/
CompositeStringExpression.java
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/
CompositeStringExpression.java
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/*
* Copyright 2004-2012 the original author or authors.
*
* 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.springframework.binding.expression.support;
import org.springframework.binding.expression.EvaluationException;
import org.springframework.binding.expression.Expression;
import org.springframework.core.style.ToStringCreator;
/**
* Evaluates an array of expressions to build a concatenated string.
*
* @author Keith Donald
*/
public class CompositeStringExpression implements Expression {
/**
* The expression array.
*/
private Expression[] expressions;
/**
* Creates a new composite string expression.
* @param expressions the ordered set of expressions that when evaluated will have their results stringed together
* to build the composite string
*/
public CompositeStringExpression(Expression... expressions) {
this.expressions = expressions;
}
public Object getValue(Object context) throws EvaluationException {
StringBuilder value = new StringBuilder(128);
for (Expression expression : expressions) {
value.append(expression.getValue(context));
}
return value.toString();
}
public void setValue(Object context, Object value) throws EvaluationException {
throw new UnsupportedOperationException("Cannot set a composite string expression value");
}
public Class<?> getValueType(Object context) {
return String.class;
}
public String getExpressionString() {
return null;
}
public String toString() {
return new ToStringCreator(this).append("expressions", expressions).toString();
}
}