/*
 * 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.bval.jsr.descriptor;

import java.lang.reflect.AnnotatedType;
import java.util.stream.Stream;

import javax.validation.ConstraintDeclarationException;
import javax.validation.metadata.ContainerElementTypeDescriptor;
import javax.validation.valueextraction.ValueExtractor;

import org.apache.bval.jsr.GraphContext;
import org.apache.bval.jsr.metadata.ContainerElementKey;
import org.apache.bval.jsr.valueextraction.ExtractValues;
import org.apache.bval.util.Exceptions;
import org.apache.bval.util.Validate;

public class ContainerElementTypeD extends CascadableContainerD<CascadableContainerD<?, ?>, AnnotatedType>
    implements ContainerElementTypeDescriptor {

    private final ContainerElementKey key;

    ContainerElementTypeD(ContainerElementKey key, MetadataReader.ForContainer<AnnotatedType> reader,
        CascadableContainerD<?, ?> parent) {
        super(reader, parent);
        this.key = Validate.notNull(key, "key");
    }

    @Override
    public Class<?> getContainerClass() {
        return key.getContainerClass();
    }

    @Override
    public Integer getTypeArgumentIndex() {
        return Integer.valueOf(key.getTypeArgumentIndex());
    }

    public ContainerElementKey getKey() {
        return key;
    }

    @Override
    protected Stream<GraphContext> readImpl(GraphContext context) throws Exception {
        final ValueExtractor<?> valueExtractor = context.getValidatorContext().getValueExtractors().find(key);
        Exceptions.raiseIf(valueExtractor == null, ConstraintDeclarationException::new, "No %s found for %s",
            ValueExtractor.class.getSimpleName(), key);

        return ExtractValues.extract(context, key, valueExtractor).stream();
    }
}