Collections;
import java.util.List;

import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.GroovyCodeVisitor;

/**
 * Represents an array object construction either using a fixed size
 * or an initializer expression
 *
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @version $Revision: 20590 $
 */
public class ArrayExpression extends Expression {
    private List<Expression> expressions;
    private List<Expression> sizeExpression;

    private ClassNode elementType;

    private static ClassNode makeArray(ClassNode base, List<Expression> sizeExpression) {
        ClassNode ret = base.makeArray();
        if (sizeExpression == null) return ret;
        int size = sizeExpression.size();
        for (int i = 1; i < size; i++) {
            ret = ret.makeArray();
        }
        return ret;
    }

    public ArrayExpression(ClassNode elementType, List<Expression> expressions, List sizeExpression) {
        //expect to get the elementType
        super.setType(makeArray(elementType, sizeExpression));
        if (expressions == null) expressions = Collections.emptyList();
        this.elementType = elementType;
        this.expressions = expressions;
        this.sizeExpression = sizeExpression;

        for (Object item : expressions) {
            if (item != null && !(item instanceof Expression)) {
                throw new ClassCastException("Item: " + item + " is not an Expression");
            }
        }
        if (sizeExpression != null) {
            for (Object item : sizeExpression) {
                if (!(item instanceof Expression)) {
                    throw new ClassCastException("Item: " + item + " is not an Expression");
                }
            }
        }
    }


    /**
     * Creates an array using an initializer expression
     */
    public ArrayExpression(ClassNode elementType, List<Expression> expressions) {
        this(elementType, expressions, null);
    }

    public void addExpression(Expression expression) {
        expressions.add(expression);
    }

    public List<Expression> getExpressions() {
        return expressions;
    }

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

    public boolean isDynamic() {
        return false;
    }

    public Expression transformExpression(ExpressionTransformer transformer) {
        List<Expression> exprList = transformExpressions(expressions, transformer);
        List<Expression> sizes = null;
        if (sizeExpression != null) sizes = transformExpressions(sizeExpression, transformer);
        Expression ret = new ArrayExpression(elementType, exprList, sizes);
        ret.setSourcePosition(this);
        return ret;
    }

    public Expression getExpression(int i) {
        return expressions.get(i);
    }

    public ClassNode getElementType() {
        return elementType;
    }

    public String getText() {
        StringBuffer buffer = new StringBuffer("[");
        boolean first = true;
        for (Expression expression : expressions) {
            if (first) {
                first = false;
            } else {
                buffer.append(", ");
            }

            buffer.append(expression.getText());
        }
        buffer.append("]");
        return buffer.toString();
    }

    public List<Expression> getSizeExpression() {
        return sizeExpression;
    }

    public String toString() {
        return super.toString() + expressions;
    }
}

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