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Java port of Stefan Goessner JsonPath.

There is a newer version: 2.9.0

/*
 * Copyright 2011 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 com.jayway.jsonpath.internal.spi.mapper;

import com.jayway.jsonpath.spi.mapper.MappingException;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

public abstract class MapperBase implements Mapper {

    private final Set convertiblePairs = new HashSet();

    protected void register(Class srcType, Class targetType){
        convertiblePairs.add(new ConvertiblePair(srcType, targetType));
    }

    @Override
    public Set getConvertibleTypes() {
        return Collections.unmodifiableSet(convertiblePairs);
    }

    void assertValidConversion(Object src, Class srcType, Class targetType) {

        if (src == null) {
            return;
        }

        if (!srcType.isAssignableFrom(src.getClass())) {
            throw new MappingException("Source: " + src.getClass() + " is not assignable from: " + srcType.getName());
        }
        if(!canConvert(srcType, targetType)){
            throw new MappingException("Can not map: " + srcType.getName() + " to: " + targetType.getName());
        }
    }

    boolean canConvert(Class srcType, Class targetType){
        return convertiblePairs.contains(new Mapper.ConvertiblePair(srcType, targetType));
    }
}