la.alsocan.jsonshapeshifter.bindings.AbstractNodeBinding.java Source code

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Here is the source code for la.alsocan.jsonshapeshifter.bindings.AbstractNodeBinding.java

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/*
 * The MIT License
 *
 * Copyright 2014 Florian Poulin - https://github.com/fpoulin.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package la.alsocan.jsonshapeshifter.bindings;

import com.fasterxml.jackson.databind.JsonNode;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import la.alsocan.jsonshapeshifter.schemas.SchemaNode;

/**
 * @author Florian Poulin - https://github.com/fpoulin
 * @param <T> Type of value for the node binding
 */
public abstract class AbstractNodeBinding<T> extends Binding<T> {

    private final SchemaNode source;

    public AbstractNodeBinding(SchemaNode source) {
        this.source = source;
        if (source == null) {
            throw new IllegalBindingException();
        }
    }

    @Override
    public Set<SchemaNode> getSourceNodes() {
        Set<SchemaNode> nodes = new HashSet<>();
        nodes.add(source);
        return nodes;
    }

    @Override
    public final T getValue(JsonNode payload, List<Integer> context) {
        JsonNode node = payload.at(jsonPointer(source.getSchemaPointer(), context));
        return node == null ? null : readValue(node);
    }

    protected abstract T readValue(JsonNode node);

    private static final String PATH_DELIMITER_REGEX = "\\{i\\}";

    static String jsonPointer(String schemaPointer, List<Integer> context) {
        for (Integer index : context) {
            schemaPointer = schemaPointer.replaceFirst(PATH_DELIMITER_REGEX, String.valueOf(index));
        }
        return schemaPointer;
    }
}