com.addthis.bundle.util.ConstantTypedField.java Source code

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Here is the source code for com.addthis.bundle.util.ConstantTypedField.java

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/*
 * 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.addthis.bundle.util;

import javax.annotation.Nullable;

import java.util.function.Supplier;

import com.addthis.bundle.core.Bundle;

import com.google.common.base.Objects;

import com.fasterxml.jackson.annotation.JsonCreator;

public class ConstantTypedField<T> implements TypedField<T>, Supplier<T> {
    private final T value;

    @JsonCreator
    public ConstantTypedField(T value) {
        this.value = value;
    }

    @Nullable
    @Override
    public T getValue(Bundle bundle) {
        return value;
    }

    @Override
    public void setValue(Bundle bundle, @Nullable T value) {
        throw new UnsupportedOperationException("cannot meaningfully change a static constant");
    }

    @Override
    public void removeValue(Bundle bundle) {
        throw new UnsupportedOperationException("cannot meaningfully delete a static constant");
    }

    @Override
    public String toString() {
        return Objects.toStringHelper(this).add("value", value).toString();
    }

    @Override
    public T get() {
        return value;
    }
}