org.springframework.data.rest.webmvc.json.patch.AddOperation.java Source code

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Here is the source code for org.springframework.data.rest.webmvc.json.patch.AddOperation.java

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/*
 * Copyright 2014-2019 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
 *
 *      https://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.springframework.data.rest.webmvc.json.patch;

import org.springframework.data.rest.webmvc.json.patch.SpelPath.UntypedSpelPath;

/**
 * Operation to add a new value to the given "path". Will throw a {@link PatchException} if the path is invalid or if
 * the given value is not assignable to the given path.
 *
 * @author Craig Walls
 * @author Oliver Gierke
 */
class AddOperation extends PatchOperation {

    /**
     * Constructs the add operation
     *
     * @param path The path where the value will be added. (e.g., '/foo/bar/4')
     * @param value The value to add.
     */
    private AddOperation(UntypedSpelPath path, Object value) {
        super("add", path, value);
    }

    public static AddOperation of(String path, Object value) {
        return new AddOperation(SpelPath.untyped(path), value);
    }

    /*
     * (non-Javadoc)
     * @see org.springframework.data.rest.webmvc.json.patch.PatchOperation#perform(java.lang.Object, java.lang.Class)
     */
    @Override
    void perform(Object targetObject, Class<?> type) {
        path.bindTo(type).addValue(targetObject, evaluateValueFromTarget(targetObject, type));
    }

    /*
     * (non-Javadoc)
     * @see org.springframework.data.rest.webmvc.json.patch.PatchOperation#evaluateValueFromTarget(java.lang.Object, java.lang.Class)
     */
    @Override
    protected Object evaluateValueFromTarget(Object targetObject, Class<?> entityType) {

        if (!path.isAppend()) {
            return super.evaluateValueFromTarget(targetObject, entityType);
        }

        return evaluate(path.bindTo(entityType).getLeafType());
    }
}