org.javarosa.xpath.expr.XPathNumericLiteral Maven / Gradle / Ivy

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A Java library for rendering forms that are compliant with ODK XForms spec
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/*
 * Copyright (C) 2009 JavaRosa
 *
 * 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 org.javarosa.xpath.expr;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import org.javarosa.core.model.condition.EvaluationContext;
import org.javarosa.core.model.instance.DataInstance;
import org.javarosa.core.util.externalizable.DeserializationException;
import org.javarosa.core.util.externalizable.ExtUtil;
import org.javarosa.core.util.externalizable.PrototypeFactory;
import org.jetbrains.annotations.NotNull;

public class XPathNumericLiteral extends XPathExpression {
    public double d;

    public XPathNumericLiteral () { } //for deserialization

    public XPathNumericLiteral (Double d) {
        this.d = d.doubleValue();
    }

    public Object eval (DataInstance model, EvaluationContext evalContext) {
        return new Double(d);
    }

    @Override
    public boolean isIdempotent() {
        return true;
    }

    @Override
    public boolean containsFunc(@NotNull String name) {
        return false;
    }

    public String toString () {
        return "{num:" + Double.toString(d) + "}";
    }

    public boolean equals (Object o) {
        if (o instanceof XPathNumericLiteral) {
            XPathNumericLiteral x = (XPathNumericLiteral)o;
            return (Double.isNaN(d) ? Double.isNaN(x.d) : d == x.d);
        } else {
            return false;
        }
    }

    public void readExternal(DataInputStream in, PrototypeFactory pf) throws IOException, DeserializationException {
        if (in.readByte() == (byte)0x00) {
            d = ExtUtil.readNumeric(in);
        } else {
            d = ExtUtil.readDecimal(in);
        }
    }

    public void writeExternal(DataOutputStream out) throws IOException {
        if (d == (int)d) {
            out.writeByte(0x00);
            ExtUtil.writeNumeric(out, (int)d);
        } else {
            out.writeByte(0x01);
            ExtUtil.writeDecimal(out, d);
        }
    }
}