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Google App Engine compliant variation of FreeMarker. FreeMarker is a "template engine"; a generic tool to generate text output based on templates.

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/*
 * Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
 * 
 * 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 freemarker.core;

import freemarker.template.TemplateException;
import freemarker.template.TemplateModel;

/**
 * A reference to a top-level variable
 */
final class Identifier extends Expression {

    private final String name;

    Identifier(String name) {
        this.name = name;
    }

    TemplateModel _eval(Environment env) throws TemplateException {
        try {
            return env.getVariable(name);
        } catch (NullPointerException e) {
            if (env == null) {
                throw new _MiscTemplateException(new Object[] {
                        "Variables are not available (certainly you are in a parse-time executed directive). "
                        + "The name of the variable you tried to read: ", name });
            } else {
                throw e;
            }
        }
    }

    public String toString() {
        return name;
    }

    public String getCanonicalForm() {
        return name;
    }
    
    String getName() {
        return name;
    }
    
    String getNodeTypeSymbol() {
        return getCanonicalForm();
    }

    boolean isLiteral() {
        return false;
    }
    
    int getParameterCount() {
        return 0;
    }

    Object getParameterValue(int idx) {
        throw new IndexOutOfBoundsException();
    }

    ParameterRole getParameterRole(int idx) {
        throw new IndexOutOfBoundsException();
    }

    protected Expression deepCloneWithIdentifierReplaced_inner(
            String replacedIdentifier, Expression replacement, ReplacemenetState replacementState) {
        if(this.name.equals(replacedIdentifier)) {
            if (replacementState.replacementAlreadyInUse) {
                Expression clone = replacement.deepCloneWithIdentifierReplaced(null, null, replacementState);
                clone.copyLocationFrom(replacement);
                return clone;
            } else {
                replacementState.replacementAlreadyInUse = true;
                return replacement;
            }
        } else {
            return new Identifier(this.name);
        }
    }

}