com.github.houbb.valid.jsr.constraint.NotNullConstraint Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of valid-jsr Show documentation

The jsr-303 module for valid framework.

There is a newer version: 0.3.0

package com.github.houbb.valid.jsr.constraint;

import com.github.houbb.heaven.annotation.ThreadSafe;
import com.github.houbb.heaven.util.lang.ObjectUtil;
import com.github.houbb.valid.api.api.constraint.IConstraint;
import com.github.houbb.valid.api.api.constraint.IConstraintContext;
import com.github.houbb.valid.core.api.constraint.AbstractStrictConstraint;

/**
 * 不可为 null 约束
 * @author binbin.hou
 * @since 0.0.2
 */
@ThreadSafe
class NotNullConstraint extends AbstractStrictConstraint {

    /**
     * 唯一实例
     * @since 0.0.3
     */
    private static final IConstraint INSTANCE = new NotNullConstraint();

    /**
     * 获取单例示例
     * @return 示例
     * @since 0.0.3
     */
    static IConstraint getInstance() {
        return INSTANCE;
    }

    @Override
    protected boolean pass(final IConstraintContext context, final Object value) {
        return ObjectUtil.isNotNull(value);
    }

    @Override
    protected String expectValue(final IConstraintContext context) {
        return "not null";
    }

}