com.github.datalking.web.mvc.condition.AbstractNameValueExpression Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of play-mvc Show documentation
simple mvc framework based on java servlet.
The newest version!
package com.github.datalking.web.mvc.condition;

import javax.servlet.http.HttpServletRequest;

/**
 * @author yaoo on 4/28/18
 */
public abstract class AbstractNameValueExpression implements NameValueExpression {

    protected final String name;

    protected final T value;

    protected final boolean isNegated;

    AbstractNameValueExpression(String expression) {
        int separator = expression.indexOf('=');
        if (separator == -1) {
            this.isNegated = expression.startsWith("!");
            this.name = isNegated ? expression.substring(1) : expression;
            this.value = null;
        } else {
            this.isNegated = (separator > 0) && (expression.charAt(separator - 1) == '!');
            this.name = isNegated ? expression.substring(0, separator - 1) : expression.substring(0, separator);
            this.value = parseValue(expression.substring(separator + 1));
        }
    }

    public String getName() {
        return this.name;
    }

    public T getValue() {
        return this.value;
    }

    public boolean isNegated() {
        return this.isNegated;
    }

    protected abstract T parseValue(String valueExpression);

    public final boolean match(HttpServletRequest request) {
        boolean isMatch;
        if (this.value != null) {
            isMatch = matchValue(request);
        } else {
            isMatch = matchName(request);
        }
        return isNegated ? !isMatch : isMatch;
    }

    protected abstract boolean matchName(HttpServletRequest request);

    protected abstract boolean matchValue(HttpServletRequest request);

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj != null && obj instanceof AbstractNameValueExpression) {
            AbstractNameValueExpression other = (AbstractNameValueExpression) obj;
            return ((this.name.equalsIgnoreCase(other.name)) &&
                    (this.value != null ? this.value.equals(other.value) : other.value == null) &&
                    this.isNegated == other.isNegated);
        }
        return false;
    }

    @Override
    public int hashCode() {
        int result = name.hashCode();
        result = 31 * result + (value != null ? value.hashCode() : 0);
        result = 31 * result + (isNegated ? 1 : 0);
        return result;
    }

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();
        if (value != null) {
            builder.append(name);
            if (isNegated) {
                builder.append('!');
            }
            builder.append('=');
            builder.append(value);
        } else {
            if (isNegated) {
                builder.append('!');
            }
            builder.append(name);
        }
        return builder.toString();
    }
}