/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.apache.tools.ant.taskdefs.condition;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.ProjectComponent;
import org.apache.tools.ant.types.Reference;

/**
 * Condition that tests whether a given reference has been defined.
 *
 * <p>Optionally tests whether it is of a given type/class.</p>
 *
 * @since Ant 1.6
 */
public class IsReference extends ProjectComponent implements Condition {
    private Reference ref;
    private String type;

    /**
     * Set the refid attribute.
     *
     * @param r a Reference value
     */
    public void setRefid(Reference r) {
        ref = r;
    }

    /**
     * Set the type attribute. This is optional attribute.
     *
     * @param type an ant component type name
     */
    public void setType(String type) {
        this.type = type;
    }

    /**
     * @return true if the reference exists and if type is set, if
     *              the reference is the same type
     * @exception BuildException if an error occurs
     */
    @Override
    public boolean eval() throws BuildException {
        if (ref == null) {
            throw new BuildException(
                    "No reference specified for isreference condition");
        }

        String key = ref.getRefId();
        if (!getProject().hasReference(key)) {
            return false;
        }

        if (type == null) {
            return true;
        }
        Class<?> typeClass = getProject().getDataTypeDefinitions().get(type);
        if (typeClass == null) {
            typeClass = getProject().getTaskDefinitions().get(type);
        }

        // if the type is unknown, throw exception instead?
        return typeClass != null
                && typeClass.isAssignableFrom(getProject().getReference(key).getClass());

    }

}
