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

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Here is the source code for org.springframework.data.rest.webmvc.json.patch.TestOperation.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 lombok.AccessLevel;
import lombok.RequiredArgsConstructor;

import java.math.BigDecimal;
import java.math.BigInteger;

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

/**
 * <p>
 * Operation to test values on a given target.
 * </p>
 * <p>
 * If the value given matches the value given at the path, the operation completes as a no-op. On the other hand, if the
 * values do not match or if there are any errors interpreting the path, a {@link PatchException} will be thrown.
 * </p>
 *
 * @author Craig Walls
 * @author Oliver Gierke
 */
class TestOperation extends PatchOperation {

    /**
     * Constructs the test operation
     *
     * @param path The path to test. (e.g., '/foo/bar/4')
     * @param value The value to test the path against.
     */
    private TestOperation(UntypedSpelPath path, Object value) {
        super("test", path, value);
    }

    public static TestOperationBuilder whetherValueAt(String path) {
        return new TestOperationBuilder(path);
    }

    @RequiredArgsConstructor(access = AccessLevel.PRIVATE)
    static class TestOperationBuilder {

        private final String path;

        public TestOperation hasValue(Object value) {
            return new TestOperation(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 target, Class<?> type) {

        Object expected = normalizeIfNumber(evaluateValueFromTarget(target, type));
        Object actual = normalizeIfNumber(path.bindTo(type).getValue(target));

        if (!ObjectUtils.nullSafeEquals(expected, actual)) {
            throw new PatchException("Test against path '" + path + "' failed.");
        }
    }

    private static Object normalizeIfNumber(Object expected) {

        if (expected instanceof Double || expected instanceof Float) {
            expected = BigDecimal.valueOf(((Number) expected).doubleValue());
        } else if (expected instanceof Number) {
            expected = BigInteger.valueOf(((Number) expected).longValue());
        }

        return expected;
    }
}