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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 java.util.List;

import org.javarosa.core.model.condition.EvaluationContext;
import org.javarosa.core.model.condition.pivot.UnpivotableExpressionException;
import org.javarosa.core.model.instance.DataInstance;
import org.javarosa.core.util.externalizable.ExtUtil;
import org.javarosa.core.util.externalizable.ExtWrapTagged;
import org.javarosa.core.util.externalizable.PrototypeFactory;
import org.javarosa.core.util.externalizable.DeserializationException;

public abstract class XPathBinaryOpExpr extends XPathOpExpr {
    public XPathExpression a, b;

    public XPathBinaryOpExpr () { } //for deserialization of children

    public XPathBinaryOpExpr (XPathExpression a, XPathExpression b) {
        this.a = a;
        this.b = b;
    }

    public String toString (String op) {
        return "{binop-expr:" + op + "," + a.toString() + "," + b.toString() + "}";
    }

    public boolean equals (Object o) {
        if (o instanceof XPathBinaryOpExpr) {
            XPathBinaryOpExpr x = (XPathBinaryOpExpr)o;
            return a.equals(x.a) && b.equals(x.b);
        } else {
            return false;
        }
    }

    public void readExternal(DataInputStream in, PrototypeFactory pf) throws IOException, DeserializationException {
        a = (XPathExpression)ExtUtil.read(in, new ExtWrapTagged(), pf);
        b = (XPathExpression)ExtUtil.read(in, new ExtWrapTagged(), pf);
    }

    public void writeExternal(DataOutputStream out) throws IOException {
        ExtUtil.write(out, new ExtWrapTagged(a));
        ExtUtil.write(out, new ExtWrapTagged(b));
    }

    public Object pivot (DataInstance model, EvaluationContext evalContext, List